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How to update outdated homebrew packages

First, update your homebrew formulae:

>brew update
Updated Homebrew from 98dc2cdb to 5dff180c.

Second, check what is outdated:

>brew outdated
cmake (  3.0.0)

Finally, update all outdated packages with

brew upgrade

or certain packages with

brew upgrade $FORMULA

Depending on the packages, this step may take a while.

From time to time you might want to delete old packages:

#check what will be removed
brew cleanup -n
#remove all
brew cleanup
#remove certain packages
brew cleanup $FORMULA

More information about homebrew usage can be found in the homebrew wiki.