appraise 'rails42' do gem 'rails', '~> 4.2.0' gem 'activeadmin', '1.0.0.pre4' end appraise 'rails50' do gem 'rails', '~> 5.0.0' gem 'inherited_resources', github: 'activeadmin/inherited_resources' gem 'activeadmin', github: 'activeadmin/activeadmin' end