watchOS® 4.3.1 is available from Apple. Learn about all the updates to watchOS 4.3.1 on Apple's website, including the impacts to your Apple Watch.
You can update over Wi-Fi, using the Watch app on your iPhone.
Before starting your watchOS update, please make sure:
- Your battery is fully charged
- You have a strong Wi-Fi signal
Learn how to use your device
Apple, Apple Watch, watchOS and Apple Pay are registered trademarks of Apple Inc.