diff --git a/CHANGELOG.md b/CHANGELOG.md
index 724499e6..9d026e8c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -28,6 +28,22 @@ master
 * Remove old module-style extension support
 * Placed all `config.rb` evaluation inside the `ConfigContext` class
 
+3.3.5
+===
+
+* Update Padrino to ~> 0.12.3 (removed breadcrumb helper)
+* Update compass-import-once to 1.0.5
+* Fix issue with Slim partials. #1327
+
+3.3.4
+===
+
+* Fix `automatic_alt_tags` error. #1341
+* `partial` now looks for i18n suffixed filenames. #1333
+* Allow excluding paths from `gzip`. #1268
+* Let LiveReload work on 404 pages.
+* Update `listen` dependency.
+
 3.3.3
 ===
 
diff --git a/Gemfile b/Gemfile
index 7d0c73df..1668ca87 100644
--- a/Gemfile
+++ b/Gemfile
@@ -23,7 +23,7 @@ gem 'liquid', '>= 2.6', require: false
 gem 'stylus', '>= 1.0', require: false
 gem 'sinatra', '>= 1.4', require: false
 gem 'redcarpet', '>= 3.1', require: false unless RUBY_ENGINE == 'jruby'
-gem 'asciidoctor', '>= 0.1', require: false
+gem 'asciidoctor', '~> 0.1', require: false
 
