diff --git a/Gemfile b/Gemfile
index 0a7358de..7c374c7c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,47 +1,54 @@
 source 'https://rubygems.org'
 gemspec
 
-gem 'pry'
-gem 'toml', '~> 0.1.0'
-gem 'jekyll-paginate', '~> 1.0'
-gem 'jekyll-gist', '~> 1.0'
-gem 'jekyll-coffeescript', '~> 1.0'
-
-platform :ruby, :mswin, :mingw do
-  gem 'pygments.rb', '~> 0.6.0'
-  gem 'rdiscount', '~> 2.0'
-  gem 'classifier-reborn', '~> 2.0'
-  gem 'redcarpet', '~> 3.2', '>= 3.2.3'
-  gem 'liquid-c', '~> 3.0'
-end
-
-if RUBY_PLATFORM =~ /cygwin/ || RUBY_VERSION.start_with?("2.2")
-  gem 'test-unit'
-end
-
 gem 'rake', '~> 10.1'
-gem 'rdoc', '~> 4.2'
-gem 'redgreen', '~> 1.2'
-gem 'shoulda', '~> 3.5'
-gem 'cucumber', '~> 2.0'
-gem 'launchy', '~> 2.3'
-gem 'simplecov', '~> 0.9'
+group :development do
+  gem 'rdoc', '~> 4.2'
+  gem 'launchy', '~> 2.3'
+  gem 'toml', '~> 0.1.0'
+  gem 'pry'
+end
+
+group :test do
+  gem 'redgreen', '~> 1.2'
+  gem 'shoulda', '~> 3.5'
+  gem 'cucumber', '~> 2.0'
+  gem 'simplecov', '~> 0.9'
+  gem 'jekyll_test_plugin'
+  gem 'jekyll_test_plugin_malicious'
+  gem 'minitest-reporters'
+  gem 'minitest-profile'
+  gem 'minitest'
+  gem 'rspec-mocks'
+
+  if RUBY_PLATFORM =~ /cygwin/ || RUBY_VERSION.start_with?("2.2")
+    gem 'test-unit'
+  end
+
+  if ENV['PROOF']
+    gem 'html-proofer', '~> 2.0'
+  end
+end
+
+group :benchmark do
+  if ENV['BENCHMARK']
+    gem 'ruby-prof'
+    gem 'rbtrace'
+    gem 'stackprof'
+    gem 'benchmark-ips'
+  end
+end
+
+gem 'jekyll-paginate', '~> 1.0'
+gem 'jekyll-coffeescript', '~> 1.0'
+gem 'jekyll-gist', '~> 1.0'
 gem 'mime-types', '~> 2.6'
 gem 'kramdown', '~> 1.8.0'
-gem 'jekyll_test_plugin'
-gem 'jekyll_test_plugin_malicious'
-gem 'minitest-reporters'
-gem 'minitest-profile'
-gem 'minitest'
-gem 'rspec-mocks'
 
-if ENV['BENCHMARK']
-  gem 'ruby-prof'
-  gem 'rbtrace'
-  gem 'stackprof'
-  gem 'benchmark-ips'
-end
-
-if ENV['PROOF']
-  gem 'html-proofer', '~> 2.0'
+platform :ruby, :mswin, :mingw do
+  gem 'rdiscount', '~> 2.0'
+  gem 'pygments.rb', '~> 0.6.0'
+  gem 'redcarpet', '~> 3.2', '>= 3.2.3'
+  gem 'classifier-reborn', '~> 2.0'
+  gem 'liquid-c', '~> 3.0'
 end