diff --git a/Gemfile b/Gemfile
index 46d072547b7..65aa5128729 100644
--- a/Gemfile
+++ b/Gemfile
@@ -28,18 +28,18 @@
 
 source 'https://rubygems.org'
 
-gem "rails", "4.0.13"
+gem 'rails', '4.0.13'
 gem 'protected_attributes'
 gem 'actionpack-action_caching'
 gem 'activerecord-session_store'
 gem 'rails-observers'
 
-gem "coderay", "~> 1.0.9"
-gem "rubytree", "~> 0.8.3"
-gem "rdoc", ">= 2.4.2"
+gem 'coderay', '~> 1.0.9'
+gem 'rubytree', '~> 0.8.3'
+gem 'rdoc', '>= 2.4.2'
 gem 'globalize', '~> 4.0.3'
 gem 'omniauth'
-gem 'request_store', "~> 1.1.0"
+gem 'request_store', '~> 1.1.0'
 gem 'gravatar_image_tag', '~> 1.2.0'
 
 gem 'warden', '~> 1.2'
@@ -47,14 +47,14 @@ gem 'warden-basic_auth', '~> 0.2.0'
 
 # TODO: adds #auto_link which was deprecated in rails 3.1
 gem 'rails_autolink', '~> 1.1.6'
-gem "will_paginate", '~> 3.0'
-gem "acts_as_list", "~> 0.3.0"
+gem 'will_paginate', '~> 3.0'
+gem 'acts_as_list', '~> 0.3.0'
 
-gem "awesome_nested_set", '~> 2.1.6'
+gem 'awesome_nested_set', '~> 2.1.6'
 
-gem 'color-tools', '~> 1.3.0', :require => 'color'
+gem 'color-tools', '~> 1.3.0', require: 'color'
 
-gem "ruby-progressbar"
+gem 'ruby-progressbar'
 
 # to generate html-diffs (e.g. for wiki comparison)
 gem 'htmldiff'
@@ -63,7 +63,7 @@ gem 'htmldiff'
 # used for statistics on svn repositories
 gem 'svg-graph'
 
-gem "date_validator", '~> 0.7.1'
+gem 'date_validator', '~> 0.7.1'
 gem 'ruby-duration', '~> 3.2.0'
 
 # We rely on this specific version, which is the latest as of now (end of 2013),
@@ -79,14 +79,14 @@ gem 'daemons'
 
 # include custom rack-protection for now until rkh/rack-protection is fixed and released
 # (see https://community.openproject.org/work_packages/3029)
-gem 'rack-protection', :git => "https://github.com/finnlabs/rack-protection.git", :ref => '5a7d1bd'
+gem 'rack-protection', git: 'https://github.com/finnlabs/rack-protection.git', ref: '5a7d1bd'
 
 # Rack::Attack is a rack middleware to protect your web app from bad clients.
 # It allows whitelisting, blacklisting, throttling, and tracking based on arbitrary properties of the request.
 # https://github.com/kickstarter/rack-attack
 gem 'rack-attack'
 
-gem 'syck', :platforms => [:mri, :mingw, :x64_mingw], :require => false
+gem 'syck', platforms: [:mri, :mingw, :x64_mingw], require: false
 
 gem 'gon', '~> 4.0'
 
@@ -109,10 +109,10 @@ gem 'execjs',           '~> 2.4.0'
 gem 'bourbon',          '~> 4.2.0'
 gem 'uglifier',         '>= 1.0.3', require: false
 
-gem "prototype-rails"
+gem 'prototype-rails'
 # remove once we no longer use the deprecated "link_to_remote", "remote_form_for" and alike methods
 # replace those with :remote => true
-gem 'prototype_legacy_helper', '0.0.0', :git => 'https://github.com/rails/prototype_legacy_helper.git'
+gem 'prototype_legacy_helper', '0.0.0', git: 'https://github.com/rails/prototype_legacy_helper.git'
 
