watchOS 3.1.3 (build 14S959) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2017-01-09T17:56:30Z. The update package is 17.56 MB. This is a delta (partial) update that requires 3.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 8f9a9dd338c210c762aaff0aa008a21e7062ebb6.zip.