appraise 'rails40' do gem 'rails', '~> 4.0.13' gem 'sprockets', '~> 2' end appraise 'rails41' do gem 'rails', '~> 4.1.12' gem 'sprockets', '~> 2' end appraise 'rails42' do gem 'rails', '~> 4.2.3' gem 'sprockets', '~> 2' end