appraise "rails-20" do gem "rails", "~> 2.0.5" end appraise "rails-31" do gem "rails", "~> 3.1.12" end appraise "rails-32" do gem "rails", "~> 3.2.21" end appraise "rails-40" do gem "rails", "~> 4.0.13" end appraise "rails-41" do gem "rails", "~> 4.1.10" end appraise "rails-42" do gem "rails", "~> 4.2.1" end