diff --git a/.rubocop.yml b/.rubocop.yml
index 152ea112..d966a685 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -25,8 +25,7 @@ Documentation:
 Encoding:
   Enabled: false
 HashSyntax:
-  # EnforcedStyle: ruby19
-  Enabled: false
+  EnforcedStyle: ruby19
 SpaceAroundEqualsInParameterDefault:
   EnforcedStyle: no_space
 Blocks:
diff --git a/Gemfile b/Gemfile
index 2f4e97a3..4c721ffa 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,8 +1,8 @@
 source 'https://rubygems.org'
 
 # Build and doc tools
-gem 'rake',     '~> 10.0.3', :require => false
-gem 'yard',     '~> 0.8.0', :require => false
+gem 'rake',     '~> 10.0.3', require: false
+gem 'yard',     '~> 0.8.0', require: false
 
 # Test tools
 gem 'cucumber', '~> 1.3.1'
@@ -12,17 +12,17 @@ gem 'rspec',    '~> 2.12'
 gem 'simplecov'
 
 # Optional middleman dependencies, included for tests
-gem 'sinatra', :require => false
-gem 'slim', :require => false
-gem 'liquid', :require => false
-gem 'less', '~> 2.3.0', :require => false
-gem 'stylus', :require => false
-gem 'asciidoctor', :require => false
+gem 'sinatra', require: false
+gem 'slim', require: false
+gem 'liquid', require: false
+gem 'less', '~> 2.3.0', require: false
+gem 'stylus', require: false
+gem 'asciidoctor', require: false
 
 platforms :ruby do
   gem 'therubyracer'
   gem 'redcarpet', '~> 3.1'
-  gem 'pry', :require => false, :group => :development
+  gem 'pry', require: false, group: :development
 end
 
 platforms :jruby do
@@ -30,10 +30,10 @@ platforms :jruby do
 end
 
 # Code Quality
-gem 'coveralls', :require => false
-gem 'rubocop', :require => false
+gem 'coveralls', require: false
+gem 'rubocop', require: false
 
 # Middleman itself
-gem 'middleman-core', :path => 'middleman-core'
-gem 'middleman-sprockets', :github => 'middleman/middleman-sprockets'
-gem 'middleman', :path => 'middleman'
+gem 'middleman-core', path: 'middleman-core'
+gem 'middleman-sprockets', github: 'middleman/middleman-sprockets'
+gem 'middleman', path: 'middleman'
diff --git a/Rakefile b/Rakefile
index efae9ae9..05da4ae9 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,5 +1,4 @@
-require 'rubygems'  unless defined?(Gem)
-# require 'fileutils' unless defined?(FileUtils)
+require 'rubygems' unless defined?(Gem)
 require 'rake'
 
 require File.expand_path('../middleman-core/lib/middleman-core/version.rb', __FILE__)
@@ -11,7 +10,7 @@ middleman_gems = %w(middleman-core middleman)
 GEM_PATHS = middleman_gems.freeze
 
 def sh_rake(command)
-  sh "#{Gem.ruby} -S rake #{command}", :verbose => true
+  sh "#{Gem.ruby} -S rake #{command}", verbose: true
 end
 
 desc 'Displays the current version'
@@ -19,19 +18,6 @@ task :version do
   puts "Current version: #{Middleman::VERSION}"
 end
 
-desc 'Bumps the version number based on given version'
-task :bump, [:version] do |_, args|
-  raise 'Please specify version=x.x.x !' unless args.version
-  version_path = File.dirname(__FILE__) + '/middleman-core/lib/middleman-core/version.rb'
-  version_text = File.read(version_path).sub(/VERSION = '[\d\.\w]+'/, "VERSION = '#{args.version}'")
-  puts "Updating Middleman to version #{args.version}"
-  File.open(version_path, 'w') { |f| f.write version_text }
-  sh 'git commit -a -m "Bumped version to %s"' % args.version
-end
-
-desc 'Executes a fresh install removing all middleman version and then reinstall all gems'
-task :fresh => [:uninstall, :install, :clean]
-
 desc 'Pushes repository to GitHub'
 task :push do
   puts 'Pushing to github...'
@@ -41,12 +27,11 @@ task :push do
 end
 
 desc 'Release all middleman gems'
-task :publish => :push do
+task publish: :push do
   puts 'Pushing to rubygems...'
   GEM_PATHS.each do |dir|
     Dir.chdir(dir) { sh_rake('release') }
   end
-  Rake::Task['clean'].invoke
 end
 
 desc 'Generate documentation for all middleman gems'
@@ -61,6 +46,7 @@ task :test do
   GEM_PATHS.each do |g|
     Dir.chdir("#{File.join(ROOT, g)}") { sh "#{Gem.ruby} -S rake test" }
   end
+  Rake::Task['rubocop'].invoke
 end
 
 desc 'Run specs for all middleman gems'
@@ -77,4 +63,4 @@ Rubocop::RakeTask.new(:rubocop) do |task|
 end
 
 desc 'Run tests for all middleman gems'
-task :default => :test
+task default: :test
diff --git a/gem_rake_helper.rb b/gem_rake_helper.rb
index 5dab239b..284cf5dc 100644
--- a/gem_rake_helper.rb
+++ b/gem_rake_helper.rb
@@ -38,8 +38,8 @@ RSpec::Core::RakeTask.new do |spec|
 end
 
 desc 'Run tests, both RSpec and Cucumber'
-task :test => [:spec, :cucumber]
+task test: [:spec, :cucumber]
 
 YARD::Rake::YardocTask.new
 
-task :default => :test
+task default: :test
diff --git a/middleman-core/lib/middleman-core.rb b/middleman-core/lib/middleman-core.rb
index 5d3dc485..41673aac 100644
--- a/middleman-core/lib/middleman-core.rb
+++ b/middleman-core/lib/middleman-core.rb
@@ -1,4 +1,5 @@
 # Setup our load paths
+# rubocop:disable FileName
 libdir = File.expand_path(File.dirname(__FILE__))
 $LOAD_PATH.unshift(libdir) unless $LOAD_PATH.include?(libdir)
 
diff --git a/middleman-core/lib/middleman-core/application.rb b/middleman-core/lib/middleman-core/application.rb
index 01027640..be87608a 100644
--- a/middleman-core/lib/middleman-core/application.rb
+++ b/middleman-core/lib/middleman-core/application.rb
@@ -52,20 +52,20 @@ module Middleman
       class_eval(&block)   if block_given?
       include(*extensions) if extensions.any?
     end
-    delegate :helpers, :to => :"self.class"
+    delegate :helpers, to: :"self.class"
 
     # Root project directory (overwritten in middleman build/server)
     # @return [String]
     def self.root
       ENV['MM_ROOT'] || Dir.pwd
     end
-    delegate :root, :to => :"self.class"
+    delegate :root, to: :"self.class"
 
     # Pathname-addressed root
     def self.root_path
       Pathname(root)
     end
-    delegate :root_path, :to => :"self.class"
+    delegate :root_path, to: :"self.class"
 
     # Name of the source directory
     # @return [String]
@@ -195,7 +195,7 @@ module Middleman
     def self.cache
       @_cache ||= ::Tilt::Cache.new
     end
-    delegate :cache, :to => :"self.class"
+    delegate :cache, to: :"self.class"
 
     # Whether we're in development mode
     # @return [Boolean] If we're in dev mode
@@ -216,7 +216,7 @@ module Middleman
       File.join(root, config[:source])
     end
 
-    delegate :instrument, :to => ::Middleman::Util
+    delegate :instrument, to: ::Middleman::Util
 
     # Work around this bug: http://bugs.ruby-lang.org/issues/4521
     # where Ruby will call to_s/inspect while printing exception
diff --git a/middleman-core/lib/middleman-core/cli.rb b/middleman-core/lib/middleman-core/cli.rb
index e086e8e6..5090351f 100644
--- a/middleman-core/lib/middleman-core/cli.rb
+++ b/middleman-core/lib/middleman-core/cli.rb
@@ -30,10 +30,11 @@ module Middleman
       # @param [Symbol, String, nil] meth
       # @param [Boolean] subcommand
       # @return [void]
+      # rubocop:disable UnusedMethodArgument
       def help(meth=nil, subcommand=false)
         if meth && !self.respond_to?(meth)
           klass, task = Thor::Util.find_class_and_task_by_namespace("#{meth}:#{meth}")
-          klass.start(['-h', task].compact, :shell => shell)
+          klass.start(['-h', task].compact, shell: shell)
         else
           list = []
           Thor::Util.thor_classes_in(Middleman::Cli).each do |thor_class|
@@ -42,7 +43,7 @@ module Middleman
           list.sort! { |a, b| a[0] <=> b[0] }
 
           shell.say 'Tasks:'
-          shell.print_table(list, :ident => 2, :truncate => true)
+          shell.print_table(list, ident: 2, truncate: true)
           shell.say
         end
       end
@@ -51,10 +52,7 @@ module Middleman
       # @param [Symbol] meth
       def method_missing(meth, *args)
         meth = meth.to_s
-
-        if self.class.map.key?(meth)
-          meth = self.class.map[meth]
-        end
+        meth = self.class.map[meth] if self.class.map.key?(meth)
 
         klass, task = Thor::Util.find_class_and_task_by_namespace("#{meth}:#{meth}")
 
@@ -71,7 +69,7 @@ module Middleman
           raise Thor::Error, "There's no '#{meth}' command for Middleman. Try 'middleman help' for a list of commands."
         else
           args.unshift(task) if task
-          klass.start(args, :shell => shell)
+          klass.start(args, shell: shell)
         end
       end
     end
diff --git a/middleman-core/lib/middleman-core/cli/build.rb b/middleman-core/lib/middleman-core/cli/build.rb
index 836f3139..1af54e5e 100644
--- a/middleman-core/lib/middleman-core/cli/build.rb
+++ b/middleman-core/lib/middleman-core/cli/build.rb
@@ -19,26 +19,26 @@ module Middleman::Cli
 
     desc 'build [options]', 'Builds the static site for deployment'
     method_option :clean,
-                  :type    => :boolean,
-                  :default => true,
-                  :desc    => 'Remove orphaned files from build (--no-clean to disable)'
+                  type: :boolean,
+                  default: true,
+                  desc: 'Remove orphaned files from build (--no-clean to disable)'
     method_option :glob,
-                  :type    => :string,
-                  :aliases => '-g',
-                  :default => nil,
-                  :desc    => 'Build a subset of the project'
+                  type: :string,
+                  aliases: '-g',
+                  default: nil,
+                  desc: 'Build a subset of the project'
     method_option :verbose,
-                  :type    => :boolean,
-                  :default => false,
-                  :desc    => 'Print debug messages'
+                  type: :boolean,
+                  default: false,
+                  desc: 'Print debug messages'
     method_option :instrument,
-                  :type    => :string,
-                  :default => false,
-                  :desc    => 'Print instrument messages'
+                  type: :string,
+                  default: false,
+                  desc: 'Print instrument messages'
     method_option :profile,
-                  :type    => :boolean,
-                  :default => false,
-                  :desc    => 'Generate profiling report for the build'
+                  type: :boolean,
+                  default: false,
+                  desc: 'Generate profiling report for the build'
 
