# Pastebin GNaR16vH
$ rbenv install 3.2.6 &6 rbenv global 3.2.6 6& rbenv rehash 66 ruby -v 
ruby build: definition not found: 3.2.6

See all available versions with 'rbenv install -list'.

If the version you need is missing, try upgrading ruby-build:
    brew upgrade ruby build