 # For less, note there is no compatible JS runtime for windows
 gem 'therubyrhino', '>= 2.0', platforms: :jruby
diff --git a/middleman-core/features/automatic_alt_tags.feature b/middleman-core/features/automatic_alt_tags.feature
new file mode 100644
index 00000000..12e84459
--- /dev/null
+++ b/middleman-core/features/automatic_alt_tags.feature
@@ -0,0 +1,8 @@
+Feature: Automatically detect and insert image dimensions into tags
+  In order to speed up development and appease YSlow
+
+  Scenario: Rendering an image with the feature enabled
+    Given "automatic_alt_tags" feature is "enabled"
+    And the Server is running at "automatic-alt-tags-app"
+    When I go to "/auto-image-sizes.html"
+    Then I should see 'alt="Blank"'
\ No newline at end of file
diff --git a/middleman-core/features/i18n_partials.feature b/middleman-core/features/i18n_partials.feature
new file mode 100644
index 00000000..f4f947c0
--- /dev/null
+++ b/middleman-core/features/i18n_partials.feature
@@ -0,0 +1,23 @@
+Feature: i18n Partials
+
+  Scenario: Running localize with the default config
+    Given a fixture app "i18n-test-app"
+    And a file named "config.rb" with:
+      """
+      activate :i18n
+      """
+    Given the Server is running at "i18n-test-app"
+    When I go to "/partials/index.html"
+    Then I should see "Country: USA"
+    Then I should see "State: District of Columbia"
+    Then I should see "Greeting: Hello"
+    Then I should see "Site: Locale Site"
+    Then I should see "Flag: stars"
+    Then I should see "President: obama"
+    When I go to "/es/partials/index.html"
+    Then I should see "Country: Mexico"
+    Then I should see "State: Distrito Federal"
+    Then I should see "Greeting: Hola"
+    Then I should see "Site: Locale Site"
+    Then I should see "Flag: bars"
+    Then I should see "President: nieto"
\ No newline at end of file
diff --git a/middleman-core/features/partials.feature b/middleman-core/features/partials.feature
index 76a7e75a..965215a9 100644
--- a/middleman-core/features/partials.feature
+++ b/middleman-core/features/partials.feature
@@ -49,3 +49,9 @@ Feature: Provide Sane Defaults for Partial Behavior
     Given the Server is running at "partials-app"
     When I go to "/svg.html"
     Then I should see "<svg"
+    When I go to "/static_underscore.html"
+    Then I should see "<p>Hello World</p>"
+    When I go to "/code_snippet.html"
+    Then I should see "File Not Found"
+    When I go to "/_code_snippet.html"
+    Then I should see "File Not Found"
diff --git a/middleman-core/features/slim.feature b/middleman-core/features/slim.feature
index 62471060..32c4a344 100644
--- a/middleman-core/features/slim.feature
+++ b/middleman-core/features/slim.feature
@@ -19,3 +19,63 @@ Feature: Support slim templating language
     And the Server is running at "empty_app"
     When I go to "/slim.html"
     Then I should see "<h1>Welcome to Slim</h1>"
+
+  Scenario: Slim Content For
+    Given the Server is running at "slim-content-for-app"
+    When I go to "/index.html"
+    Then I should not see "Content AContent B"
+    Then I should see "Content for A:Content A"
+    Then I should see "Content for main:Content Main"
+    Then I should see "Content for B:Content B"
+
+  Scenario: Rendering Scss in a Slim filter
+    Given an empty app
+    And a file named "config.rb" with:
+      """
+      """
+    And a file named "source/scss.html.slim" with:
+      """
+      doctype 5
+      html lang='en'
+        head
+          meta charset="utf-8"
+          scss:
+            @mixin global-reset {
+              html, body, div {
+                padding: 0;
+              }
+            }
+            @include global-reset;
+        body
+          h1 Welcome to Slim
+      """
+    And a file named "source/sass.html.slim" with:
+      """
+      doctype 5
+      html lang='en'
+        head
+          meta charset="utf-8"
+          sass:
+            html, body, div
+              padding: 0
+        body
+          h1 Welcome to Slim
+      """
+    And a file named "source/error.html.slim" with:
+      """
+      doctype 5
+      html lang='en'
+        head
+          meta charset="utf-8"
+          scss:
+            +global-reset2
+        body
+          h1 Welcome to Slim
+      """
+    And the Server is running at "empty_app"
+    When I go to "/scss.html"
+    Then I should see "html,body,div"
+    When I go to "/sass.html"
+    Then I should see "html,body,div"
+    When I go to "/error.html"
+    Then I should see "Syntax error"
diff --git a/middleman-core/fixtures/automatic-alt-tags-app/config.rb b/middleman-core/fixtures/automatic-alt-tags-app/config.rb
new file mode 100644
index 00000000..e69de29b
diff --git a/middleman-core/fixtures/automatic-alt-tags-app/source/auto-image-sizes.html.erb b/middleman-core/fixtures/automatic-alt-tags-app/source/auto-image-sizes.html.erb
new file mode 100755
index 00000000..fb441334
--- /dev/null
+++ b/middleman-core/fixtures/automatic-alt-tags-app/source/auto-image-sizes.html.erb
@@ -0,0 +1 @@
+<%= image_tag "blank.gif" %>
\ No newline at end of file
diff --git a/middleman-core/fixtures/automatic-alt-tags-app/source/images/blank.gif b/middleman-core/fixtures/automatic-alt-tags-app/source/images/blank.gif
new file mode 100755
index 00000000..2498f1aa
Binary files /dev/null and b/middleman-core/fixtures/automatic-alt-tags-app/source/images/blank.gif differ
diff --git a/middleman-core/fixtures/i18n-test-app/source/_country.en.erb b/middleman-core/fixtures/i18n-test-app/source/_country.en.erb
new file mode 100644
index 00000000..e14a77cb
--- /dev/null
+++ b/middleman-core/fixtures/i18n-test-app/source/_country.en.erb
@@ -0,0 +1 @@
+USA
\ No newline at end of file
diff --git a/middleman-core/fixtures/i18n-test-app/source/_country.es.erb b/middleman-core/fixtures/i18n-test-app/source/_country.es.erb
new file mode 100644
index 00000000..1da91630
--- /dev/null
