watchOS 5.3.10 (build 16U711) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2026-03-24T18:36:34Z. The update package is 68.7 MB. This is a delta (partial) update that requires 5.3.6 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: 81b1f90b4ac2cab3e4f6245d8ed999104a484a51.zip.