appraise "rails-5.1" do gem "rails", "~> 5.1.0" end appraise "rails-5.2" do gem "rails", "~> 5.2.0" end appraise "rails-6.0" do gem "rails", "~> 6.0.0" end appraise "rails-6.1" do gem "rails", "~> 6.1.0" end