watchOS 6.3.1 (build 17U224) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2026-02-02T18:44:10Z. The update package is 519.3 MB. This is a delta (partial) update that requires 6.2 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: afd94c848189faea6d9466ced50d0718870840ba.zip.