D1 will enforce a 50 MB query result limit on November 4, 2026

Clearer errors. Quick Actions that time out now return a consistent error. Outbound Workers that throw an exception now return an HTTP error to the browser.

Absolute links. /links now returns absolute URLs, and links-only crawls now follow relative links.

Updated root certificates. Browser Run removed distrusted root certificates from its trust store.

Beginning Wednesday, November 4, 2026, D1 will enforce a maximum query result size of 50 MB. Queries that return a result larger than 50 MB will fail and return the following error:

Updated default User-Agent. The default User-Agent for Quick Actions now reports Chrome 152 instead of Chrome 119. If you allowlist or match the Browser Run User-Agent, update your rules. You can still set your own value with the userAgent parameter. Refer to Automatic request