watchOS 5.3.10 (build 16U711) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2026-03-24T18:35:45Z. The update package is 1.28 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: 4a19e38054e0d85fa1a49cf5fd9d368dcf6a1d17.zip.