watchOS 5.1.3 (build 16S5531a) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2018-12-19T21:06:12Z. The update package is 76.99 MB. This is a delta (partial) update that requires 5.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b99b0742e6b65243899ab2253b2a582eabd4830a.zip.