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Apple Limits watchOS 27 to S9/S10 Watches, Leaving Recent Models Unable to Upgrade

On-device Siri AI requires S9/S10-class silicon, a requirement that shortens Apple Watch software support and raises questions about future app and iPhone-pairing compatibility.

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Your Apple Watch Ultra isn't suddenly obsolete because it can't install watchOS 27.
Apple Watch displaying watchOS 27 with colorful app icons on the home screen.

Overview

  • The official watchOS 27 compatibility list announced at WWDC on Monday restricts the update to Apple Watch SE 3, Series 9, Series 10, Series 11, Ultra 2 and Ultra 3.
  • Watches excluded from the list will stay on watchOS 26 and continue to perform core tasks like notifications, fitness tracking and health monitoring but will not receive watchOS 27 features.
  • The key missing features for unsupported models include the new Siri conversational AI and other on-device AI improvements that Apple says need S9/S10-class silicon to run.
  • The decision shortens the typical software lifespan for affected watches and has prompted user frustration because some models are only a few years old while older iPhones still get new iOS releases.
  • Analysts warn this cutoff could lead third-party developers to stop targeting older watchOS versions and might eventually limit pairing between newer iOS releases and older watches, reducing practical device longevity.