brew-update

Fetch the latest Homebrew and package definitions

TLDR

Update Homebrew and package definitions

$ brew update

Update with verbose output

$ brew update --verbose

Update only if needed (for scripts)

$ brew update --auto-update

Force update from latest commit

$ brew update --force

Reset Homebrew and taps to origin

$ brew update-reset

brew update fetches the newest version of Homebrew and all formulae from GitHub using git, and performs any necessary migrations.This command does not upgrade installed packages - use brew upgrade for that.Aliases: brew up

PARAMETERS

--verbose, -v

Show detailed update information

--debug, -d

Show debugging information

--force

Always do a slower full update

--auto-update

Run only when needed (fast no-op otherwise)

--merge

Use git merge instead of git rebase

AUTO-UPDATE

Homebrew auto-updates before brew install by default. Configure with:HOMEBREW_AUTO_UPDATE_SECS

Seconds between auto-updates

HOMEBREW_NO_AUTO_UPDATE=1

Disable auto-update entirely

WORKFLOW

$ brew update      # Fetch latest definitions
brew outdated    # See what can be upgraded
brew upgrade     # Install newer versions
brew cleanup     # Remove old versions

CAVEATS

Only updates definitions, not installed software. For installed packages, run brew upgrade after updating. Auto-update may slow down install commands; disable with environment variable if needed.