not update chah-s/bin/zsh
not run the shell chash -s /bin /zsh
Question marked as
If you DO NOT want to switch to zsh, then you can add the following to your .bash_profile
export BASH_SILENCE_DEPRECATION_WARNING=1
And macOS will stop bugging you to switch.
If you want a newer version of bash, then use Homebrew to get a newer version.
If you do want to switch to zsh, then the command is
/usr/bin/chsh -s /bin/zsh
If I have guessed wrong about what you want, please clarify.