watchOS 5.3.10 (build 16U711) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2026-03-24T18:35:42Z. The update package is 72.92 MB. This is a delta (partial) update that requires 5.3.9 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: 71c2121ac3a4b5dd85849c2339c93ff6f910787f.zip.