For those of us who use homebrew today, how do we get the new cool benefits ? Is there a command to upgrade (like ```brew upgrade```) everything to the new hotness, do we need to uninstall everything and reinstall ?

It's probably discussed somewhere but didn't find when glancing at the OP.

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m0do1 3 hours ago | parent [-]

there is `brew update`

	▲	golem14 4 minutes ago \| parent [-]
		sure, but is that doing the same as deleting all installed sw and then reinstalling it using the new safeguards? Assuming I have already installed something homebrew 6 would not let install, will I get a warning?