Ruby stuck on 2.6 version

[HenryAugustiano]

Hi! I'm new to Ruby, I am trying to update the ruby version but somehow it keeps using the old version instead of the newly installed version. I can't find any woking solutions online

username@HenMacbook-Pro ~ % brew upgrade ruby

Warning: ruby 3.3.1 already installed
username@HenMacbook-Pro ~ % ruby -v

ruby 2.6.10p210 (2022-04-12 revision 67958) [universal.x86_64-darwin23]

[HenryAugustiano]

also tried using rbenv install 3.3.1

output:
==> Installed ruby-3.3.1 to /Users/username/.rbenv/versions/3.3.1

NOTE: to activate this Ruby version as the new default, run: rbenv global 3.3.1
username@HenMacbook-Pro ~ % rbenv global 3.3.1
username@HenMacbook-Pro ~ % ruby -v
ruby 2.6.10p210 (2022-04-12 revision 67958) [universal.x86_64-darwin23]

[mislav]

Hi! You're doing almost everything right, and you're likely just one small step away from succeeding. Let's set you on the right track.

First of all, there is a system version of Ruby at /usr/bin/ruby that is at version 2.6.10. Because there is already a system version of Ruby, doing brew install ruby or brew upgrade ruby does install a newer Ruby version but does not place it in your PATH (Homebrew calls this "keg-only" formula). That means that just typing ruby -v in your shell will still output 2.6.10, because the PATH still contains only /usr/bin/ruby. You can find what Homebrew installed for you by doing echo `brew --prefix ruby`/bin. For more information on this, you can view the output of brew info ruby.

Now, if you want to use a newer version of Ruby with rbenv, you're on the right track to, but I suspect a similar PATH problem. I see you installed Ruby 3.3.1 and set it as rbenv "global" version. This is all good. But ruby -v still prints 2.6.10, which tells me that rbenv isn't properly set up in your PATH, which is likely due to the eval "$(rbenv init - zsh)" line not being in your ~/.zshrc. Make sure that that line is there and restart your terminal. Then, which ruby should show ~/.rbenv/shims/ruby instead of /usr/bin/ruby, and your rbenv global Ruby version should start to take effect.