diff --git a/Gemfile b/Gemfile
index b8866d33..5e98142c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,42 +1,42 @@
 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"
-gem "fivemat"
-gem "aruba",    "~> 0.5.1"
-gem "rspec",    "~> 2.12"
-gem "simplecov"
+gem 'cucumber', '~> 1.3.1'
+gem 'fivemat'
+gem 'aruba',    '~> 0.5.1'
+gem 'rspec',    '~> 2.12'
+gem 'simplecov'
 
 # Optional middleman dependencies, included for tests
-gem "haml", "~> 4.0.0", :require => false # Make sure to use Haml 4 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 'haml', '~> 4.0.0', :require => false # Make sure to use Haml 4 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
 
 platforms :ruby do
-  gem "therubyracer"
-  gem "redcarpet", "~> 3.0"
-  gem "pry", :require => false, :group => :development
-  gem "pry-debugger", :require => false, :group => :development
+  gem 'therubyracer'
+  gem 'redcarpet', '~> 3.0'
+  gem 'pry', :require => false, :group => :development
+  gem 'pry-debugger', :require => false, :group => :development
 end
 
 platforms :jruby do
-  gem "therubyrhino"
+  gem 'therubyrhino'
 end
 
 # Code Quality
-gem "cane", :platforms => [:mri_19, :mri_20], :require => false
+gem 'cane', :platforms => [:mri_19, :mri_20], :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/middleman-core/lib/middleman-core/templates/extension/Gemfile b/middleman-core/lib/middleman-core/templates/extension/Gemfile
index b3031953..6959cfc1 100644
--- a/middleman-core/lib/middleman-core/templates/extension/Gemfile
+++ b/middleman-core/lib/middleman-core/templates/extension/Gemfile
@@ -6,14 +6,14 @@ source 'http://rubygems.org'
 gemspec
 
 group :development do
-  gem "rake"
-  gem "rdoc"
-  gem "yard"
+  gem 'rake'
+  gem 'rdoc'
+  gem 'yard'
 end
 
 group :test do
-  gem "cucumber"
-  gem "fivemat"
-  gem "aruba"
-  gem "rspec"
+  gem 'cucumber'
+  gem 'fivemat'
+  gem 'aruba'
+  gem 'rspec'
 end
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