Gizmodo has confirmed that watchOS 27 works with Apple Watch Series 9 and later, contrary to an error on Apple's own preview website.

Apple apparently left the Series 9 off a watchOS 27 compatability list. That said, the OS drops support for five older Apple Watches that currently work with watchOS 26.

Apple today confirmed that the Apple Watch Series 9 is compatible with watchOS 27, after the device was mistakenly omitted from the software's official compatibility page. Apple updated its website ...

Apple announced a surprisingly restrictive compatibility list for watch OS 27 at WWDC 2026, dropping support for six previous models, including the Apple Watch Series ...