diff --git a/Gemfile b/Gemfile
index d751fe154..ab614bebf 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,22 @@
+# encoding: utf-8
 source 'https://rubygems.org'
-
 gemspec
 
-gem 'license_finder', :group => :development
+group :test do
+  gem 'bundler', '~> 1.5'
+  gem 'minitest', '~> 5.5'
+  gem 'rake', '~> 10'
+  gem 'rubocop', '~> 0.33.0'
+  gem 'simplecov', '~> 0.10'
+end
+
+group :integration do
+  gem 'test-kitchen', '~> 1.4'
+  gem 'kitchen-vagrant'
+  gem 'concurrent-ruby', '~> 0.9'
+end
+
+group :tools do
+  gem 'pry', '~> 0.10'
+  gem 'license_finder'
+end
diff --git a/vulcano.gemspec b/vulcano.gemspec
index d7a0169e2..26bda0b61 100644
--- a/vulcano.gemspec
+++ b/vulcano.gemspec
@@ -18,15 +18,6 @@ Gem::Specification.new do |spec|
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ['lib']
 
-  spec.add_development_dependency 'bundler', '~> 1.5'
-  spec.add_development_dependency 'minitest', '~> 5.5'
-  spec.add_development_dependency 'rake', '~> 10'
-  spec.add_development_dependency 'pry', '~> 0.10'
-  spec.add_development_dependency 'rubocop', '~> 0.33.0'
-  spec.add_development_dependency 'simplecov', '~> 0.10'
-  spec.add_development_dependency 'concurrent-ruby', '~> 0.9'
-  spec.add_development_dependency 'test-kitchen', '~> 1.4'
-
   spec.add_dependency 'thor', '~> 0.19'
   spec.add_dependency 'json', '~> 1.8'
   spec.add_dependency 'rainbow', '~> 2'