In order to update brew (homebrew) on your Mac, simply run the command brew update on the macOS Terminal.
Syntax:brew update [options]
Options:
Fetch the newest version of Homebrew and all formulae from GitHub using git.
--merge
--auto-update
-q, --quiet
-v, --verbose
-d, --debug
Example:
% brew update
Updated 1 tap (homebrew/core).
If there is nothing to update, you will get Already up-to-date.
% brew update
Already up-to-date.

Try brew help update to know more!
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