+++ b/middleman-core/fixtures/i18n-test-app/source/_country.es.erb
@@ -0,0 +1 @@
+Mexico
\ No newline at end of file
diff --git a/middleman-core/fixtures/i18n-test-app/source/_site.erb b/middleman-core/fixtures/i18n-test-app/source/_site.erb
new file mode 100644
index 00000000..46964e75
--- /dev/null
+++ b/middleman-core/fixtures/i18n-test-app/source/_site.erb
@@ -0,0 +1 @@
+Locale Site
\ No newline at end of file
diff --git a/middleman-core/fixtures/i18n-test-app/source/images/president.en.svg b/middleman-core/fixtures/i18n-test-app/source/images/president.en.svg
new file mode 100644
index 00000000..9a301b6a
--- /dev/null
+++ b/middleman-core/fixtures/i18n-test-app/source/images/president.en.svg
@@ -0,0 +1 @@
+obama
\ No newline at end of file
diff --git a/middleman-core/fixtures/i18n-test-app/source/images/president.es.svg b/middleman-core/fixtures/i18n-test-app/source/images/president.es.svg
new file mode 100644
index 00000000..443f1666
--- /dev/null
+++ b/middleman-core/fixtures/i18n-test-app/source/images/president.es.svg
@@ -0,0 +1 @@
+nieto
\ No newline at end of file
diff --git a/middleman-core/fixtures/i18n-test-app/source/localizable/_state.en.erb b/middleman-core/fixtures/i18n-test-app/source/localizable/_state.en.erb
new file mode 100644
index 00000000..0a766884
--- /dev/null
+++ b/middleman-core/fixtures/i18n-test-app/source/localizable/_state.en.erb
@@ -0,0 +1 @@
+District of Columbia
\ No newline at end of file
diff --git a/middleman-core/fixtures/i18n-test-app/source/localizable/_state.es.erb b/middleman-core/fixtures/i18n-test-app/source/localizable/_state.es.erb
new file mode 100644
index 00000000..49c5d37e
--- /dev/null
+++ b/middleman-core/fixtures/i18n-test-app/source/localizable/_state.es.erb
@@ -0,0 +1 @@
+Distrito Federal
\ No newline at end of file
diff --git a/middleman-core/fixtures/i18n-test-app/source/localizable/images/flag.en.svg b/middleman-core/fixtures/i18n-test-app/source/localizable/images/flag.en.svg
new file mode 100644
index 00000000..118f7d33
--- /dev/null
+++ b/middleman-core/fixtures/i18n-test-app/source/localizable/images/flag.en.svg
@@ -0,0 +1 @@
+stars
\ No newline at end of file
diff --git a/middleman-core/fixtures/i18n-test-app/source/localizable/images/flag.es.svg b/middleman-core/fixtures/i18n-test-app/source/localizable/images/flag.es.svg
new file mode 100644
index 00000000..541204ba
--- /dev/null
+++ b/middleman-core/fixtures/i18n-test-app/source/localizable/images/flag.es.svg
@@ -0,0 +1 @@
+bars
\ No newline at end of file
diff --git a/middleman-core/fixtures/i18n-test-app/source/localizable/partials/_greeting.en.erb b/middleman-core/fixtures/i18n-test-app/source/localizable/partials/_greeting.en.erb
new file mode 100644
index 00000000..5ab2f8a4
--- /dev/null
+++ b/middleman-core/fixtures/i18n-test-app/source/localizable/partials/_greeting.en.erb
@@ -0,0 +1 @@
+Hello
\ No newline at end of file
diff --git a/middleman-core/fixtures/i18n-test-app/source/localizable/partials/_greeting.es.erb b/middleman-core/fixtures/i18n-test-app/source/localizable/partials/_greeting.es.erb
new file mode 100644
index 00000000..af5a0623
--- /dev/null
+++ b/middleman-core/fixtures/i18n-test-app/source/localizable/partials/_greeting.es.erb
@@ -0,0 +1 @@
+Hola
\ No newline at end of file
diff --git a/middleman-core/fixtures/i18n-test-app/source/localizable/partials/index.html.erb b/middleman-core/fixtures/i18n-test-app/source/localizable/partials/index.html.erb
new file mode 100644
index 00000000..7369572a
--- /dev/null
+++ b/middleman-core/fixtures/i18n-test-app/source/localizable/partials/index.html.erb
@@ -0,0 +1,6 @@
+Site: <%= partial :site %>
+Country: <%= partial :country %>
+Greeting: <%= partial :greeting %>
+State: <%= partial :state %>
+Flag: <%= partial "images/flag.svg" %>
+President: <%= partial "images/president.svg" %>
\ No newline at end of file
diff --git a/middleman-core/fixtures/partials-app/source/_code_snippet.html b/middleman-core/fixtures/partials-app/source/_code_snippet.html
new file mode 100644
index 00000000..92f9a3de
--- /dev/null
+++ b/middleman-core/fixtures/partials-app/source/_code_snippet.html
@@ -0,0 +1 @@
+<p>Hello World</p>
\ No newline at end of file
diff --git a/middleman-core/fixtures/partials-app/source/static_underscore.html.erb b/middleman-core/fixtures/partials-app/source/static_underscore.html.erb
new file mode 100644
index 00000000..911d816d
--- /dev/null
+++ b/middleman-core/fixtures/partials-app/source/static_underscore.html.erb
@@ -0,0 +1 @@
+<%= partial "code_snippet.html" %>
\ No newline at end of file
diff --git a/middleman-core/fixtures/slim-content-for-app/config.rb b/middleman-core/fixtures/slim-content-for-app/config.rb
new file mode 100755
index 00000000..e69de29b
diff --git a/middleman-core/fixtures/slim-content-for-app/source/index.html.slim b/middleman-core/fixtures/slim-content-for-app/source/index.html.slim
new file mode 100755
index 00000000..8a61ffff
--- /dev/null
+++ b/middleman-core/fixtures/slim-content-for-app/source/index.html.slim
@@ -0,0 +1,7 @@
+- content_for :a do
+  | Content A
+
+| Content Main
+
+- content_for :b do
+  | Content B
diff --git a/middleman-core/fixtures/slim-content-for-app/source/layouts/layout.slim b/middleman-core/fixtures/slim-content-for-app/source/layouts/layout.slim
new file mode 100755
index 00000000..160a7646
--- /dev/null
+++ b/middleman-core/fixtures/slim-content-for-app/source/layouts/layout.slim
@@ -0,0 +1,15 @@
+doctype html
+html
+  body
+    .test
+    | Content for A:
+    == yield_content :a
+    br
+
+    | Content for main:
+    == yield
+    br
+
+    | Content for B:
+    == yield_content :b
+    br
diff --git a/middleman-core/lib/middleman-core/builder.rb b/middleman-core/lib/middleman-core/builder.rb
index 0af4f471..0e745ea7 100644
--- a/middleman-core/lib/middleman-core/builder.rb
+++ b/middleman-core/lib/middleman-core/builder.rb
@@ -16,7 +16,7 @@ module Middleman
     def_delegator :@app, :logger
 
