watchOS 3.1.3 (build 14S960) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2017-01-23T18:02:17Z. The update package is 605.57 MB. This is a delta (partial) update that requires 2.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: a4d497048321aa1cd34d8fcf91a6101bccd90103.zip.