Gemfile in grape-entity-0.5.1 vs Gemfile in grape-entity-0.5.2

@@ -1,16 +1,35 @@
 source 'http://rubygems.org'
 
 gemspec
 
-group :development, :test do
+current_ruby_version = Gem::Version.new(RUBY_VERSION)
+
+if Gem::Requirement.new('>= 2.2.2').satisfied_by? current_ruby_version
+  gem 'activesupport', '~> 5.0'
+  gem 'rack', '~> 2.0', group: [:development, :test]
+else
+  gem 'activesupport', '~> 4.0'
+  gem 'rack', '< 2', group: [:development, :test]
+end
+
+gem 'json', '< 2', group: [:development, :test]
+
+group :development do
   gem 'pry'
   gem 'guard'
   gem 'guard-rspec'
   gem 'guard-bundler'
   gem 'rb-fsevent'
   gem 'growl'
-  gem 'json'
+end
+
+group :development, :test do
+  gem 'rake'
   gem 'rspec'
   gem 'rack-test', '~> 0.6.2', require: 'rack/test'
   gem 'rubocop', '0.31.0'
+end
+
+group :test do
+  gem 'ruby-grape-danger', '~> 0.1.0', require: false
 end