Install rbenv and ruby-build

brew install rbenv

Set up rbenv integration with your shell

rbenv init

rbenv-doctor to verify the installation

curl -fsSL https://github.com/rbenv/rbenv-installer/raw/main/bin/rbenv-doctor | bash

List available ruby versionsr

rbenv install -l

Install particular ruby version

rbenv install 3.0.0

List installed ruby versions

rbenv versions

Set a ruby version as the global ruby to use

rbenv global 3.0.0

Check current ruby version in use

ruby -v

Set a directory/application/tool specific ruby version

cd directory-of-app-or-tool
rbenv local 3.0.0

Unset a directory/application/tool specific ruby version

cd directory-of-app-or-tool
rbenv local --unset