watchOS 3.1.3 (build 14S6959) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2017-01-09T17:56:11Z. The update package is 47.99 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: a3a22c582d4ee62e04ec99f1d5e95780074adb4f.zip.