diff --git a/.rubocop.yml b/.rubocop.yml
index e3ec95fcfa..9436e9c888 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -2,11 +2,11 @@ AllCops:
   TargetRubyVersion: 2.1
   Include:
     - Dangerfile
-    - gemfiles/*.gemfile
 
   Exclude:
     - vendor/**/*
     - bin/**/*
+    - gemfiles/*.gemfile
 
 inherit_from: .rubocop_todo.yml
 
diff --git a/gemfiles/rack_1.5.2.gemfile b/gemfiles/rack_1.5.2.gemfile
index 632a14311c..8b029051dd 100644
--- a/gemfiles/rack_1.5.2.gemfile
+++ b/gemfiles/rack_1.5.2.gemfile
@@ -1,35 +1,36 @@
 # This file was generated by Appraisal
 
-source 'https://rubygems.org'
+source "https://rubygems.org"
 
-gem 'rack', '1.5.2'
+gem "rack", "1.5.2"
 
 group :development, :test do
-  gem 'bundler'
-  gem 'rake'
-  gem 'rubocop', '0.47.0'
+  gem "bundler"
+  gem "rake"
+  gem "rubocop", "0.47.0"
+  gem "hashie", :require => false
 end
 
 group :development do
-  gem 'guard'
-  gem 'guard-rspec'
-  gem 'guard-rubocop'
-  gem 'yard'
-  gem 'appraisal'
-  gem 'benchmark-ips'
-  gem 'redcarpet'
+  gem "guard"
+  gem "guard-rspec"
+  gem "guard-rubocop"
+  gem "yard"
+  gem "appraisal"
+  gem "benchmark-ips"
+  gem "redcarpet"
 end
 
 group :test do
-  gem 'grape-entity', '~> 0.6'
-  gem 'maruku'
-  gem 'rack-test'
-  gem 'rspec', '~> 3.0'
-  gem 'cookiejar'
-  gem 'rack-jsonp', require: 'rack/jsonp'
-  gem 'mime-types'
-  gem 'ruby-grape-danger', '~> 0.1.0', require: false
-  gem 'coveralls', '~> 0.8.17', require: false
+  gem "grape-entity", "~> 0.6"
+  gem "maruku"
+  gem "rack-test"
+  gem "rspec", "~> 3.0"
+  gem "cookiejar"
+  gem "rack-jsonp", :require => "rack/jsonp"
+  gem "mime-types"
+  gem "ruby-grape-danger", "~> 0.1.0", :require => false
+  gem "coveralls", "~> 0.8.17", :require => false
 end
 
-gemspec path: '../'
+gemspec :path => "../"
diff --git a/gemfiles/rack_edge.gemfile b/gemfiles/rack_edge.gemfile
index b05ce40319..b1aed07e9f 100644
--- a/gemfiles/rack_edge.gemfile
+++ b/gemfiles/rack_edge.gemfile
@@ -1,35 +1,36 @@
 # This file was generated by Appraisal
 
-source 'https://rubygems.org'
+source "https://rubygems.org"
 
-gem 'rack', github: 'rack/rack'
+gem "rack", :github => "rack/rack"
 
 group :development, :test do
-  gem 'bundler'
-  gem 'rake'
-  gem 'rubocop', '0.47.0'
+  gem "bundler"
+  gem "rake"
+  gem "rubocop", "0.47.0"
+  gem "hashie", :require => false
 end
 
 group :development do
-  gem 'guard'
-  gem 'guard-rspec'
-  gem 'guard-rubocop'
-  gem 'yard'
-  gem 'appraisal'
-  gem 'benchmark-ips'
-  gem 'redcarpet'
+  gem "guard"
+  gem "guard-rspec"
+  gem "guard-rubocop"
+  gem "yard"
+  gem "appraisal"
+  gem "benchmark-ips"
+  gem "redcarpet"
 end
 
 group :test do
-  gem 'grape-entity', '~> 0.6'
-  gem 'maruku'
-  gem 'rack-test'
-  gem 'rspec', '~> 3.0'
-  gem 'cookiejar'
-  gem 'rack-jsonp', require: 'rack/jsonp'
-  gem 'mime-types'
-  gem 'ruby-grape-danger', '~> 0.1.0', require: false
-  gem 'coveralls', '~> 0.8.17', require: false
+  gem "grape-entity", "~> 0.6"
+  gem "maruku"
+  gem "rack-test"
+  gem "rspec", "~> 3.0"
+  gem "cookiejar"
+  gem "rack-jsonp", :require => "rack/jsonp"
+  gem "mime-types"
+  gem "ruby-grape-danger", "~> 0.1.0", :require => false
+  gem "coveralls", "~> 0.8.17", :require => false
 end
 
