Ruby Version Manager

Change the version that you want to use:

If you want to use 2.6.3

Install:

rvm install "ruby-2.6.3"

Use:

rvm use 2.6.3

To make a ruby version default:

rvm use --default 2.6.3

Check which ruby is being used:

rvm which ruby

Uninstall RVM:

rvm implode

I decided to move to RBENV.