     # Sort order, images, fonts, js/css and finally everything else.
-    SORT_ORDER = %w(.png .jpeg .jpg .gif .bmp .svg .svgz .ico .woff .otf .ttf .eot .js .css)
+    SORT_ORDER = %w(.png .jpeg .jpg .gif .bmp .svg .svgz .webp .ico .woff .otf .ttf .eot .js .css)
 
     # Create a new Builder instance.
     # @param [Middleman::Application] app The app to build.
diff --git a/middleman-core/lib/middleman-core/core_extensions/default_helpers.rb b/middleman-core/lib/middleman-core/core_extensions/default_helpers.rb
index 8c6b0ca2..39019beb 100644
--- a/middleman-core/lib/middleman-core/core_extensions/default_helpers.rb
+++ b/middleman-core/lib/middleman-core/core_extensions/default_helpers.rb
@@ -29,7 +29,6 @@ class Middleman::CoreExtensions::DefaultHelpers < ::Middleman::Extension
     ::Middleman::TemplateContext.send :include, ::Padrino::Helpers::RenderHelpers
     ::Middleman::TemplateContext.send :include, ::Padrino::Helpers::NumberHelpers
     # ::Middleman::TemplateContext.send :include, ::Padrino::Helpers::TranslationHelpers
-    ::Middleman::TemplateContext.send :include, ::Padrino::Helpers::Breadcrumbs
 
     app.config.define_setting :relative_links, false, 'Whether to generate relative links instead of absolute ones'
   end
diff --git a/middleman-core/lib/middleman-core/core_extensions/i18n.rb b/middleman-core/lib/middleman-core/core_extensions/i18n.rb
index 3b24552b..896ccf3f 100644
--- a/middleman-core/lib/middleman-core/core_extensions/i18n.rb
+++ b/middleman-core/lib/middleman-core/core_extensions/i18n.rb
@@ -40,6 +40,33 @@ class Middleman::CoreExtensions::Internationalization < ::Middleman::Extension
     def t(*args)
       ::I18n.t(*args)
     end
+
+    def locate_partial(partial_name)
+      locals_dir = extensions[:i18n].options[:templates_dir]
+
+      # Try /localizable
+      partials_path = File.join(locals_dir, partial_name)
+
+      lang_suffix = current_resource.metadata[:locals] && current_resource.metadata[:locals][:lang]
+
+      extname = File.extname(partial_name)
+      maybe_static = extname.length > 0
+      suffixed_partial_name = if maybe_static
+        partial_name.sub(extname, ".#{lang_suffix}#{extname}")
+      else
+        "#{partial_name}.#{lang_suffix}"
+      end
+
+      if lang_suffix
+        super(suffixed_partial_name) ||
+        super(File.join(locals_dir, suffixed_partial_name)) ||
+        super(partials_path) ||
+        super
+      else
+        super(partials_path) ||
+        super
+      end
+    end
   end
 
