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# Fetch latest version of homebrew and formula
$ brew update
# Show formulae with an updated version available
$ brew outdated
# Upgrade all outdated and unpinned brews
$ brew upgrade
# Upgrade only the specified brew
$ brew upgrade <formula>
# Prevent the specified formulae from being upgraded
$ brew pin <formula>
# Allow the specified formulae to be upgraded.
$ brew unpin <formula>
Determined Deer