appraise "activerecord-4.2" do gem "activerecord", "~> 4.2.0" gem "mysql2", "< 0.5" end appraise "activerecord-5.0" do gem "activerecord", "~> 5.0.0" end appraise "activerecord-5.1" do gem "activerecord", "~> 5.1.0" end appraise "activerecord-5.2" do gem "activerecord", "~> 5.2.0" end appraise "activerecord-6.0" do gem "activerecord", "~> 6.0.2" end appraise "activerecord-master" do gem "activerecord", git: "https://github.com/rails/rails.git" end