watchOS 5.3.9 (build 16U693) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2020-11-05T18:19:48Z. The update package is 56.86 MB. This is a delta (partial) update that requires 5.3.1 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: db2b83838bd51b9affcab55b3ddf3c81c041528b.zip.