rbenv not changing version

1. Check available Ruby versions:

rbenv install -l

1. Install the desired Ruby version:

rbenv install <version_number>

1. Set the global Ruby version:

rbenv global <version_number>

1. Reinitialize the shell:

exec $SHELL

1. Verify the Ruby version:

ruby -v

1. If the global version is not set correctly, set it again:

rbenv global <version_number>

1. Check the Ruby version again:

ruby -v

1. If the issue persists, check the Ruby version for the current directory:

rbenv local

1. If a local version is set, unset it:

rbenv local --unset

1. Check the Ruby version again:

ruby -v