watchOS 5.3.9 (build 16U693) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2020-11-05T18:19:42Z. The update package is 46.22 MB. This is a delta (partial) update that requires 5.3.8 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: 89d57b3ab7ec05a80254f5cc8f14a37b6803e6b5.zip.