     # Core build Thor command
     # @return [void]
@@ -135,11 +135,11 @@ module Middleman::Cli
     # @return [void]
     def clean!
       @to_clean.each do |f|
-        base.remove_file f, :force => true
+        base.remove_file f, force: true
       end
 
       Dir[@build_dir.join('**', '*')].select { |d| File.directory?(d) }.each do |d|
-        base.remove_file d, :force => true if directory_empty? d
+        base.remove_file d, force: true if directory_empty? d
       end
     end
 
@@ -273,7 +273,6 @@ module Middleman::Cli
       base.say_status :error, file_name, :red
       if base.debugging
         raise e
-        exit(1)
       elsif base.options['verbose']
         base.shell.say response, :red
       end
diff --git a/middleman-core/lib/middleman-core/cli/bundler.rb b/middleman-core/lib/middleman-core/cli/bundler.rb
index 73bbd326..3f025ef3 100644
--- a/middleman-core/lib/middleman-core/cli/bundler.rb
+++ b/middleman-core/lib/middleman-core/cli/bundler.rb
@@ -7,7 +7,7 @@ module Middleman::Cli
 
     namespace :bundle
 
-    desc 'bundle', 'Setup initial bundle', :hide => true
+    desc 'bundle', 'Setup initial bundle', hide: true
 
     # The setup task
     def bundle
diff --git a/middleman-core/lib/middleman-core/cli/console.rb b/middleman-core/lib/middleman-core/cli/console.rb
index 86b660da..56b9abd9 100644
--- a/middleman-core/lib/middleman-core/cli/console.rb
+++ b/middleman-core/lib/middleman-core/cli/console.rb
@@ -10,26 +10,24 @@ module Middleman::Cli
 
     desc 'console [options]', 'Start an interactive console in the context of your Middleman application'
     method_option :environment,
-                  :aliases => '-e',
-                  :default => ENV['MM_ENV'] || ENV['RACK_ENV'] || 'development',
-                  :desc    => 'The environment Middleman will run under'
+                  aliases: '-e',
+                  default: ENV['MM_ENV'] || ENV['RACK_ENV'] || 'development',
+                  desc: 'The environment Middleman will run under'
     method_option :verbose,
-                  :type    => :boolean,
-                  :default => false,
-                  :desc    => 'Print debug messages'
+                  type: :boolean,
+                  default: false,
+                  desc: 'Print debug messages'
     def console
       require 'middleman-core'
       require 'irb'
 
       opts = {
-        :environment => options['environment'],
-        :debug => options['verbose']
+        environment: options['environment'],
+        debug: options['verbose']
       }
 
       @app = ::Middleman::Application.server.inst do
-        if opts[:environment]
-          set :environment, opts[:environment].to_sym
-        end
+        set :environment, opts[:environment].to_sym if opts[:environment]
 
         ::Middleman::Logger.singleton(opts[:debug] ? 0 : 1, opts[:instrumenting] || false)
       end
diff --git a/middleman-core/lib/middleman-core/cli/extension.rb b/middleman-core/lib/middleman-core/cli/extension.rb
index b4c92d81..1065514f 100644
--- a/middleman-core/lib/middleman-core/cli/extension.rb
+++ b/middleman-core/lib/middleman-core/cli/extension.rb
@@ -9,7 +9,7 @@ module Middleman::Cli
     namespace :extension
 
     # Required path for the new project to be generated
-    argument :name, :type => :string
+    argument :name, type: :string
 
     # Template files are relative to this file
     # @return [String]
@@ -33,7 +33,7 @@ module Middleman::Cli
     end
 
     # Output a .gitignore file
-    class_option :git, :type => :boolean, :default => true
+    class_option :git, type: :boolean, default: true
 
     no_tasks {
       # Write a .gitignore file for project
diff --git a/middleman-core/lib/middleman-core/cli/init.rb b/middleman-core/lib/middleman-core/cli/init.rb
index e010c860..98782807 100644
--- a/middleman-core/lib/middleman-core/cli/init.rb
+++ b/middleman-core/lib/middleman-core/cli/init.rb
@@ -11,35 +11,35 @@ module Middleman::Cli
     desc 'init NAME [options]', 'Create new project NAME'
     available_templates = ::Middleman::Templates.registered.keys.join(', ')
     method_option 'template',
-                  :aliases => '-T',
-                  :default => 'default',
-                  :desc    => "Use a project template: #{available_templates}"
+                  aliases: '-T',
+                  default: 'default',
+                  desc: "Use a project template: #{available_templates}"
     method_option 'css_dir',
       # :default => "stylesheets",
-                  :desc    => 'The path to the css files'
+                  desc: 'The path to the css files'
     method_option 'js_dir',
       # :default => "javascripts",
-                  :desc    => 'The path to the javascript files'
+                  desc: 'The path to the javascript files'
     method_option 'images_dir',
       # :default => "images",
-                  :desc    => 'The path to the image files'
+                  desc: 'The path to the image files'
     method_option 'rack',
-                  :type    => :boolean,
-                  :default => false,
-                  :desc    => 'Include a config.ru file'
+                  type: :boolean,
+                  default: false,
+                  desc: 'Include a config.ru file'
     method_option 'skip-gemfile',
-                  :type    => :boolean,
-                  :default => false,
-                  :desc    => "Don't create a Gemfile"
+                  type: :boolean,
+                  default: false,
+                  desc: "Don't create a Gemfile"
     method_option 'skip-bundle',
-                  :type    => :boolean,
-                  :aliases => '-B',
-                  :default => false,
-                  :desc    => "Don't run bundle install"
+                  type: :boolean,
+                  aliases: '-B',
+                  default: false,
+                  desc: "Don't run bundle install"
     method_option 'skip-git',
-                  :type    => :boolean,
-                  :default => false,
-                  :desc    => 'Skip Git ignores and keeps'
+                  type: :boolean,
+                  default: false,
+                  desc: 'Skip Git ignores and keeps'
     # The init task
     # @param [String] name
     def init(name='.')
diff --git a/middleman-core/lib/middleman-core/cli/server.rb b/middleman-core/lib/middleman-core/cli/server.rb
index e41e0333..7a41f59e 100644
--- a/middleman-core/lib/middleman-core/cli/server.rb
+++ b/middleman-core/lib/middleman-core/cli/server.rb
@@ -8,47 +8,47 @@ module Middleman::Cli
 
     desc 'server [options]', 'Start the preview server'
     method_option :environment,
-                  :aliases => '-e',
-                  :default => ENV['MM_ENV'] || ENV['RACK_ENV'] || 'development',
-                  :desc    => 'The environment Middleman will run under'
+                  aliases: '-e',
+                  default: ENV['MM_ENV'] || ENV['RACK_ENV'] || 'development',
+                  desc: 'The environment Middleman will run under'
     method_option :host,
-                  :type    => :string,
-                  :aliases => '-h',
-                  :default => '0.0.0.0',
-                  :desc    => 'Bind to HOST address'
+                  type: :string,
+                  aliases: '-h',
+                  default: '0.0.0.0',
+                  desc: 'Bind to HOST address'
     method_option :port,
-                  :aliases => '-p',
-                  :default => '4567',
-                  :desc    => 'The port Middleman will listen on'
+                  aliases: '-p',
+                  default: '4567',
+                  desc: 'The port Middleman will listen on'
     method_option :verbose,
-                  :type    => :boolean,
-                  :default => false,
-                  :desc    => 'Print debug messages'
+                  type: :boolean,
+                  default: false,
+                  desc: 'Print debug messages'
     method_option :instrument,
-                  :type    => :string,
-                  :default => false,
-                  :desc    => 'Print instrument messages'
+                  type: :string,
+                  default: false,
+                  desc: 'Print instrument messages'
     method_option :disable_watcher,
-                  :type    => :boolean,
-                  :default => false,
-                  :desc    => 'Disable the file change and delete watcher process'
+                  type: :boolean,
+                  default: false,
+                  desc: 'Disable the file change and delete watcher process'
     method_option :profile,
-                  :type    => :boolean,
-                  :default => false,
-                  :desc    => 'Generate profiling report for server startup'
+                  type: :boolean,
+                  default: false,
+                  desc: 'Generate profiling report for server startup'
     method_option :reload_paths,
-                  :type    => :string,
-                  :default => false,
-                  :desc    => 'Additional paths to auto-reload when files change'
+                  type: :string,
+                  default: false,
+                  desc: 'Additional paths to auto-reload when files change'
     method_option :force_polling,
-                  :type    => :boolean,
-                  :default => false,
-                  :desc    => 'Force file watcher into polling mode'
+                  type: :boolean,
+                  default: false,
+                  desc: 'Force file watcher into polling mode'
     method_option :latency,
-                  :type    => :numeric,
-                  :aliases => '-l',
-                  :default => 0.25,
-                  :desc    => 'Set file watcher latency, in seconds'
+                  type: :numeric,
+                  aliases: '-l',
+                  default: 0.25,
+                  desc: 'Set file watcher latency, in seconds'
 
