"brew update

Error: /usr/local is not writable. You should change the ownership and permissions of /usr/local back to your user account: sudo chown -R $(whoami) /usr/local

.

.

.

==> Migrating HOMEBREW_REPOSITORY (please wait)...

==> Migrated HOMEBREW_REPOSITORY to /usr/local/Homebrew!

Homebrew no longer needs to have ownership of /usr/local. If you wish you can return /usr/local to its default ownership with: sudo chown root:wheel /usr/local"

You got to love the user experience of this! Thanks Homebrew team. <3