-gemspec path: '../'
+gemspec :path => "../"
diff --git a/gemfiles/rails_3.gemfile b/gemfiles/rails_3.gemfile
index 705be15125..ccc32e687e 100644
--- a/gemfiles/rails_3.gemfile
+++ b/gemfiles/rails_3.gemfile
@@ -1,36 +1,37 @@
 # This file was generated by Appraisal
 
-source 'https://rubygems.org'
+source "https://rubygems.org"
 
-gem 'rails', '3.2.19'
-gem 'rack-cache', '<= 1.2'
+gem "rails", "3.2.19"
+gem "rack-cache", "<= 1.2"
 
 group :development, :test do
-  gem 'bundler'
-  gem 'rake'
-  gem 'rubocop', '0.47.0'
+  gem "bundler"
+  gem "rake"
+  gem "rubocop", "0.47.0"
+  gem "hashie", :require => false
 end
 
 group :development do
-  gem 'guard'
-  gem 'guard-rspec'
-  gem 'guard-rubocop'
-  gem 'yard'
-  gem 'appraisal'
-  gem 'benchmark-ips'
-  gem 'redcarpet'
+  gem "guard"
+  gem "guard-rspec"
+  gem "guard-rubocop"
+  gem "yard"
+  gem "appraisal"
+  gem "benchmark-ips"
+  gem "redcarpet"
 end
 
 group :test do
-  gem 'grape-entity', '~> 0.6'
-  gem 'maruku'
-  gem 'rack-test'
-  gem 'rspec', '~> 3.0'
-  gem 'cookiejar'
-  gem 'rack-jsonp', require: 'rack/jsonp'
-  gem 'mime-types'
-  gem 'ruby-grape-danger', '~> 0.1.0', require: false
-  gem 'coveralls', '~> 0.8.17', require: false
+  gem "grape-entity", "~> 0.6"
+  gem "maruku"
+  gem "rack-test"
+  gem "rspec", "~> 3.0"
+  gem "cookiejar"
+  gem "rack-jsonp", :require => "rack/jsonp"
+  gem "mime-types"
+  gem "ruby-grape-danger", "~> 0.1.0", :require => false
+  gem "coveralls", "~> 0.8.17", :require => false
 end
 
-gemspec path: '../'
+gemspec :path => "../"
diff --git a/gemfiles/rails_4.gemfile b/gemfiles/rails_4.gemfile
index c3dc4ae0ad..5c005592e4 100644
--- a/gemfiles/rails_4.gemfile
+++ b/gemfiles/rails_4.gemfile
@@ -1,35 +1,36 @@
 # This file was generated by Appraisal
 
-source 'https://rubygems.org'
+source "https://rubygems.org"
 
-gem 'rails', '4.1.6'
+gem "rails", "4.1.6"
 
 group :development, :test do
-  gem 'bundler'
-  gem 'rake'
-  gem 'rubocop', '0.47.0'
+  gem "bundler"
+  gem "rake"
+  gem "rubocop", "0.47.0"
+  gem "hashie", :require => false
 end
 
 group :development do
-  gem 'guard'
-  gem 'guard-rspec'
-  gem 'guard-rubocop'
-  gem 'yard'
-  gem 'appraisal'
-  gem 'benchmark-ips'
-  gem 'redcarpet'
+  gem "guard"
+  gem "guard-rspec"
+  gem "guard-rubocop"
+  gem "yard"
+  gem "appraisal"
+  gem "benchmark-ips"
+  gem "redcarpet"
 end
 
 group :test do
-  gem 'grape-entity', '~> 0.6'
-  gem 'maruku'
-  gem 'rack-test'
-  gem 'rspec', '~> 3.0'
-  gem 'cookiejar'
-  gem 'rack-jsonp', require: 'rack/jsonp'
-  gem 'mime-types'
-  gem 'ruby-grape-danger', '~> 0.1.0', require: false
-  gem 'coveralls', '~> 0.8.17', require: false
+  gem "grape-entity", "~> 0.6"
+  gem "maruku"
+  gem "rack-test"
+  gem "rspec", "~> 3.0"
+  gem "cookiejar"
+  gem "rack-jsonp", :require => "rack/jsonp"
+  gem "mime-types"
+  gem "ruby-grape-danger", "~> 0.1.0", :require => false
+  gem "coveralls", "~> 0.8.17", :require => false
 end
 
