Here are the release notes:
watchOS 8.1 includes the following improvements and bug fixes for your Apple Watch:
– Enhanced algorithms to detect falls during workouts and option to enable fall detection during workouts only (Apple Watch Series 4 and later)
– COVID-19 vaccination card support allows you to present verifiable vaccination information from Apple Wallet
– Fitness+ supports SharePlay to allow subscribers to invite up to 32 people to workout together through a FaceTime call using iPhone, iPad, or Apple TV
– Always On may not display the time accurately for some users when their wrist is down (Apple Watch Series 5 and later)
The update can be downloaded now through the companion Watch app on your iPhone by heading to General > Software Update in the My Watch portion of the app. You can also go to Settings > General > Software Update on an Apple Watch
Your watch needs to have more than 50 percent power and connected to a charger. Like most Apple Watch updates, it could take anywhere from 30 minutes to an hour to complete, so be patient.
It’s compatible with the Apple Watch Series 3 and later.
