watchOS 5.1.3 (build 16S5531a) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2018-12-19T21:06:27Z. The update package is 150.78 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: 6c4d37336274628303491391d8a26e02c7812509.zip.