appraise "rails_6.0" do gem "railties", "~> 6.0" gem "net-smtp", require: false # not bundled in ruby 3.1 gem "psych", "< 4" # psych 4 switched from unsafe load to safe load end appraise "rails_6.1" do gem "railties", "~> 6.1" gem "net-smtp", require: false # not bundled in ruby 3.1 end appraise "rails_7.0" do gem "railties", "~> 7.0" end