-gemspec path: '../'
+gemspec :path => "../"
diff --git a/gemfiles/rails_5.gemfile b/gemfiles/rails_5.gemfile
index 66a30197a6..e29b578d4d 100644
--- a/gemfiles/rails_5.gemfile
+++ b/gemfiles/rails_5.gemfile
@@ -1,35 +1,36 @@
 # This file was generated by Appraisal
 
-source 'https://rubygems.org'
+source "https://rubygems.org"
 
-gem 'rails', '5.0.0'
+gem "rails", "5.0.0"
 
 group :development, :test do
-  gem 'bundler'
-  gem 'rake'
-  gem 'rubocop', '0.47.0'
+  gem "bundler"
+  gem "rake"
+  gem "rubocop", "0.47.0"
+  gem "hashie", :require => false
 end
 
 group :development do
-  gem 'guard'
-  gem 'guard-rspec'
-  gem 'guard-rubocop'
-  gem 'yard'
-  gem 'appraisal'
-  gem 'benchmark-ips'
-  gem 'redcarpet'
+  gem "guard"
+  gem "guard-rspec"
+  gem "guard-rubocop"
+  gem "yard"
+  gem "appraisal"
+  gem "benchmark-ips"
+  gem "redcarpet"
 end
 
 group :test do
-  gem 'grape-entity', '~> 0.6'
-  gem 'maruku'
-  gem 'rack-test'
-  gem 'rspec', '~> 3.0'
-  gem 'cookiejar'
-  gem 'rack-jsonp', require: 'rack/jsonp'
-  gem 'mime-types'
-  gem 'ruby-grape-danger', '~> 0.1.0', require: false
-  gem 'coveralls', '~> 0.8.17', require: false
+  gem "grape-entity", "~> 0.6"
+  gem "maruku"
+  gem "rack-test"
+  gem "rspec", "~> 3.0"
+  gem "cookiejar"
+  gem "rack-jsonp", :require => "rack/jsonp"
+  gem "mime-types"
+  gem "ruby-grape-danger", "~> 0.1.0", :require => false
+  gem "coveralls", "~> 0.8.17", :require => false
 end
 
-gemspec path: '../'
+gemspec :path => "../"
diff --git a/gemfiles/rails_edge.gemfile b/gemfiles/rails_edge.gemfile
index 08dd3d6469..67eac653b6 100644
--- a/gemfiles/rails_edge.gemfile
+++ b/gemfiles/rails_edge.gemfile
@@ -1,35 +1,36 @@
 # This file was generated by Appraisal
 
-source 'https://rubygems.org'
+source "https://rubygems.org"
 
-gem 'arel', github: 'rails/arel'
+gem "arel", :github => "rails/arel"
 
 group :development, :test do
-  gem 'bundler'
-  gem 'rake'
-  gem 'rubocop', '0.47.0'
+  gem "bundler"
+  gem "rake"
+  gem "rubocop", "0.47.0"
+  gem "hashie", :require => false
 end
 
 group :development do
-  gem 'guard'
-  gem 'guard-rspec'
-  gem 'guard-rubocop'
-  gem 'yard'
-  gem 'appraisal'
-  gem 'benchmark-ips'
-  gem 'redcarpet'
+  gem "guard"
+  gem "guard-rspec"
+  gem "guard-rubocop"
+  gem "yard"
+  gem "appraisal"
+  gem "benchmark-ips"
+  gem "redcarpet"
 end
 
 group :test do
-  gem 'grape-entity', '~> 0.6'
-  gem 'maruku'
-  gem 'rack-test'
-  gem 'rspec', '~> 3.0'
-  gem 'cookiejar'
-  gem 'rack-jsonp', require: 'rack/jsonp'
-  gem 'mime-types'
-  gem 'ruby-grape-danger', '~> 0.1.0', require: false
-  gem 'coveralls', '~> 0.8.17', require: false
+  gem "grape-entity", "~> 0.6"
+  gem "maruku"
+  gem "rack-test"
+  gem "rspec", "~> 3.0"
+  gem "cookiejar"
+  gem "rack-jsonp", :require => "rack/jsonp"
+  gem "mime-types"
+  gem "ruby-grape-danger", "~> 0.1.0", :require => false
+  gem "coveralls", "~> 0.8.17", :require => false
 end
 
-gemspec path: '../'
+gemspec :path => "../"