     # Start the server
     def server
@@ -63,15 +63,15 @@ module Middleman::Cli
       end
 
       params = {
-        :port              => options['port'],
-        :host              => options['host'],
-        :environment       => options['environment'],
-        :debug             => options['verbose'],
-        :instrumenting     => options['instrument'],
-        :disable_watcher   => options['disable_watcher'],
-        :reload_paths      => options['reload_paths'],
-        :force_polling     => options['force_polling'],
-        :latency           => options['latency']
+        port: options['port'],
+        host: options['host'],
+        environment: options['environment'],
+        debug: options['verbose'],
+        instrumenting: options['instrument'],
+        disable_watcher: options['disable_watcher'],
+        reload_paths: options['reload_paths'],
+        force_polling: options['force_polling'],
+        latency: options['latency']
       }
 
       puts '== The Middleman is loading'
diff --git a/middleman-core/lib/middleman-core/configuration.rb b/middleman-core/lib/middleman-core/configuration.rb
index 244b0603..6c227504 100644
--- a/middleman-core/lib/middleman-core/configuration.rb
+++ b/middleman-core/lib/middleman-core/configuration.rb
@@ -111,16 +111,17 @@ module Middleman
       # Get the value of a setting by key. Returns nil if there is no such setting.
       # @return [Object]
       def [](key)
-        setting = @settings[key]
-        setting ? setting.value : nil
+        setting_obj = setting(key)
+        setting_obj ? setting_obj.value : nil
       end
 
       # Set the value of a setting by key. Creates the setting if it doesn't exist.
       # @param [Symbol] key
       # @param [Object] val
+      # rubocop:disable UselessSetterCall
       def []=(key, val)
-        setting = @settings[key] || define_setting(key)
-        setting.value = val
+        setting_obj = setting(key) || define_setting(key)
+        setting_obj.value = val
       end
 
       # Allow configuration settings to be read and written via methods
@@ -227,6 +228,7 @@ module Middleman
       end
 
       # Whether or not there has been a value set beyond the default
+      # rubocop:disable TrivialAccessors
       def value_set?
         @value_set
       end
diff --git a/middleman-core/lib/middleman-core/core_extensions/data.rb b/middleman-core/lib/middleman-core/core_extensions/data.rb
index 5555962c..4f8a0e50 100644
--- a/middleman-core/lib/middleman-core/core_extensions/data.rb
+++ b/middleman-core/lib/middleman-core/core_extensions/data.rb
@@ -143,9 +143,6 @@ module Middleman
         def data_for_path(path)
           response = nil
 
-          @@local_sources ||= {}
-          @@callback_sources ||= {}
-
           if store.key?(path.to_s)
             response = store[path.to_s]
           elsif callbacks.key?(path.to_s)
@@ -164,10 +161,7 @@ module Middleman
             return @local_data[path.to_s]
           else
             result = data_for_path(path)
-
-            if result
-              return ::Middleman::Util.recursively_enhance(result)
-            end
+            return ::Middleman::Util.recursively_enhance(result) if result
           end
 
           super
@@ -187,11 +181,11 @@ module Middleman
           __send__(key) if key?(key)
         end
 
-        def has_key?(key)
-          @local_data.key?(key.to_s) || !!(data_for_path(key))
+        def key?(key)
+          @local_data.key?(key.to_s) || data_for_path(key)
         end
 
-        alias_method :key?, :has_key?
+        alias_method :has_key?, :key?
 
         # Convert all the data into a static hash
         #
diff --git a/middleman-core/lib/middleman-core/core_extensions/extensions.rb b/middleman-core/lib/middleman-core/core_extensions/extensions.rb
index 2e174d81..917f7f6c 100644
--- a/middleman-core/lib/middleman-core/core_extensions/extensions.rb
+++ b/middleman-core/lib/middleman-core/core_extensions/extensions.rb
@@ -48,7 +48,7 @@ module Middleman
 
           app.extend ClassMethods
           app.send :include, InstanceMethods
-          app.delegate :configure, :to => :"self.class"
+          app.delegate :configure, to: :"self.class"
         end
         alias_method :included, :registered
       end
@@ -95,6 +95,7 @@ module Middleman
         #
         # @param [Symbol, Module] ext Which extension to activate
         # @return [void]
+        # rubocop:disable BlockNesting
         def activate(ext, options={}, &block)
           ext_module = if ext.is_a?(Module)
             ext
diff --git a/middleman-core/lib/middleman-core/core_extensions/file_watcher.rb b/middleman-core/lib/middleman-core/core_extensions/file_watcher.rb
index fd618261..d13d6589 100644
--- a/middleman-core/lib/middleman-core/core_extensions/file_watcher.rb
+++ b/middleman-core/lib/middleman-core/core_extensions/file_watcher.rb
@@ -61,7 +61,7 @@ module Middleman
       class API
         attr_reader :app
         attr_reader :known_paths
-        delegate :logger, :to => :app
+        delegate :logger, to: :app
 
         # Initialize api and internal path cache
         def initialize(app)
diff --git a/middleman-core/lib/middleman-core/core_extensions/front_matter.rb b/middleman-core/lib/middleman-core/core_extensions/front_matter.rb
index 6d43c9c3..b9f09647 100644
--- a/middleman-core/lib/middleman-core/core_extensions/front_matter.rb
+++ b/middleman-core/lib/middleman-core/core_extensions/front_matter.rb
@@ -43,7 +43,7 @@ module Middleman::CoreExtensions
           data[opt] = fmdata[opt] unless fmdata[opt].nil?
         end
 
-        { :options => data, :page => ::Middleman::Util.recursively_enhance(fmdata).freeze }
+        { options: data, page: ::Middleman::Util.recursively_enhance(fmdata).freeze }
       end
     end
 
@@ -114,6 +114,7 @@ module Middleman::CoreExtensions
     end
 
     private
+
     # Parse YAML frontmatter out of a string
     # @param [String] content
     # @return [Array<Hash, String>]
diff --git a/middleman-core/lib/middleman-core/core_extensions/rendering.rb b/middleman-core/lib/middleman-core/core_extensions/rendering.rb
index d1db2cdb..f6737724 100644
--- a/middleman-core/lib/middleman-core/core_extensions/rendering.rb
+++ b/middleman-core/lib/middleman-core/core_extensions/rendering.rb
@@ -1,12 +1,12 @@
 # Shutup Tilt Warnings
 # @private
 class Tilt::Template
-  def warn(*args)
-    # Kernel.warn(*args)
+  def warn(*)
   end
 end
 
 # Rendering extension
+# rubocop:disable UnderscorePrefixedVariableName
 module Middleman
   module CoreExtensions
     module Rendering
@@ -402,6 +402,7 @@ module Middleman
         end
 
         # The currently rendering engine
+        # rubocop:disable TrivialAccessors
         # @return [Symbol, nil]
         def current_engine=(v)
           @_current_engine = v
@@ -427,7 +428,7 @@ module Middleman
               extension_class = ::Tilt[options[:preferred_engine]]
 
               # Get a list of extensions for a preferred engine
-              matched_exts = ::Tilt.mappings.select do |ext, engines|
+              matched_exts = ::Tilt.mappings.select do |_, engines|
                 engines.include? extension_class
               end.keys
 
diff --git a/middleman-core/lib/middleman-core/core_extensions/request.rb b/middleman-core/lib/middleman-core/core_extensions/request.rb
index a3bbe7b2..e78f0ffe 100644
--- a/middleman-core/lib/middleman-core/core_extensions/request.rb
+++ b/middleman-core/lib/middleman-core/core_extensions/request.rb
@@ -69,15 +69,15 @@ module Middleman
             app.use Rack::Lint
             app.use Rack::Head
 
-            Array(@middleware).each do |klass, options, block|
-              app.use(klass, *options, &block)
+            Array(@middleware).each do |klass, options, middleware_block|
+              app.use(klass, *options, &middleware_block)
             end
 
             inner_app = inst(&block)
             app.map('/') { run inner_app }
 
-            Array(@mappings).each do |path, block|
-              app.map(path, &block)
+            Array(@mappings).each do |path, map_block|
+              app.map(path, &map_block)
             end
 
             app
@@ -125,6 +125,7 @@ module Middleman
         # configuration can be included later without impacting
         # other classes and instances.
         #
+        # rubocop:disable ClassVars
         # @return [Class]
         def server(&block)
           @@servercounter ||= 0
@@ -165,13 +166,13 @@ module Middleman
         def current_path=(path)
           Thread.current[:current_path] = path
           Thread.current[:legacy_request] = ::Thor::CoreExt::HashWithIndifferentAccess.new(
-                                                                                             :path   => path,
-                                                                                             :params => req ? ::Thor::CoreExt::HashWithIndifferentAccess.new(req.params) : {}
+                                                                                             path: path,
+                                                                                             params: req ? ::Thor::CoreExt::HashWithIndifferentAccess.new(req.params) : {}
           )
         end
 
-        delegate :use, :to => :"self.class"
-        delegate :map, :to => :"self.class"
+        delegate :use, to: :"self.class"
+        delegate :map, to: :"self.class"
 
         # Rack request
         # @return [Rack::Request]
diff --git a/middleman-core/lib/middleman-core/core_extensions/routing.rb b/middleman-core/lib/middleman-core/core_extensions/routing.rb
index 15acbc39..e2328a02 100644
--- a/middleman-core/lib/middleman-core/core_extensions/routing.rb
+++ b/middleman-core/lib/middleman-core/core_extensions/routing.rb
@@ -39,7 +39,7 @@ module Middleman
 
           # Use the metadata loop for matching against paths at runtime
           sitemap.provides_metadata_for_path(url) do |_|
-            { :options => opts, :blocks => blocks }
+            { options: opts, blocks: blocks }
           end
 
           return
@@ -54,7 +54,8 @@ module Middleman
         # Setup proxy
         if target = opts.delete(:proxy)
           # TODO: deprecate proxy through page?
-          proxy(url, target, opts, &block) and return
+          proxy(url, target, opts, &block)
+          return
         elsif opts.delete(:ignore)
           # TODO: deprecate ignore through page?
           ignore(url)
@@ -62,7 +63,7 @@ module Middleman
 
