watchOS 3.1.3 (build 14S958) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2016-12-21T18:29:52Z. The update package is 144.69 MB. This is a delta (partial) update that requires 3.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 1106984ec97be4146a7f8b8a792d3ba651f05578.zip.