MacOS brew upgrade failure - undefined method uses_from_macos for Formulary

Today when I upgrade my outdated packages with Homebrew and encounter this nasty error.

Symptom

Error: glib: undefined method 'uses_from_macos' for Formulary::FormulaNamespace1b33d7b036781a8c4dc38a980a07e0d5::Glib:Class

Causes

Run brew --version, the console shows my Home4rew version is 2.1.4 which is out of dated.

Fixes

Run the command below to update Homebrew to latest version 2.1.6, then run upgrade again. cd "$(brew --repo)" && git fetch && git reset --hard origin/master && brew update

Happy Coding! 😇