         # Setup a metadata matcher for rendering those options
         sitemap.provides_metadata_for_path(url) do |_|
-          { :options => opts, :blocks => blocks }
+          { options: opts, blocks: blocks }
         end
       end
     end
diff --git a/middleman-core/lib/middleman-core/core_extensions/show_exceptions.rb b/middleman-core/lib/middleman-core/core_extensions/show_exceptions.rb
index f1060b32..5eba1c0a 100644
--- a/middleman-core/lib/middleman-core/core_extensions/show_exceptions.rb
+++ b/middleman-core/lib/middleman-core/core_extensions/show_exceptions.rb
@@ -16,9 +16,7 @@ module Middleman
           # When in dev
           app.configure :development do
             # Include middlemare
-            if config[:show_exceptions]
-              use ::Rack::ShowExceptions
-            end
+            use ::Rack::ShowExceptions if config[:show_exceptions]
           end
         end
       end
diff --git a/middleman-core/lib/middleman-core/extension.rb b/middleman-core/lib/middleman-core/extension.rb
index 6bc59f7d..887a05fb 100644
--- a/middleman-core/lib/middleman-core/extension.rb
+++ b/middleman-core/lib/middleman-core/extension.rb
@@ -3,9 +3,9 @@ require 'active_support/core_ext/class/attribute'
 
 module Middleman
   class Extension
-    class_attribute :supports_multiple_instances, :instance_reader => false, :instance_writer => false
-    class_attribute :defined_helpers, :instance_reader => false, :instance_writer => false
-    class_attribute :ext_name, :instance_reader => false, :instance_writer => false
+    class_attribute :supports_multiple_instances, instance_reader: false, instance_writer: false
+    class_attribute :defined_helpers, instance_reader: false, instance_writer: false
+    class_attribute :ext_name, instance_reader: false, instance_writer: false
 
     class << self
       def config
@@ -23,7 +23,7 @@ module Middleman
       def helpers(*m, &block)
         self.defined_helpers ||= []
 
-        if block
+        if block_given?
           mod = Module.new
           mod.module_eval(&block)
           m = [mod]
@@ -66,7 +66,7 @@ module Middleman
     attr_accessor :options
     attr_reader :app
 
-    delegate :after_extension_activated, :to => :"::Middleman::Extension"
+    delegate :after_extension_activated, to: :"::Middleman::Extension"
 
     def initialize(klass, options_hash={}, &block)
       @_helpers = []
@@ -92,7 +92,7 @@ module Middleman
 
     protected
 
-    def setup_options(options_hash, &block)
+    def setup_options(options_hash)
       @options = self.class.config.dup
       @options.finalize!
 
@@ -127,10 +127,9 @@ module Middleman
     def bind_after_configuration
       ext = self
       @klass.after_configuration do
-        if ext.respond_to?(:after_configuration)
-          ext.after_configuration
-        end
+        ext.after_configuration if ext.respond_to?(:after_configuration)
 
+        # rubocop:disable IfUnlessModifier
         if ext.respond_to?(:manipulate_resource_list)
           ext.app.sitemap.register_resource_list_manipulator(ext.class.extension_name, ext)
         end
diff --git a/middleman-core/lib/middleman-core/meta_pages.rb b/middleman-core/lib/middleman-core/meta_pages.rb
index f2eca41d..8e1a68a7 100644
--- a/middleman-core/lib/middleman-core/meta_pages.rb
+++ b/middleman-core/lib/middleman-core/meta_pages.rb
@@ -19,7 +19,7 @@ module Middleman
         meta_pages = self
         @rack_app = Rack::Builder.new do
           # Serve assets from metadata/assets
-          use Rack::Static, :urls => ['/assets'], :root => File.join(File.dirname(__FILE__), 'meta_pages')
+          use Rack::Static, urls: ['/assets'], root: File.join(File.dirname(__FILE__), 'meta_pages')
 
           map '/' do
             run meta_pages.method(:index)
@@ -54,7 +54,7 @@ module Middleman
           sitemap_tree.add_resource resource
         end
 
-        template('sitemap.html.erb', :sitemap_tree => sitemap_tree)
+        template('sitemap.html.erb', sitemap_tree: sitemap_tree)
       end
 
       # Inspect configuration
@@ -80,9 +80,9 @@ module Middleman
         end
 
         template('config.html.erb',
-                 :global_config => global_config,
-                 :extension_config => extension_config,
-                 :registered_extensions => Middleman::Extensions.registered.dup)
+                 global_config: global_config,
+                 extension_config: extension_config,
+                 registered_extensions: Middleman::Extensions.registered.dup)
       end
 
       private
diff --git a/middleman-core/lib/middleman-core/meta_pages/config_setting.rb b/middleman-core/lib/middleman-core/meta_pages/config_setting.rb
index 3fd223e3..d10a484a 100644
--- a/middleman-core/lib/middleman-core/meta_pages/config_setting.rb
+++ b/middleman-core/lib/middleman-core/meta_pages/config_setting.rb
@@ -15,17 +15,17 @@ module Middleman
         content = ''
         key_classes = ['key']
         key_classes << 'modified' if @setting.value_set?
-        content << content_tag(:span, @setting.key.pretty_inspect.strip, :class => key_classes.join(' '))
+        content << content_tag(:span, @setting.key.pretty_inspect.strip, class: key_classes.join(' '))
         content << ' = '
-        content << content_tag(:span, @setting.value.pretty_inspect.strip, :class => 'value')
+        content << content_tag(:span, @setting.value.pretty_inspect.strip, class: 'value')
         if @setting.default && @setting.value_set? && @setting.default != @setting.value
-          content << content_tag(:span, :class => 'default') do
+          content << content_tag(:span, class: 'default') do
             "(Default: #{@setting.default.inspect})"
           end
         end
 
         if @setting.description
-          content << content_tag(:p, :class => 'description') do
+          content << content_tag(:p, class: 'description') do
             @setting.description
           end
         end
diff --git a/middleman-core/lib/middleman-core/meta_pages/sitemap_resource.rb b/middleman-core/lib/middleman-core/meta_pages/sitemap_resource.rb
index d16b9154..e42176df 100644
--- a/middleman-core/lib/middleman-core/meta_pages/sitemap_resource.rb
+++ b/middleman-core/lib/middleman-core/meta_pages/sitemap_resource.rb
@@ -14,7 +14,7 @@ module Middleman
       def render
         classes = 'resource-details'
         classes << ' ignored' if @resource.ignored?
-        content_tag :div, :class => classes do
+        content_tag :div, class: classes do
           content_tag :table do
             content = ''
             resource_properties.each do |label, value|
@@ -38,7 +38,7 @@ module Middleman
         build_path = @resource.destination_path
         build_path = 'Not built' if ignored?
         props['Build Path'] = build_path if @resource.path != build_path
-        props['URL'] = content_tag(:a, @resource.url, :href => @resource.url) unless ignored?
+        props['URL'] = content_tag(:a, @resource.url, href: @resource.url) unless ignored?
         props['Source File'] = @resource.source_file.sub(/^#{Regexp.escape(ENV['MM_ROOT'] + '/')}/, '')
 
         data = @resource.data
diff --git a/middleman-core/lib/middleman-core/meta_pages/sitemap_tree.rb b/middleman-core/lib/middleman-core/meta_pages/sitemap_tree.rb
index ab2f03d9..4ba89350 100644
--- a/middleman-core/lib/middleman-core/meta_pages/sitemap_tree.rb
+++ b/middleman-core/lib/middleman-core/meta_pages/sitemap_tree.rb
@@ -13,8 +13,7 @@ module Middleman
       end
 
       def render
-        content = ''
-        @children.keys.sort do |a, b|
+        sorted_children_keys = @children.keys.sort do |a, b|
           a_subtree = @children[a]
           b_subtree = @children[b]
           if a_subtree.is_a? SitemapResource
@@ -32,7 +31,9 @@ module Middleman
           else
             a.downcase <=> b.downcase
           end
-        end.each do |path_part|
+        end
+
+        sorted_children_keys.reduce('') do |content, path_part|
           subtree = @children[path_part]
           content << "<details class='#{subtree.css_classes.join(' ')}'>"
           content << '<summary>'
@@ -41,7 +42,6 @@ module Middleman
           content << subtree.render
           content << '</details>'
         end
-        content
       end
 
       def css_classes
diff --git a/middleman-core/lib/middleman-core/preview_server.rb b/middleman-core/lib/middleman-core/preview_server.rb
index 03e117bf..41e7d5cf 100644
--- a/middleman-core/lib/middleman-core/preview_server.rb
+++ b/middleman-core/lib/middleman-core/preview_server.rb
@@ -2,13 +2,14 @@ require 'webrick'
 require 'middleman-core/meta_pages'
 require 'middleman-core/logger'
 
+# rubocop:disable GlobalVars
 module Middleman
   module PreviewServer
     DEFAULT_PORT = 4567
 
     class << self
       attr_reader :app, :host, :port
-      delegate :logger, :to => :app
+      delegate :logger, to: :app
 
       # Start an instance of Middleman::Application
       # @return [void]
@@ -89,6 +90,7 @@ module Middleman
       end
 
       private
+
       def new_app
         opts = @options.dup
         server = ::Middleman::Application.server
@@ -119,7 +121,7 @@ module Middleman
         if first_run
           # Watcher Library
           require 'listen'
-          @listener = Listen.to(Dir.pwd, :relative_paths => true, :force_polling => @options[:force_polling])
+          @listener = Listen.to(Dir.pwd, relative_paths: true, force_polling: @options[:force_polling])
           @listener.latency(@options[:latency])
         end
 
@@ -165,10 +167,10 @@ module Middleman
       # @return [void]
       def setup_webrick(is_logging)
         http_opts = {
-          :BindAddress        => host,
-          :Port               => port,
-          :AccessLog          => [],
-          :DoNotReverseLookup => true
+          BindAddress: host,
+          Port: port,
+          AccessLog: [],
+          DoNotReverseLookup: true
         }
 
         if is_logging
diff --git a/middleman-core/lib/middleman-core/profiling.rb b/middleman-core/lib/middleman-core/profiling.rb
index 3c8927dc..d5b43ef4 100644
--- a/middleman-core/lib/middleman-core/profiling.rb
+++ b/middleman-core/lib/middleman-core/profiling.rb
@@ -1,6 +1,7 @@
 module Middleman
   module Profiling
     # The profiler instance. There can only be one!
+    # rubocop:disable TrivialAccessors
     def self.profiler=(prof)
       @profiler = prof
     end
@@ -23,7 +24,7 @@ module Middleman
       def start
       end
 
