appraise "rails-4.0" do
  gem 'rails', '~> 4.0.0'
end

appraise "rails-4.1" do
  gem 'rails', '~> 4.1.0'
end

appraise "rails-4.2" do
  gem 'rails', '~> 4.2.0'
end

appraise "rails-head" do
  gem 'rails', github: 'rails'
  gem 'arel', github: 'rails/arel'
  gem 'rack', github: 'rack'
end