watchOS 5.3.10 (build 16U711) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2026-03-24T18:36:35Z. The update package is 66.89 MB. This is a delta (partial) update that requires 5.3.7 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: ac016d9c12a4728b1e7c4afa20f103cdcd450866.zip.