watchOS 5.3.10 (build 16U711) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2026-03-24T18:35:16Z. The update package is 1.35 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: d572ae49e3fb3f7757146870abd2abada0190c56.zip.