appraise "4.0" do gem "rails", "~> 4.0.12" end appraise "4.1" do gem "rails", "~> 4.1.8" end appraise "4.2" do gem "rails", "~> 4.2.0" end appraise "5.2" do gem "rails", "~> 5.2.0" end appraise "6.0" do gem "rails", "~> 6.0.2" end