watchOS 6.3.1 (build 17U6224) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2026-02-02T18:44:12Z. The update package is 275.2 MB. This is a delta (partial) update that requires 6.2.8 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: a3b4791c6a31fcf993399952aff3457da852a0a7.zip.