appraise "activesupport-3.0" do gem 'activesupport', '~> 3.0.9' end appraise "activesupport-3.1" do gem 'activesupport', '~> 3.1.0' end appraise "activesupport-3.2" do gem 'activesupport', '~> 3.2.0' end