A Comparison of Ruby Version Managers for macOS - SitePoint

Folks who are new to Ruby are delighted to discover that Ruby comes pre-installed on macOS. They’re often disappointed when a more experienced developer tells them, “Don’t use the Mac system Ruby.” I’ve written elsewhere about the reasons. In short, the system Ruby is there for macOS, not for you. It’s fine for running utility scripts, but for development, the system Ruby is out of date and, if you’re not careful, installation of gems can lead to headaches (including system security violations).