   Contract None => ArrayOf[Symbol]
diff --git a/middleman-core/lib/middleman-core/extensions/asset_hash.rb b/middleman-core/lib/middleman-core/extensions/asset_hash.rb
index ae4801c2..48ca8f92 100644
--- a/middleman-core/lib/middleman-core/extensions/asset_hash.rb
+++ b/middleman-core/lib/middleman-core/extensions/asset_hash.rb
@@ -1,7 +1,7 @@
 require 'middleman-core/util'
 
 class Middleman::Extensions::AssetHash < ::Middleman::Extension
-  option :exts, %w(.jpg .jpeg .png .gif .js .css .otf .woff .eot .ttf .svg), 'List of extensions that get asset hashes appended to them.'
+  option :exts, %w(.jpg .jpeg .png .gif .webp .js .css .otf .woff .eot .ttf .svg), 'List of extensions that get asset hashes appended to them.'
   option :ignore, [], 'Regexes of filenames to skip adding asset hashes to'
 
   def initialize(app, options_hash={}, &block)
diff --git a/middleman-core/lib/middleman-core/extensions/asset_host.rb b/middleman-core/lib/middleman-core/extensions/asset_host.rb
index 07aac381..be161501 100644
--- a/middleman-core/lib/middleman-core/extensions/asset_host.rb
+++ b/middleman-core/lib/middleman-core/extensions/asset_host.rb
@@ -2,7 +2,7 @@ require 'middleman-core/middleware/inline_url_rewriter'
 
 class Middleman::Extensions::AssetHost < ::Middleman::Extension
   option :host, nil, 'The asset host to use or a Proc to determine asset host', required: true
-  option :exts, %w(.css .png .jpg .jpeg .svg .svgz .js .gif), 'List of extensions that get cache busters strings appended to them.'
+  option :exts, %w(.css .png .jpg .jpeg .webp .svg .svgz .js .gif), 'List of extensions that get cache busters strings appended to them.'
   option :sources, %w(.htm .html .php .css .js), 'List of extensions that are searched for bustable assets.'
   option :ignore, [], 'Regexes of filenames to skip adding query strings to'
 
diff --git a/middleman-core/lib/middleman-core/extensions/automatic_alt_tags.rb b/middleman-core/lib/middleman-core/extensions/automatic_alt_tags.rb
index 84d23b13..dcbcb04c 100644
--- a/middleman-core/lib/middleman-core/extensions/automatic_alt_tags.rb
+++ b/middleman-core/lib/middleman-core/extensions/automatic_alt_tags.rb
@@ -1,19 +1,15 @@
 # Automatic Image alt tags from image names extension
 class Middleman::Extensions::AutomaticAltTags < ::Middleman::Extension
-  def initialize(app, options_hash={}, &block)
-    super
-  end
-
   helpers do
     # Override default image_tag helper to automatically insert alt tag
     # containing image name.
 
-    def image_tag(path)
+    def image_tag(path, params={})
       unless path.include?('://')
         params[:alt] ||= ''
 
         real_path = path.dup
-        real_path = File.join(images_dir, real_path) unless real_path.start_with?('/')
+        real_path = File.join(config[:images_dir], real_path) unless real_path.start_with?('/')
 
         file = app.files.find(:source, real_path)
 
@@ -26,7 +22,7 @@ class Middleman::Extensions::AutomaticAltTags < ::Middleman::Extension
         end
       end
 
-      super(path)
+      super(path, params)
     end
   end
 end
diff --git a/middleman-core/lib/middleman-core/extensions/cache_buster.rb b/middleman-core/lib/middleman-core/extensions/cache_buster.rb
index 24536f95..7cc41a36 100644
--- a/middleman-core/lib/middleman-core/extensions/cache_buster.rb
+++ b/middleman-core/lib/middleman-core/extensions/cache_buster.rb
@@ -1,6 +1,6 @@
 # The Cache Buster extension
 class Middleman::Extensions::CacheBuster < ::Middleman::Extension
-  option :exts, %w(.css .png .jpg .jpeg .svg .svgz .js .gif), 'List of extensions that get cache busters strings appended to them.'
+  option :exts, %w(.css .png .jpg .jpeg .webp .svg .svgz .js .gif), 'List of extensions that get cache busters strings appended to them.'
   option :sources, %w(.htm .html .php .css .js), 'List of extensions that are searched for bustable assets.'
   option :ignore, [], 'Regexes of filenames to skip adding query strings to'
 
