Brewfile is out-of-date?

[shoshber (Shoshana Berleant)]

$ brew bundle

Error: homebrew/dupes was deprecated. This tap is now empty as all its formulae were migrated.

Tapping homebrew/dupes has failed!

[j.jaffeux (Joffrey Jaffeux)]

Fixed by:

https://github.com/discourse/discourse/commit/c689731fab8281093ee4562278f6740b6db94031