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The macOS runner images set HOMEBREW_NO_AUTO_UPDATE in their bashrc and carry a homebrew-core snapshot from image build time. Today the macos-15 image (20260828) installs protobuf 36.0 while macos-26 (20260707) still installs 35.1, so the two legs of this workflow cannot both be compatible with any single gz tap pin. The pin is refreshed against tap HEAD, which OSRF keeps consistent with current homebrew-core, so update core before installing. Dev machines already do this through brew's auto-update. Assisted-by: Claude:claude-fable-5-1 Signed-off-by: Ramon Roche <mrpollo@gmail.com>