rvm list known
rvm install ruby@latest
ruby -v
## If it still shows you ruby 2.0., run rvm use ruby-X.X.X --default.
# Easiest way: download the installer from
https://rubyinstaller.org/
# credit to Stack Overflow user in the source link
choco upgrade ruby
sudo rvm get head
sudo rvm install ruby-2.7.4-railsexpress
rvm use --default ruby-2.7.4-railsexpress