 # small wrapper around the command line
 gem 'cocaine'
@@ -130,16 +130,16 @@ gem 'rack', '~> 1.5.4' # CVE-2015-3225
 gem 'nokogiri', '~> 1.6.6'
 
 gem 'carrierwave', '~> 0.10.0'
-gem 'fog', '~> 1.23.0', require: "fog/aws/storage"
+gem 'fog', '~> 1.23.0', require: 'fog/aws/storage'
 
 group :test do
   gem 'rack-test', '~> 0.6.2'
   gem 'shoulda-context', '~> 1.2'
 
   gem 'object-daddy', '~> 1.1.0'
-  gem "launchy", "~> 2.3.0"
-  gem "factory_girl_rails", "~> 4.5"
-  gem 'cucumber-rails', "~> 1.4.2", :require => false
+  gem 'launchy', '~> 2.3.0'
+  gem 'factory_girl_rails', '~> 4.5'
+  gem 'cucumber-rails', '~> 1.4.2', require: false
   gem 'rack_session_access'
   # restrict because in version 1.3 a lot of tests using acts as journalized
   # fail stating: "Column 'user_id' cannot be null". I don't understand the
@@ -150,7 +150,7 @@ group :test do
   # also add to development group, so "spec" rake task gets loaded
   gem 'rspec-rails', '~> 3.3.0', group: :development
   gem 'rspec-activemodel-mocks'
-  gem 'rspec-example_disabler', git: "https://github.com/finnlabs/rspec-example_disabler.git"
+  gem 'rspec-example_disabler', git: 'https://github.com/finnlabs/rspec-example_disabler.git'
   gem 'rspec-legacy_formatters'
   gem 'capybara', '~> 2.3.0'
   gem 'capybara-screenshot', '~> 1.0.4'
@@ -159,19 +159,19 @@ group :test do
   gem 'selenium-webdriver', '~> 2.45.0'
   gem 'timecop', '~> 0.7.1'
 
-  gem 'rb-readline', "~> 0.5.1" # ruby on CI needs this
+  gem 'rb-readline', '~> 0.5.1' # ruby on CI needs this
   # why in Gemfile? see: https://github.com/guard/guard-test
   gem 'ruby-prof'
   gem 'simplecov', '0.8.0.pre'
-  gem "shoulda-matchers", '~> 2.8', require: nil
-  gem "json_spec"
-  gem "activerecord-tableless", "~> 1.0"
+  gem 'shoulda-matchers', '~> 2.8', require: nil
+  gem 'json_spec'
+  gem 'activerecord-tableless', '~> 1.0'
   gem 'codecov', require: nil
   gem 'equivalent-xml', '~> 0.5.1'
 end
 
 group :ldap do
-  gem "net-ldap", '~> 0.8.0'
+  gem 'net-ldap', '~> 0.8.0'
 end
 
 group :development do
@@ -186,7 +186,7 @@ group :development, :test do
   gem 'pry-rails'
   gem 'pry-stack_explorer'
   gem 'pry-rescue'
-  gem 'pry-byebug', :platforms => [:mri]
+  gem 'pry-byebug', platforms: [:mri]
   gem 'pry-doc'
 end
 
@@ -203,28 +203,28 @@ gem 'reform', '~> 1.2.6', require: false
 
 platforms :mri, :mingw, :x64_mingw do
   group :mysql2 do
-    gem "mysql2", "~> 0.3.11"
+    gem 'mysql2', '~> 0.3.11'
   end
 
   group :postgres do
-    gem 'pg', "~> 0.17.1"
+    gem 'pg', '~> 0.17.1'
   end
 end
 
 platforms :jruby do
-  gem "jruby-openssl"
+  gem 'jruby-openssl'
 
   group :mysql do
-    gem "activerecord-jdbcmysql-adapter"
+    gem 'activerecord-jdbcmysql-adapter'
   end
 
   group :postgres do
-    gem "activerecord-jdbcpostgresql-adapter"
+    gem 'activerecord-jdbcpostgresql-adapter'
   end
 end
 
 # Load Gemfile.local, Gemfile.plugins and plugins' Gemfiles
-Dir.glob File.expand_path("../{Gemfile.local,Gemfile.plugins,lib/plugins/*/Gemfile}", __FILE__) do |file|
+Dir.glob File.expand_path('../{Gemfile.local,Gemfile.plugins,lib/plugins/*/Gemfile}', __FILE__) do |file|
   next unless File.readable?(file)
   eval_gemfile(file)
 end