Hi Here are instructions, how to be able run edge Refinery CMS with Rails 6.1.4 and Ruby 2.7.3 / Ruby 3.0.2 Refinery CMS with Ruby 2.7.3 and Rails 6.1.4 If you use rvmrc, like me, create gemset for Ruby 2.7.3 $ vim .rvmrc rvm use ruby-2.7.3@refinerycms-sample4 --create