Apple has just released a patch update to macOS Tahoe to bring it to version 26.5.1. This “addresses an issue for enterprise users where Mac computers with an M5 chip could unexpectedly shut down using certain content filtering network extensions.”

There are no security release notes, as Apple states there are no published CVE entries for this update.

The update for Apple silicon Macs is around 2.14 GB in size.

There are no firmware updates, with mBoot for Apple silicon Macs remaining at 18000.120.36. There are no updates to bundled apps, with Safari remaining at version 26.5 (21624.2.5.11.4). Neither are there any significant changes to the contents of /System/Library.

This patch update appears to fix a single problem affecting M5 Macs being used in an enterprise setting. For users of other models, you needn’t rush to install it.

[Updated 1845 GMT on 1 June 2026.]