watchOS 3.1.3 (build 14S6958) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2016-12-21T18:29:37Z. The update package is 30.97 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: ffe1318b61ee71b337551959fe6549e6fc33bb27.zip.