watchOS 5.3.10 (build 16U711) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2026-03-24T18:36:36Z. The update package is 66.67 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: ce71636a8847ad99d0167514efde9817f27937ec.zip.