watchOS 3.1.3 (build 14S960) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2017-01-23T18:02:20Z. The update package is 126.74 MB. This is a delta (partial) update that requires 3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 89705e27a0f713c4fd70be5811e5118e6f4be93c.zip.