Setup
MacOS does come with Ruby pre-installed. However, the version of Ruby that is included with macOS may vary depending on the specific version of macOS you are using.
It’s recommended to check the version of Ruby installed on your specific macOS version by opening a terminal and running the command ruby -v
Steps to run other versions
Install chruby and ruby-install with Homebrew
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brew install ruby-install chruby
To install specific version of ruby
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ruby-install ruby 2.7.1
ruby-install ruby 3.1.3
Make sure you’re chruby works properly. If it shows a command not found exception. Add following to ~/.bash_profile or ~/.zshrc:
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# Make sure one of the paths exist:
# option 1
source /usr/local/opt/chruby/share/chruby/chruby.sh
source /usr/local/opt/chruby/share/chruby/auto.sh
# option 2
source /opt/homebrew/opt/chruby/share/chruby/chruby.sh
source /opt/homebrew/opt/chruby/share/chruby/auto.sh
*auto.sh above enables auto-switching if Rubies specified by .ruby-version files
Save your file and source it
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source ~/.bash_profile
source ~/.zshrc
To list available Ruby versions:
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chruby
To change ruby version
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# to change it:
chruby 3.1.3
# to check version changed:
ruby -v