watchOS 3.1.3 (build 14S6959) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2017-01-09T17:56:15Z. The update package is 59.89 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: d1c2cf877896e05265d1b1dbe65fc27ff67e808d.zip.