Apple today seeded the general public with watchOS 3.1.3 for the Apple Watch. This update brings additional security patches and bug fixes to the Apple Watch, Watch Series 1, and Watch Series 2. It also comes two weeks after the last beta of the software update was released for testing purposes.
To install watchOS 3.1.3 on your Apple Watch, navigate to the Watch app on your paired iPhone and tap the “My Watch” tab. From there, go to General > Software Update and you should see the update ready for download. Be sure to place your iPhone on Wi-Fi while downloading this software as it’ll surely gobble up plenty of your data.