watchOS 26.5: What’s New, What’s Fixed, and Whether to Update

Messages could use SMS instead of iMessage

watchOS 26.5 fixes an issue where Messages on Apple Watch may use SMS instead of iMessage when the watch is paired with a dual-SIM iPhone . That fix matters most if you use multiple phone lines and have seen Apple Watch messages fall back to SMS unexpectedly.

Workout audio alerts could fail when your iPhone was not nearby

The update also fixes an issue where Workout app audio alerts could fail to play when the paired iPhone was not nearby . That is especially relevant for workouts where users leave the phone behind and rely on the watch for audio cues; MacDailyNews similarly summarized the fix as addressing Workout audio alerts when the paired iPhone was not nearby .

Security content

Apple published a dedicated security-content page for watchOS 26.5 and lists the release date as May 11, 2026 . Apple also notes that, for customer protection, it does not disclose, discuss, or confirm security issues until an investigation has occurred and patches or releases are available; its security documents reference vulnerabilities by CVE-ID when possible .

In other words, the feature list is short, but the security notes are still a reason to treat watchOS 26.5 as a worthwhile maintenance update.

How to install watchOS 26.5

watchOS 26.5 can be installed from an iPhone running iOS 26.5 by opening the Apple Watch app and going to General > Software Update; MacRumors also notes that the update can be initiated from the Settings app on the watch . To install, the Apple Watch needs at least 50% battery and should be placed on its charger .

Should you update?

If you are affected by the dual-SIM Messages bug or missing Workout audio alerts, watchOS 26.5 is a targeted fix. If you are not, it is still a sensible maintenance update because it includes bug fixes, performance improvements, and Apple-published security content . Just do not expect a major new-feature release: based on the provided release coverage, Pride Luminance is the only clearly documented new user-facing addition .