-      def report(report_name)
+      def report(_)
       end
     end
 
@@ -47,7 +48,7 @@ module Middleman
         outfile = (outfile + '.html') unless outfile.end_with? '.html'
         FileUtils.mkdir_p(File.dirname(outfile))
         File.open(outfile, 'w') do |f|
-          printer.print(f, :min_percent => 1)
+          printer.print(f, min_percent: 1)
         end
       end
     end
diff --git a/middleman-core/lib/middleman-core/renderers/asciidoc.rb b/middleman-core/lib/middleman-core/renderers/asciidoc.rb
index 5be25520..9ad14a53 100644
--- a/middleman-core/lib/middleman-core/renderers/asciidoc.rb
+++ b/middleman-core/lib/middleman-core/renderers/asciidoc.rb
@@ -6,13 +6,13 @@ module Middleman
       class << self
         def registered(app)
           app.config.define_setting :asciidoc, {
-            :safe => :safe,
-            :backend => :html5,
-            :attributes => %W(showtitle env=middleman env-middleman middleman-version=#{::Middleman::VERSION})
+            safe: :safe,
+            backend: :html5,
+            attributes: %W(showtitle env=middleman env-middleman middleman-version=#{::Middleman::VERSION})
           }, 'AsciiDoc engine options (Hash)'
           app.config.define_setting :asciidoc_attributes, [], 'AsciiDoc custom attributes (Array)'
           app.before_configuration do
-            template_extensions :adoc => :html
+            template_extensions adoc: :html
           end
 
           app.after_configuration do
@@ -23,7 +23,7 @@ module Middleman
             sitemap.provides_metadata(/\.adoc$/) do |path|
               # read the AsciiDoc header only to set page options and data
               # header values can be accessed via app.data.page.<name> in the layout
-              doc = Asciidoctor.load_file path, :safe => :safe, :parse_header_only => true
+              doc = Asciidoctor.load_file path, safe: :safe, parse_header_only: true
 
               opts = {}
               if doc.attr? 'page-layout'
@@ -35,7 +35,7 @@ module Middleman
                 end
               end
               opts[:layout_engine] = (doc.attr 'page-layout-engine') if doc.attr? 'page-layout-engine'
-              # TODO override attributes to set docfile, docdir, docname, etc
+              # TODO: override attributes to set docfile, docdir, docname, etc
               # alternative is to set :renderer_options, which get merged into options by the rendering extension
               # opts[:attributes] = config[:asciidoc][:attributes].dup
               # opts[:attributes].concat %W(docfile=#{path} docdir=#{File.dirname path} docname=#{(File.basename path).sub(/\.adoc$/, '')})
@@ -43,10 +43,10 @@ module Middleman
               page = {}
               page[:title] = doc.doctitle
               page[:date] = (doc.attr 'date') unless (doc.attr 'date').nil?
-              # TODO grab all the author information
+              # TODO: grab all the author information
               page[:author] = (doc.attr 'author') unless (doc.attr 'author').nil?
 
-              { :options => opts, :page => ::Middleman::Util.recursively_enhance(page) }
+              { options: opts, page: ::Middleman::Util.recursively_enhance(page) }
             end
           end
         end
diff --git a/middleman-core/lib/middleman-core/renderers/coffee_script.rb b/middleman-core/lib/middleman-core/renderers/coffee_script.rb
index 047d25a4..aef0f0fd 100644
--- a/middleman-core/lib/middleman-core/renderers/coffee_script.rb
+++ b/middleman-core/lib/middleman-core/renderers/coffee_script.rb
@@ -14,7 +14,7 @@ module Middleman
           ::Tilt.prefer(DebuggingCoffeeScriptTemplate)
 
           app.before_configuration do
-            template_extensions :coffee => :js
+            template_extensions coffee: :js
             DebuggingCoffeeScriptTemplate.middleman_app = self
           end
         end
diff --git a/middleman-core/lib/middleman-core/renderers/erb.rb b/middleman-core/lib/middleman-core/renderers/erb.rb
index abec76f9..9a20787e 100644
--- a/middleman-core/lib/middleman-core/renderers/erb.rb
+++ b/middleman-core/lib/middleman-core/renderers/erb.rb
@@ -7,7 +7,7 @@ module Middleman
         # once registered
         def registered(app)
           app.before_configuration do
-            template_extensions :erb => :html
+            template_extensions erb: :html
           end
 
           # After config
diff --git a/middleman-core/lib/middleman-core/renderers/haml.rb b/middleman-core/lib/middleman-core/renderers/haml.rb
index b160610d..1e63b474 100644
--- a/middleman-core/lib/middleman-core/renderers/haml.rb
+++ b/middleman-core/lib/middleman-core/renderers/haml.rb
@@ -20,7 +20,7 @@ module Middleman
         # Once registered
         def registered(app)
           app.before_configuration do
-            template_extensions :haml => :html
+            template_extensions haml: :html
           end
 
           # Add haml helpers to context
diff --git a/middleman-core/lib/middleman-core/renderers/kramdown.rb b/middleman-core/lib/middleman-core/renderers/kramdown.rb
index 898b4e25..309e6034 100644
--- a/middleman-core/lib/middleman-core/renderers/kramdown.rb
+++ b/middleman-core/lib/middleman-core/renderers/kramdown.rb
@@ -4,7 +4,7 @@ module Middleman
   module Renderers
     # Our own Kramdown Tilt template that simply uses our custom renderer.
     class KramdownTemplate < ::Tilt::KramdownTemplate
-      def evaluate(scope, locals, &block)
+      def evaluate(*)
         @output ||= begin
           output, warnings = MiddlemanKramdownHTML.convert(@engine.root, @engine.options)
           @engine.warnings.concat(warnings)
@@ -17,7 +17,7 @@ module Middleman
     class MiddlemanKramdownHTML < ::Kramdown::Converter::Html
       cattr_accessor :middleman_app
 
-      def convert_img(el, indent)
+      def convert_img(el, _)
         attrs = el.attr.dup
 
         link = attrs.delete('src')
diff --git a/middleman-core/lib/middleman-core/renderers/less.rb b/middleman-core/lib/middleman-core/renderers/less.rb
index ba567635..fd840219 100644
--- a/middleman-core/lib/middleman-core/renderers/less.rb
+++ b/middleman-core/lib/middleman-core/renderers/less.rb
@@ -12,7 +12,7 @@ module Middleman
           app.config.define_setting :less, {}, 'LESS compiler options'
 
           app.before_configuration do
-            template_extensions :less => :css
+            template_extensions less: :css
           end
 
           app.after_configuration do
@@ -33,7 +33,7 @@ module Middleman
           if ::Less.const_defined? :Engine
             @engine = ::Less::Engine.new(data)
           else
-            parser  = ::Less::Parser.new(options.merge :filename => eval_file, :line => line, :paths => ['.', File.dirname(eval_file)])
+            parser  = ::Less::Parser.new(options.merge filename: eval_file, line: line, paths: ['.', File.dirname(eval_file)])
             @engine = parser.parse(data)
           end
         end
diff --git a/middleman-core/lib/middleman-core/renderers/liquid.rb b/middleman-core/lib/middleman-core/renderers/liquid.rb
index a55dfd4b..376a8709 100644
--- a/middleman-core/lib/middleman-core/renderers/liquid.rb
+++ b/middleman-core/lib/middleman-core/renderers/liquid.rb
@@ -10,7 +10,7 @@ module Middleman
         # Once registerd
         def registered(app)
           app.before_configuration do
-            template_extensions :liquid => :html
+            template_extensions liquid: :html
           end
 
           # After config, setup liquid partial paths
@@ -18,8 +18,8 @@ module Middleman
             ::Liquid::Template.file_system = ::Liquid::LocalFileSystem.new(source_dir)
 
             # Convert data object into a hash for liquid
-            sitemap.provides_metadata %r{\.liquid$} do |path|
-              { :locals => { :data => data.to_h } }
+            sitemap.provides_metadata %r{\.liquid$} do
+              { locals: { data: data.to_h } }
             end
           end
         end
diff --git a/middleman-core/lib/middleman-core/renderers/markdown.rb b/middleman-core/lib/middleman-core/renderers/markdown.rb
index e9118c52..46d22439 100644
--- a/middleman-core/lib/middleman-core/renderers/markdown.rb
+++ b/middleman-core/lib/middleman-core/renderers/markdown.rb
@@ -11,11 +11,11 @@ module Middleman
           app.config.define_setting :markdown_engine_prefix, ::Tilt, 'The parent module for markdown template engines'
 
           app.before_configuration do
-            template_extensions :markdown => :html,
-                                :mdown    => :html,
-                                :md       => :html,
-                                :mkd      => :html,
-                                :mkdn     => :html
+            template_extensions markdown: :html,
+                                mdown: :html,
+                                md: :html,
+                                mkd: :html,
+                                mkdn: :html
           end
 
           # Once configuration is parsed
diff --git a/middleman-core/lib/middleman-core/renderers/redcarpet.rb b/middleman-core/lib/middleman-core/renderers/redcarpet.rb
index f792bc28..70094b53 100644
--- a/middleman-core/lib/middleman-core/renderers/redcarpet.rb
+++ b/middleman-core/lib/middleman-core/renderers/redcarpet.rb
@@ -6,7 +6,7 @@ module Middleman
       # because tilt has decided to convert these
       # in the wrong direction
       ALIASES = {
-        :escape_html => :filter_html
+        escape_html: :filter_html
       }
 
       # Overwrite built-in Tilt version.
@@ -59,7 +59,7 @@ module Middleman
 
       def image(link, title, alt_text)
         if !@local_options[:no_images]
-          middleman_app.image_tag(link, :title => title, :alt => alt_text)
+          middleman_app.image_tag(link, title: title, alt: alt_text)
         else
           link_string = link.dup
           link_string << %Q("#{title}") if title && title.length > 0 && title != alt_text
@@ -69,7 +69,7 @@ module Middleman
 
       def link(link, title, content)
         if !@local_options[:no_links]
-          attributes = { :title => title }
+          attributes = { title: title }
           attributes.merge!(@local_options[:link_attributes]) if @local_options[:link_attributes]
 
           middleman_app.link_to(content, link, attributes)
diff --git a/middleman-core/lib/middleman-core/renderers/sass.rb b/middleman-core/lib/middleman-core/renderers/sass.rb
index 86d83acb..9165db23 100644
--- a/middleman-core/lib/middleman-core/renderers/sass.rb
+++ b/middleman-core/lib/middleman-core/renderers/sass.rb
@@ -13,8 +13,8 @@ module Middleman
           app.config.define_setting :sass, {}, 'Sass engine options'
 
           app.before_configuration do
-            template_extensions :scss => :css,
-                                :sass => :css
+            template_extensions scss: :css,
+                                sass: :css
           end
 
           # Tell Tilt to use it as well (for inline sass blocks)
@@ -36,9 +36,7 @@ module Middleman
         def initialize(*args, &block)
           super
 
-          if @options.key?(:context)
-            @context = @options[:context]
-          end
+          @context = @options[:context] if @options.key?(:context)
         end
 