diff --git a/middleman-core/lib/middleman-core/extensions/relative_assets.rb b/middleman-core/lib/middleman-core/extensions/relative_assets.rb
index f5e8a499..817119ca 100644
--- a/middleman-core/lib/middleman-core/extensions/relative_assets.rb
+++ b/middleman-core/lib/middleman-core/extensions/relative_assets.rb
@@ -1,6 +1,6 @@
 # Relative Assets extension
 class Middleman::Extensions::RelativeAssets < ::Middleman::Extension
-  option :exts, %w(.css .png .jpg .jpeg .svg .svgz .js .gif .ttf .otf .woff), 'List of extensions that get cache busters strings appended to them.'
+  option :exts, %w(.css .png .jpg .jpeg .webp .svg .svgz .js .gif .ttf .otf .woff), 'List of extensions that get cache busters strings appended to them.'
   option :sources, %w(.htm .html .css), 'List of extensions that are searched for relative assets.'
   option :ignore, [], 'Regexes of filenames to skip adding query strings to'
 
diff --git a/middleman-core/lib/middleman-core/step_definitions/server_steps.rb b/middleman-core/lib/middleman-core/step_definitions/server_steps.rb
index eccf3331..a2c0da39 100644
--- a/middleman-core/lib/middleman-core/step_definitions/server_steps.rb
+++ b/middleman-core/lib/middleman-core/step_definitions/server_steps.rb
@@ -101,6 +101,14 @@ Then /^I should not see content matching %r{(.*)}$/ do |expected|
   expect(@last_response.body).to_not match(expected)
 end
 
+Then /^I should not see:$/ do |expected|
+  expect(@browser.last_response.body).to_not include(expected.chomp)
+end
+
+Then /^the status code should be "([^\"]*)"$/ do |expected|
+  expect(@browser.last_response.status).to eq expected.to_i
+end
+
 Then /^I should see "([^\"]*)" lines$/ do |lines|
   expect(@last_response.body.chomp.split($/).length).to eq(lines.to_i)
 end
diff --git a/middleman-core/lib/middleman-core/template_context.rb b/middleman-core/lib/middleman-core/template_context.rb
index 38732719..921ebc3e 100644
--- a/middleman-core/lib/middleman-core/template_context.rb
+++ b/middleman-core/lib/middleman-core/template_context.rb
@@ -104,10 +104,11 @@ module Middleman
 
       raise ::Middleman::TemplateRenderer::TemplateNotFound, "Could not locate partial: #{name}" unless partial_file
 
-      r = sitemap.find_resource_by_path(sitemap.file_to_path(partial_file))
+      source_path = sitemap.file_to_path(partial_file)
+      r = sitemap.find_resource_by_path(source_path)
 
-      if r && !r.template?
-        File.read(r.source_file[:full_path])
+      if (r && !r.template?) || (Tilt[partial_file[:full_path]].nil? && partial_file[:full_path].exist?)
+        File.read(partial_file[:full_path])
       else
         opts = options.dup
         locs = opts.delete(:locals)
@@ -116,8 +117,6 @@ module Middleman
       end
     end
 
-    protected
-
     # Locate a partial relative to the current path or the source dir, given a partial's path.
     #
     # @api private
@@ -140,6 +139,7 @@ module Middleman
       [
         [relative_dir.to_s, { preferred_engine: resource.source_file[:relative_path].extname[1..-1].to_sym }],
         [non_root],
+        [non_root, { try_static: true }],
         [relative_dir_no_underscore.to_s, { try_static: true }],
         [non_root_no_underscore, { try_static: true }]
       ].each do |args|
@@ -147,9 +147,11 @@ module Middleman
         break if partial_file
       end
 
-      partial_file
+      partial_file || nil
     end
 
+    protected
+
     # Render a path with locs, opts and contents block.
     #
     # @api private
diff --git a/middleman-core/middleman-core.gemspec b/middleman-core/middleman-core.gemspec
index 2bced4f9..f8735917 100644
--- a/middleman-core/middleman-core.gemspec
+++ b/middleman-core/middleman-core.gemspec
@@ -27,7 +27,7 @@ Gem::Specification.new do |s|
 
   # Helpers
   s.add_dependency('activesupport', ['~> 4.1.0'])
-  s.add_dependency("padrino-helpers", ['~> 0.12.1'])
+  s.add_dependency('padrino-helpers', ['~> 0.12.3'])
 
   # Watcher
   s.add_dependency('listen', ['>= 2.7.9', '< 3.0'])