Gemfile in ransack-1.8.1 vs Gemfile in ransack-1.8.2

@@ -4,12 +4,10 @@
 gem 'rake'
 
 rails = ENV['RAILS'] || '5-0-stable'
 
 if rails == 'master'
-  gem 'rack', github: 'rack/rack'
-  gem 'arel', github: 'rails/arel'
   gem 'polyamorous', github: 'activerecord-hackery/polyamorous'
 else
   gem 'polyamorous', '~> 1.3'
 end
 
@@ -48,9 +46,9 @@
 
 if ENV['DB'] =~ /mongoid5/
   gem 'mongoid', '~> 5.0.0', require: false
 end
 
-# Removed from Ruby 2.2 but needed for testing Rails 3.x.
 group :test do
+  # TestUnit was removed from Ruby 2.2 but still needed for testing Rails 3.x.
   gem 'test-unit', '~> 3.0' if RUBY_VERSION >= '2.2'
 end