Google is making a change to Chrome Sync that will affect users who haven't updated their browser in a while. Starting in early 2025, Chrome Sync will stop working on versions of Chrome that are more than four years old.

If you haven’t updated your browser for four years, now’s the time.

If you’re on such an older version of Chrome, you may start seeing error messages that say “Update Chrome to start sync” or “Update Chrome to keep using the Chrome data in your Google Account.” To keep your Chrome profile data synchronized, you’ll need to update Chrome to the newest version (s) available for your device (s).

New rules have been announced for the Chrome Sync service, an element of Chrome that allows passwords and other data to be synchronized between users' devices. Google aims to limit this option to regularly updated Chrome versions,

A new policy for Chrome Sync will see Google disable the functionality if you haven't updated your browser recently enough.