watchOS 3.1.3 (build 14S6959) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2017-01-09T17:56:16Z. The update package is 50.6 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: afaf212ebd357e629bbc9b866b84968970b23e48.zip.