appraise "rails3.2" do gem('actionpack', '~> 3.2.0') gem('activesupport', '~> 3.2.0') gem('railties', '~> 3.2.0') end appraise "rails4.0" do gem('actionpack', '~> 4.0.0') gem('activesupport', '~> 4.0.0') gem('railties', '~> 4.0.0') end appraise "rails4.1" do gem('actionpack', '~> 4.1.0.rc1') gem('activesupport', '~> 4.1.0.rc1') gem('railties', '~> 4.1.0.rc1') end