         # Define the expected syntax for the template
@@ -51,23 +49,22 @@ module Middleman
 
         # Add exception messaging
         # @param [Class] context
-        # @param [Hash] locals
         # @return [String]
-        def evaluate(context, locals, &block)
+        def evaluate(context, _)
           @context ||= context
           @engine = ::Sass::Engine.new(data, sass_options)
 
           begin
             @engine.render
           rescue ::Sass::SyntaxError => e
-            ::Sass::SyntaxError.exception_to_css(e, :full_exception => true)
+            ::Sass::SyntaxError.exception_to_css(e, full_exception: true)
           end
         end
 
         # Change Sass path, for url functions, to the build folder if we're building
         # @return [Hash]
         def sass_options
-          more_opts = { :filename => eval_file, :line => line, :syntax => syntax }
+          more_opts = { filename: eval_file, line: line, syntax: syntax }
 
           if @context.is_a?(::Middleman::Application) && file
             location_of_sass_file = @context.source_dir
diff --git a/middleman-core/lib/middleman-core/renderers/slim.rb b/middleman-core/lib/middleman-core/renderers/slim.rb
index 8130d44c..6a5160ab 100644
--- a/middleman-core/lib/middleman-core/renderers/slim.rb
+++ b/middleman-core/lib/middleman-core/renderers/slim.rb
@@ -24,20 +24,20 @@ module Middleman
         # Once registered
         def registered(app)
           app.before_configuration do
-            template_extensions :slim => :html
+            template_extensions slim: :html
           end
 
           # Setup Slim options to work with partials
           ::Slim::Engine.set_default_options(
-            :buffer    => '@_out_buf',
-            :use_html_safe => true,
-            :generator => ::Temple::Generators::RailsOutputBuffer,
-            :disable_escape => true
+            buffer: '@_out_buf',
+            use_html_safe: true,
+            generator: ::Temple::Generators::RailsOutputBuffer,
+            disable_escape: true
           )
 
           app.after_configuration do
             context_hack = {
-              :context => self
+              context: self
             }
 
             ::Slim::Embedded::SassEngine.disable_option_validator!
diff --git a/middleman-core/lib/middleman-core/renderers/stylus.rb b/middleman-core/lib/middleman-core/renderers/stylus.rb
index 5a929e44..7a4f2eb3 100644
--- a/middleman-core/lib/middleman-core/renderers/stylus.rb
+++ b/middleman-core/lib/middleman-core/renderers/stylus.rb
@@ -13,7 +13,7 @@ module Middleman
           app.set :styl, {}
 
           app.before_configuration do
-            template_extensions :styl => :css
+            template_extensions styl: :css
           end
         end
 
diff --git a/middleman-core/lib/middleman-core/sitemap.rb b/middleman-core/lib/middleman-core/sitemap.rb
index 1a758011..10754990 100644
--- a/middleman-core/lib/middleman-core/sitemap.rb
+++ b/middleman-core/lib/middleman-core/sitemap.rb
@@ -25,17 +25,17 @@ module Middleman
         # Setup callbacks which can exclude paths from the sitemap
         app.config.define_setting :ignored_sitemap_matchers, {
           # dotfiles and folders in the root
-          :root_dotfiles => proc { |file| file.start_with?('.') },
+          root_dotfiles: proc { |file| file.start_with?('.') },
 
           # Files starting with an dot, but not .htaccess
-          :source_dotfiles => proc { |file|
+          source_dotfiles: proc { |file|
             file =~ %r{/\.} && file !~ %r{/\.(htaccess|htpasswd|nojekyll)}
           },
 
           # Files starting with an underscore, but not a double-underscore
-          :partials => proc { |file| file =~ %r{/_[^_]} },
+          partials: proc { |file| file =~ %r{/_[^_]} },
 
-          :layout => proc { |file, sitemap_app|
+          layout: proc { |file, sitemap_app|
             file.start_with?(File.join(sitemap_app.config[:source], 'layout.')) || file.start_with?(File.join(sitemap_app.config[:source], 'layouts/'))
           }
         }, 'Callbacks that can exclude paths from the sitemap'
diff --git a/middleman-core/lib/middleman-core/sitemap/extensions/on_disk.rb b/middleman-core/lib/middleman-core/sitemap/extensions/on_disk.rb
index abb917e4..2c51063e 100644
--- a/middleman-core/lib/middleman-core/sitemap/extensions/on_disk.rb
+++ b/middleman-core/lib/middleman-core/sitemap/extensions/on_disk.rb
@@ -35,13 +35,13 @@ module Middleman
         # Update or add an on-disk file path
         # @param [String] file
         # @return [Boolean]
-        def touch_file(file, rebuild=true)
+        def touch_file(file)
           return false if File.directory?(file)
 
           path = @sitemap.file_to_path(file)
           return false unless path
 
-          ignored = @app.config[:ignored_sitemap_matchers].any? do |name, callback|
+          ignored = @app.config[:ignored_sitemap_matchers].any? do |_, callback|
             if callback.arity == 1
               callback.call(file)
             else
@@ -67,7 +67,7 @@ module Middleman
         # Remove a file from the store
         # @param [String] file
         # @return [void]
-        def remove_file(file, rebuild=true)
+        def remove_file(file)
           if @file_paths_on_disk.delete?(file)
             @sitemap.rebuild_resource_list!(:removed_file)
             unless waiting_for_ready || @app.build?
diff --git a/middleman-core/lib/middleman-core/sitemap/extensions/proxies.rb b/middleman-core/lib/middleman-core/sitemap/extensions/proxies.rb
index dcd89edc..2ecec61a 100644
--- a/middleman-core/lib/middleman-core/sitemap/extensions/proxies.rb
+++ b/middleman-core/lib/middleman-core/sitemap/extensions/proxies.rb
@@ -17,9 +17,10 @@ module Middleman
 
         module ResourceInstanceMethods
           # Whether this page is a proxy
+          # rubocop:disable TrivialAccessors
           # @return [Boolean]
           def proxy?
-            !!@proxied_to
+            @proxied_to
           end
 
           # Set this page to proxy to a target path
@@ -52,6 +53,7 @@ module Middleman
             proxy_resource
           end
 
+          # rubocop:disable AccessorMethodName
           def get_source_file
             if proxy?
               proxied_to_resource.source_file
@@ -97,14 +99,14 @@ module Middleman
           #               :locals, :ignore to hide the proxy target, :layout, and :directory_indexes.
           # @return [void]
           def proxy(path, target, opts={}, &block)
-            metadata = { :options => {}, :locals => {}, :blocks => [] }
+            metadata = { options: {}, locals: {}, blocks: [] }
             metadata[:blocks] << block if block_given?
             metadata[:locals] = opts.delete(:locals) || {}
 
             @app.ignore(target) if opts.delete(:ignore)
             metadata[:options] = opts
 
-            @proxy_configs << ProxyConfiguration.new(:path => path, :target => target, :metadata => metadata)
+            @proxy_configs << ProxyConfiguration.new(path: path, target: target, metadata: metadata)
 
             @app.sitemap.rebuild_resource_list!(:added_proxy)
           end
diff --git a/middleman-core/lib/middleman-core/sitemap/extensions/redirects.rb b/middleman-core/lib/middleman-core/sitemap/extensions/redirects.rb
index 86431809..fdf1315f 100644
--- a/middleman-core/lib/middleman-core/sitemap/extensions/redirects.rb
+++ b/middleman-core/lib/middleman-core/sitemap/extensions/redirects.rb
@@ -35,9 +35,7 @@ module Middleman
           # @param [String] path
           # @param [Hash] opts The :to value gives a target path
           def create_redirect(path, opts={}, &block)
-            if block_given?
-              opts[:template] = block
-            end
+            opts[:template] = block if block_given?
 
             @redirects[path] = opts
 
@@ -72,10 +70,10 @@ module Middleman
             true
           end
 
-          def render(*args, &block)
+          def render(*)
             url = ::Middleman::Util.url_for(store.app, @request_path,
-                                            :relative => false,
-                                            :find_resource => true
+                                            relative: false,
+                                            find_resource: true
             )
 
             if output
diff --git a/middleman-core/lib/middleman-core/sitemap/extensions/request_endpoints.rb b/middleman-core/lib/middleman-core/sitemap/extensions/request_endpoints.rb
index 8562c297..08d39455 100644
--- a/middleman-core/lib/middleman-core/sitemap/extensions/request_endpoints.rb
+++ b/middleman-core/lib/middleman-core/sitemap/extensions/request_endpoints.rb
@@ -37,7 +37,7 @@ module Middleman
           # differs from the output path
           def create_endpoint(path, opts={}, &block)
             endpoint = {
-              :request_path => path
+              request_path: path
             }
 
             if block_given?
@@ -79,7 +79,7 @@ module Middleman
             true
           end
 
-          def render(*args, &block)
+          def render(*)
             return output.call if output
           end
 
diff --git a/middleman-core/lib/middleman-core/sitemap/extensions/traversal.rb b/middleman-core/lib/middleman-core/sitemap/extensions/traversal.rb
index de9f7e38..95d7658b 100644
--- a/middleman-core/lib/middleman-core/sitemap/extensions/traversal.rb
+++ b/middleman-core/lib/middleman-core/sitemap/extensions/traversal.rb
@@ -69,7 +69,7 @@ module Middleman
             return true
           end
           full_path = File.join(app.source_dir, eponymous_directory_path)
-          !!(File.exist?(full_path) && File.directory?(full_path))
+          File.exist?(full_path) && File.directory?(full_path)
         end
 
