watchOS 5.3.10 (build 16U711) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm), released on 2026-03-24T18:36:06Z. The update package is 1.29 GB. This is a full OTA update that can be applied from any compatible base version. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: 2f702ed173b1f78e9c46f768a702d7199bce1346.zip.