Branch cut V8 15.1 on 2026-06-29

[Michael Achenbach]

Hi,

It is time again. If you have any questions regarding the release, please ping this thread.

This time, we're using a new, simplified branching process.

A feature freeze is no longer required.

V8 continues rolling into Chromium until the branch is cut.

TUESDAY/WEDNESDAY 2026-06-29/30 we create the 15.1 branch for V8 cherry-picks AFTER Chromium has branched M151.

When in doubt, ask machenbach@.

As before,  if you happen to work on an important fix, please make sure that the fix is on 15.1 too! See information on merging & patching for the details.

If everything works well, we’ll no longer send this pre-branch email in the future.