appraise 'rails-4-0' do
  gem 'rails', '4.0.13'
end

appraise 'rails-4-1' do
  gem 'rails', '4.1.15'
end

appraise 'rails-4-2' do
  gem 'rails', '4.2.6'
end

appraise 'rails-5-0' do
  gem 'rails', '5.0.0.rc1'
end