homebrew - brew (cask) update doesn't work

Question

Could somebody help me here. I try to update flux (from 36.5 to 36.6).

$ brew update
Already up-to-date.

$ brew cask list
....
flux
...

$ brew cask info flux
flux: 36-6
f.lux
https://justgetflux.com/
Not installed
https://github.com/caskroom/homebrew-cask/blob/master/Casks/flux.rb
==> Contents
  Flux.app (app)

$ brew cask update flux
Updated 1 tap (caskroom/cask).
No changes to formulae.

I got the same behavior with other packages. What's wrong? I also run brew doctor and brew cleanup.

Thanks Lukas

Answer 1

Unlike Homebrew, Homebrew Cask can’t upgrade packages. brew cask update is just an alias for brew update which updates Homebrew (Cask) itself.

The only way to “upgrade” an Homebrew cask is either to use its built-in update mecanism (see e.g. Chrome) or to remove it and install it again.