I tried updating my Ruby to the current version 2.6.3 in the terminal. When the installation is complete and I check my version it says it's still 2.3.3.
I've tried re-installing 2 times already, both times have not succeded.
Installed ruby-2.6.3 to /Users/user/.rbenv/versions/2.6.3
$ ruby -v
ruby 2.3.3p222 (2016-11-21 revision 56859) [universal.x86_64-darwin17]