watchOS 5.1.3 (build 16S5531a) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2018-12-19T21:06:11Z. The update package is 137.26 MB. This is a delta (partial) update that requires 5.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: e3aae8a6d779d488688fd4b8f7646097e09203f4.zip.