Apple has issued new updates for some of its older Apple Watch operating systems, delivering a certificate fix for FaceTime and iMessage.

On Tuesday, alongside the release of the watchOS 26.4 and iOS 18.7.7 updates, new versions of watchOS 5 and watchOS 8 were made available to end users.

watchOS 8.8.2 increases the build number to 19U526, up from the preceding 19U512. The release is compatible with the Apple Watch Series 3 to the Apple Watch Series 7, and can also be installed on the first-generation Apple Watch SE. The Apple Watch Series 4 and newer are also compatible with watchOS 9, however.

The watchOS 5.3.10 update, meanwhile, bears the build number 16U711, up from 16U693. watchOS 5.3.10 is available for the Apple Watch Series 1 through Apple Watch Series 4.

Tuesday's software releases, like the watchOS 9.6.4 and watchOS 10.6.2 updates released in February 2026, include updated iMessage and FaceTime certificates. They're meant to ensure the two services remain operational on older Apple Watch models even after January 2027.

How to update watchOS via iPhone

  • Ensure your watch is charged to 50% and connected to Wi-Fi
  • On your iPhone, open the Apple Watch app
  • Tap General
  • Tap Software Update
  • Download the update if it is available
  • Follow the on-screen instructions