watchOS 5.3.9 (build 16U693) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2020-11-05T18:19:49Z. The update package is 51.83 MB. This is a delta (partial) update that requires 5.3.4 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: 1c7409827369e9dac64b75c34337fadfceec6df4.zip.