appraise 'sprockets-2.0' do gem 'sprockets', '~> 2.0.0' end appraise 'sprockets-2.1' do gem 'sprockets', '~> 2.1.0' end appraise 'sprockets-2.2' do gem 'sprockets', '~> 2.2.0' end appraise 'sprockets-2.3' do gem 'sprockets', '~> 2.3.0' end appraise 'sprockets-2.4' do gem 'sprockets', '~> 2.4.0' end