         # The path for this resource if it were a directory, and not a file
diff --git a/middleman-core/lib/middleman-core/sitemap/queryable.rb b/middleman-core/lib/middleman-core/sitemap/queryable.rb
index d835e9cf..af225e5d 100644
--- a/middleman-core/lib/middleman-core/sitemap/queryable.rb
+++ b/middleman-core/lib/middleman-core/sitemap/queryable.rb
@@ -73,33 +73,33 @@ module Middleman
         end
 
         def where(constraints_hash)
-          selector_hash = constraints_hash.reject { |key, value| !key.is_a? Selector }
-          symbol_hash = constraints_hash.reject { |key, value| key.is_a? Selector }
+          selector_hash = constraints_hash.reject { |key, _| !key.is_a? Selector }
+          symbol_hash = constraints_hash.reject { |key, _| key.is_a? Selector }
           symbol_hash.each do |attribute, value|
-            selector = Selector.new(:attribute => attribute, :operator => 'equal')
+            selector = Selector.new(attribute: attribute, operator: 'equal')
             selector_hash.update(selector => value)
           end
-          Query.new @model, opts(:where => @where.merge(selector_hash))
+          Query.new @model, opts(where: @where.merge(selector_hash))
         end
 
         def opts(new_opts)
-          { :where => {}.merge(@where),
-            :order_by => @order_by,
-            :offset => @offset,
-            :limit => @limit
+          { where: {}.merge(@where),
+            order_by: @order_by,
+            offset: @offset,
+            limit: @limit
           }.merge(new_opts)
         end
 
         def order_by(field)
-          Query.new @model, opts(:order_by => field.is_a?(Symbol) ? { field => :asc } : field)
+          Query.new @model, opts(order_by: field.is_a?(Symbol) ? { field => :asc } : field)
         end
 
         def offset(number)
-          Query.new @model, opts(:offset => number)
+          Query.new @model, opts(offset: number)
         end
 
         def limit(number)
-          Query.new @model, opts(:limit => number)
+          Query.new @model, opts(limit: number)
         end
 
         def first
@@ -111,13 +111,9 @@ module Middleman
         end
 
         def all
-          result = @model.select(:where => @where, :order_by => @order_by)
-          if @offset.present?
-            result = result.last([result.size - @offset, 0].max)
-          end
-          if @limit.present?
-            result = result.first(@limit)
-          end
+          result = @model.select(where: @where, order_by: @order_by)
+          result = result.last([result.size - @offset, 0].max) if @offset.present?
+          result = result.first(@limit) if @limit.present?
           result
         end
       end
diff --git a/middleman-core/lib/middleman-core/sitemap/resource.rb b/middleman-core/lib/middleman-core/sitemap/resource.rb
index 610641d6..e86449d7 100644
--- a/middleman-core/lib/middleman-core/sitemap/resource.rb
+++ b/middleman-core/lib/middleman-core/sitemap/resource.rb
@@ -11,7 +11,7 @@ module Middleman
 
       # @return [Middleman::Application]
       attr_reader :app
-      delegate :logger, :instrument, :to => :app
+      delegate :logger, :instrument, to: :app
 
       # @return [Middleman::Sitemap::Store]
       attr_reader :store
@@ -44,7 +44,7 @@ module Middleman
         @source_file = source_file
         @destination_path = @path
 
-        @local_metadata = { :options => {}, :locals => {}, :page => {}, :blocks => [] }
+        @local_metadata = { options: {}, locals: {}, page: {}, blocks: [] }
       end
 
       # Whether this resource has a template file
@@ -60,15 +60,11 @@ module Middleman
         result = store.metadata_for_path(path).dup
 
         file_meta = store.metadata_for_file(source_file).dup
-        if file_meta.key?(:blocks)
-          result[:blocks] += file_meta.delete(:blocks)
-        end
+        result[:blocks] += file_meta.delete(:blocks) if file_meta.key?(:blocks)
         result.deep_merge!(file_meta)
 
         local_meta = @local_metadata.dup
-        if local_meta.key?(:blocks)
-          result[:blocks] += local_meta.delete(:blocks)
-        end
+        result[:blocks] += local_meta.delete(:blocks) if local_meta.key?(:blocks)
         result.deep_merge!(local_meta)
 
         result[:blocks] = result[:blocks].flatten.compact
@@ -79,9 +75,7 @@ module Middleman
       # @param [Hash] metadata A metadata block like provides_metadata_for_path takes
       def add_metadata(metadata={}, &block)
         metadata = metadata.dup
-        if metadata.key?(:blocks)
-          @local_metadata[:blocks] += metadata.delete(:blocks)
-        end
+        @local_metadata[:blocks] += metadata.delete(:blocks) if metadata.key?(:blocks)
         @local_metadata.deep_merge!(metadata)
         @local_metadata[:blocks] += [block] if block_given?
       end
@@ -103,13 +97,11 @@ module Middleman
       # Render this resource
       # @return [String]
       def render(opts={}, locs={}, &block)
-        unless template?
-          return app.template_data_for_file(source_file)
-        end
+        return app.template_data_for_file(source_file) unless template?
 
         relative_source = Pathname(source_file).relative_path_from(Pathname(app.root))
 
-        instrument 'render.resource', :path => relative_source, :destination_path => destination_path  do
+        instrument 'render.resource', path: relative_source, destination_path: destination_path  do
           md   = metadata.dup
           opts = md[:options].deep_merge(opts)
 
@@ -124,9 +116,7 @@ module Middleman
           locs = md[:locals].deep_merge(locs)
 
           # Forward remaining data to helpers
-          if md.key?(:page)
-            app.data.store('page', md[:page])
-          end
+          app.data.store('page', md[:page]) if md.key?(:page)
 
           blocks = Array(md[:blocks]).dup
           blocks << block if block_given?
diff --git a/middleman-core/lib/middleman-core/sitemap/store.rb b/middleman-core/lib/middleman-core/sitemap/store.rb
index c4fe78ae..6fbb8b68 100644
--- a/middleman-core/lib/middleman-core/sitemap/store.rb
+++ b/middleman-core/lib/middleman-core/sitemap/store.rb
@@ -49,12 +49,13 @@ module Middleman
       # @param [Symbol] name Name of the manipulator for debugging
       # @param [Class, Module] inst Abstract namespace which can update the resource list
       # @return [void]
-      def register_resource_list_manipulator(name, inst, unused=true)
+      def register_resource_list_manipulator(name, inst, *)
         @resource_list_manipulators << [name, inst]
         rebuild_resource_list!(:registered_new)
       end
 
       # Rebuild the list of resources from scratch, using registed manipulators
+      # rubocop:disable UnusedMethodArgument
       # @return [void]
       def rebuild_resource_list!(reason=nil)
         @lock.synchronize do
@@ -117,7 +118,7 @@ module Middleman
       # @param [String] source_file
       # @return [Hash]
       def metadata_for_file(source_file)
-        blank_metadata = { :options => {}, :locals => {}, :page => {}, :blocks => [] }
+        blank_metadata = { options: {}, locals: {}, page: {}, blocks: [] }
 
         provides_metadata.reduce(blank_metadata) do |result, (callback, matcher)|
           next result if matcher && !source_file.match(matcher)
@@ -151,7 +152,7 @@ module Middleman
       def metadata_for_path(request_path)
         return @_cached_metadata[request_path] if @_cached_metadata[request_path]
 
-        blank_metadata = { :options => {}, :locals => {}, :page => {}, :blocks => [] }
+        blank_metadata = { options: {}, locals: {}, page: {}, blocks: [] }
 
         @_cached_metadata[request_path] = provides_metadata_for_path.reduce(blank_metadata) do |result, (callback, matcher)|
           case matcher
@@ -252,9 +253,7 @@ module Middleman
         if @app.respond_to? :langs
           path_bits = path.split('.')
           lang = path_bits.last
-          if @app.langs.include?(lang.to_sym)
-            return path_bits[0..-2].join('.')
-          end
+          return path_bits[0..-2].join('.') if @app.langs.include?(lang.to_sym)
         end
 
         path
diff --git a/middleman-core/lib/middleman-core/templates.rb b/middleman-core/lib/middleman-core/templates.rb
index 312e64b3..2f321608 100644
--- a/middleman-core/lib/middleman-core/templates.rb
+++ b/middleman-core/lib/middleman-core/templates.rb
@@ -39,13 +39,13 @@ module Middleman::Templates
     end
 
     # Required path for the new project to be generated
-    argument :location, :type => :string
+    argument :location, type: :string
 
     # Name of the template being used to generate the project.
-    class_option :template, :default => 'default'
+    class_option :template, default: 'default'
 
     # Output a config.ru file for Rack if --rack is passed
-    class_option :rack, :type => :boolean, :default => false
+    class_option :rack, type: :boolean, default: false
 
     # Write a Rack config.ru file for project
     # @return [void]
@@ -54,8 +54,8 @@ module Middleman::Templates
       template 'shared/config.ru', File.join(location, 'config.ru')
     end
 
-    class_option :'skip-bundle', :type => :boolean, :default => false
-    class_option :'skip-gemfile', :type => :boolean, :default => false
+    class_option :'skip-bundle', type: :boolean, default: false
+    class_option :'skip-gemfile', type: :boolean, default: false
 
     # Write a Bundler Gemfile file for project
     # @return [void]
@@ -70,7 +70,7 @@ module Middleman::Templates
     end
 
     # Output a .gitignore file
-    class_option :'skip-git', :type => :boolean, :default => false
+    class_option :'skip-git', type: :boolean, default: false
 
     # Write a .gitignore file for project
     # @return [void]
@@ -94,9 +94,8 @@ require 'middleman-core/templates/mobile'
 require 'middleman-more/templates/smacss'
 
 # Local templates
-if ENV['HOME'] # Sometimes HOME doesn't exist, in which case there's no point to local templates
-  require 'middleman-core/templates/local'
-end
+# Sometimes HOME doesn't exist, in which case there's no point to local templates
+require 'middleman-core/templates/local' if ENV['HOME']
 
 # Barebones template
 require 'middleman-core/templates/empty'
diff --git a/middleman-core/lib/middleman-core/templates/default.rb b/middleman-core/lib/middleman-core/templates/default.rb
index 088f63f1..6eea9b44 100644
--- a/middleman-core/lib/middleman-core/templates/default.rb
+++ b/middleman-core/lib/middleman-core/templates/default.rb
@@ -1,14 +1,14 @@
 # Default Middleman template
 class Middleman::Templates::Default < Middleman::Templates::Base
   class_option 'css_dir',
-               :default => 'stylesheets',
-               :desc    => 'The path to the css files'
+               default: 'stylesheets',
+               desc: 'The path to the css files'
   class_option 'js_dir',
-               :default => 'javascripts',
-               :desc    => 'The path to the javascript files'
+               default: 'javascripts',
+               desc: 'The path to the javascript files'
   class_option 'images_dir',
-               :default => 'images',
-               :desc    => 'The path to the image files'
+               default: 'images',
+               desc: 'The path to the image files'
 
   # Template files are relative to this file
   # @return [String]
diff --git a/middleman-core/lib/middleman-core/templates/extension/Rakefile b/middleman-core/lib/middleman-core/templates/extension/Rakefile
index 1b6d06aa..7910cf22 100644
--- a/middleman-core/lib/middleman-core/templates/extension/Rakefile
+++ b/middleman-core/lib/middleman-core/templates/extension/Rakefile
@@ -9,6 +9,6 @@ end
 
 require 'rake/clean'
 
