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As of March 7, 2012:
brew update - downloads upgraded formulas
brew upgrade [FORMULA...] - upgrades the specified formulas
brew outdated - lists outdated installations
Note updating all packages may take an excruciatingly long time. You might consider a discriminating approach: run `brew outdated` and select specific packages needing an upgrade.
For more information see homebrew's git repository: https://github.com/mxcl/homebrew
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