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 603.76 MB. This is a delta (partial) update that requires 2.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: e1931ef7acac02af5ebb7170c5a74819f50a9eba.zip.