-task :test => ['cucumber']
+task test: ['cucumber']
 
-task :default => :test
+task default: :test
diff --git a/middleman-core/lib/middleman-core/templates/html5.rb b/middleman-core/lib/middleman-core/templates/html5.rb
index 9ac75b3e..56422032 100644
--- a/middleman-core/lib/middleman-core/templates/html5.rb
+++ b/middleman-core/lib/middleman-core/templates/html5.rb
@@ -1,14 +1,14 @@
 # HTML5 Boilerplate template
 class Middleman::Templates::Html5 < Middleman::Templates::Base
   class_option 'css_dir',
-               :default => 'css',
-               :desc    => 'The path to the css files'
+               default: 'css',
+               desc: 'The path to the css files'
   class_option 'js_dir',
-               :default => 'js',
-               :desc    => 'The path to the javascript files'
+               default: 'js',
+               desc: 'The path to the javascript files'
   class_option 'images_dir',
-               :default => 'img',
-               :desc    => 'The path to the image files'
+               default: 'img',
+               desc: 'The path to the image files'
 
   # Templates are relative to this file
   # @return [String]
diff --git a/middleman-core/lib/middleman-core/templates/mobile.rb b/middleman-core/lib/middleman-core/templates/mobile.rb
index 43ebf6ca..8137c0dd 100644
--- a/middleman-core/lib/middleman-core/templates/mobile.rb
+++ b/middleman-core/lib/middleman-core/templates/mobile.rb
@@ -1,9 +1,9 @@
 # Mobile HTML5 Boilerplate
 class Middleman::Templates::Mobile < Middleman::Templates::Base
   # Slightly different paths
-  class_option :css_dir, :default => 'css'
-  class_option :js_dir, :default => 'js'
-  class_option :images_dir, :default => 'img'
+  class_option :css_dir, default: 'css'
+  class_option :js_dir, default: 'js'
+  class_option :images_dir, default: 'img'
 
   # Template files are relative to this file
   # @return [String]
diff --git a/middleman-core/lib/middleman-more/core_extensions/default_helpers.rb b/middleman-core/lib/middleman-more/core_extensions/default_helpers.rb
index ff0a5ffe..4b60bb65 100644
--- a/middleman-core/lib/middleman-more/core_extensions/default_helpers.rb
+++ b/middleman-core/lib/middleman-more/core_extensions/default_helpers.rb
@@ -6,6 +6,7 @@ require 'padrino-helpers'
 
 class Padrino::Helpers::OutputHelpers::ErbHandler
   # Force Erb capture not to use safebuffer
+  # rubocop:disable UnderscorePrefixedVariableName
   def capture_from_template(*args, &block)
     self.output_buffer, _buf_was = '', output_buffer
     raw = block.call(*args)
@@ -38,6 +39,7 @@ class Middleman::CoreExtensions::DefaultHelpers < ::Middleman::Extension
   helpers do
 
     # Make all block content html_safe
+    # rubocop:disable Semicolon
     def content_tag(name, content=nil, options=nil, &block)
       if block_given?
         options = content if content.is_a?(Hash)
diff --git a/middleman-core/lib/middleman-more/core_extensions/i18n.rb b/middleman-core/lib/middleman-more/core_extensions/i18n.rb
index 8c733eb2..f581f64c 100644
--- a/middleman-core/lib/middleman-more/core_extensions/i18n.rb
+++ b/middleman-core/lib/middleman-more/core_extensions/i18n.rb
@@ -55,10 +55,10 @@ class Middleman::CoreExtensions::Internationalization < ::Middleman::Extension
     end
   end
 
-  delegate :logger, :to => :app
+  delegate :logger, to: :app
 
   def langs
-    @_langs ||= get_known_languages
+    @_langs ||= known_languages
   end
 
   # Update the main sitemap resource list
@@ -115,7 +115,7 @@ class Middleman::CoreExtensions::Internationalization < ::Middleman::Extension
   end
 
   def metadata_for_path(url)
-    if d = get_localization_data(url)
+    if d = localization_data(url)
       lang, page_id = d
     else
       # Default to the @mount_at_root lang
@@ -129,18 +129,18 @@ class Middleman::CoreExtensions::Internationalization < ::Middleman::Extension
     end
 
     locals = {
-      :lang => lang,
-      :page_id => page_id
+      lang: lang,
+      page_id: page_id
     }
 
     {
-      :blocks => [instance_vars],
-      :locals => locals,
-      :options => { :lang => lang }
+      blocks: [instance_vars],
+      locals: locals,
+      options: { lang: lang }
     }
   end
 
-  def get_known_languages
+  def known_languages
     if options[:langs]
       Array(options[:langs]).map(&:to_sym)
     else
@@ -154,7 +154,7 @@ class Middleman::CoreExtensions::Internationalization < ::Middleman::Extension
     end
   end
 
-  def get_localization_data(path)
+  def localization_data(path)
     @_localization_data ||= {}
     @_localization_data[path]
   end
@@ -177,7 +177,7 @@ class Middleman::CoreExtensions::Internationalization < ::Middleman::Extension
   def build_resource(path, source_path, page_id, lang)
     old_locale = ::I18n.locale
     ::I18n.locale = lang
-    localized_page_id = ::I18n.t("paths.#{page_id}", :default => page_id, :fallback => [])
+    localized_page_id = ::I18n.t("paths.#{page_id}", default: page_id, fallback: [])
 
     prefix = if (options[:mount_at_root] == lang) || (options[:mount_at_root].nil? && langs[0] == lang)
       '/'
diff --git a/middleman-core/lib/middleman-more/extensions/asset_hash.rb b/middleman-core/lib/middleman-more/extensions/asset_hash.rb
index 5fca57ce..b087cff2 100644
--- a/middleman-core/lib/middleman-more/extensions/asset_hash.rb
+++ b/middleman-core/lib/middleman-more/extensions/asset_hash.rb
@@ -16,7 +16,7 @@ class Middleman::Extensions::AssetHash < ::Middleman::Extension
     # Allow specifying regexes to ignore, plus always ignore apple touch icons
     @ignore = Array(options.ignore) + [/^apple-touch-icon/]
 
-    app.use Middleware, :exts => options.exts, :middleman_app => app, :ignore => @ignore
+    app.use Middleware, exts: options.exts, middleman_app: app, ignore: @ignore
   end
 
   # Update the main sitemap resource list
diff --git a/middleman-core/lib/middleman-more/extensions/automatic_image_sizes.rb b/middleman-core/lib/middleman-more/extensions/automatic_image_sizes.rb
index 4885ebeb..594e374a 100644
--- a/middleman-core/lib/middleman-more/extensions/automatic_image_sizes.rb
+++ b/middleman-core/lib/middleman-more/extensions/automatic_image_sizes.rb
@@ -24,7 +24,7 @@ class Middleman::Extensions::AutomaticImageSizes < ::Middleman::Extension
 
         if File.exist?(full_path)
           begin
-            width, height = ::FastImage.size(full_path, :raise_on_failure => true)
+            width, height = ::FastImage.size(full_path, raise_on_failure: true)
             params[:width]  = width
             params[:height] = height
           rescue FastImage::UnknownImageType
diff --git a/middleman-core/lib/middleman-more/extensions/minify_css.rb b/middleman-core/lib/middleman-more/extensions/minify_css.rb
index e281d9b3..91cbf29a 100644
--- a/middleman-core/lib/middleman-more/extensions/minify_css.rb
+++ b/middleman-core/lib/middleman-more/extensions/minify_css.rb
@@ -14,15 +14,15 @@ class Middleman::Extensions::MinifyCss < ::Middleman::Extension
     chosen_compressor = app.config[:css_compressor] || options[:compressor] || SassCompressor
 
     # Setup Rack middleware to minify CSS
-    app.use Rack, :compressor => chosen_compressor,
-                  :ignore     => Array(options[:ignore]) + [/\.min\./],
-                  :inline     => options[:inline]
+    app.use Rack, compressor: chosen_compressor,
+                  ignore: Array(options[:ignore]) + [/\.min\./],
+                  inline: options[:inline]
   end
 
   class SassCompressor
     def self.compress(style, options={})
       root_node = ::Sass::SCSS::CssParser.new(style, 'middleman-css-input', 1).parse
-      root_node.options = options.merge(:style => :compressed)
+      root_node.options = options.merge(style: :compressed)
       root_node.render.strip
     end
   end
diff --git a/middleman-core/lib/middleman-more/extensions/minify_javascript.rb b/middleman-core/lib/middleman-more/extensions/minify_javascript.rb
index f0528391..d51d864f 100644
--- a/middleman-core/lib/middleman-more/extensions/minify_javascript.rb
+++ b/middleman-core/lib/middleman-more/extensions/minify_javascript.rb
@@ -17,9 +17,9 @@ class Middleman::Extensions::MinifyJavascript < ::Middleman::Extension
     end
 
     # Setup Rack middleware to minify CSS
-    app.use Rack, :compressor => chosen_compressor,
-                  :ignore     => Array(options[:ignore]) + [/\.min\./],
-                  :inline     => options[:inline]
+    app.use Rack, compressor: chosen_compressor,
+                  ignore: Array(options[:ignore]) + [/\.min\./],
+                  inline: options[:inline]
   end
 
   # Rack middleware to look for JS and compress it
diff --git a/middleman-core/lib/middleman-more/templates/smacss.rb b/middleman-core/lib/middleman-more/templates/smacss.rb
index 88e14d53..ecb314d0 100644
--- a/middleman-core/lib/middleman-more/templates/smacss.rb
+++ b/middleman-core/lib/middleman-more/templates/smacss.rb
@@ -1,14 +1,14 @@
 # SMACSS
 class Middleman::Templates::Smacss < Middleman::Templates::Base
   class_option 'css_dir',
-               :default => 'stylesheets',
-               :desc    => 'The path to the css files'
+               default: 'stylesheets',
+               desc: 'The path to the css files'
   class_option 'js_dir',
-               :default => 'javascripts',
-               :desc    => 'The path to the javascript files'
+               default: 'javascripts',
+               desc: 'The path to the javascript files'
   class_option 'images_dir',
-               :default => 'images',
-               :desc    => 'The path to the image files'
+               default: 'images',
+               desc: 'The path to the image files'
 
   # Template files are relative to this file
   # @return [String]