Enzo Fabbiani upgraded the Ruby version for the rootstrap/rails_api_base repository, moving from 3.3.5 to 3.4.1 to modernize the runtime environment and address security concerns. He updated the .ruby-version file, Dockerfile, and Gemfile, ensuring compatibility with the latest Ruby features and patches. Using Docker and Ruby on Rails, Enzo validated the upgrade through continuous integration and comprehensive testing, confirming that the repository remained stable and ready for future enhancements. This work did not involve bug fixes but focused on version management, laying a solid foundation for upcoming development and reducing technical debt within the project’s codebase.