watchOS 5.1.3 (build 16S5531a) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2018-12-19T21:06:28Z. The update package is 70.9 MB. This is a delta (partial) update that requires 5.1.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 552b578faac2eaff7313c174e55fa37a4cfd1b06.zip.