watchOS 6.3.1

watchOS

Version

6.3.1

Build ID

17U224

File Size

298.22 MB

Release Date

2026-02-02T18:44:47Z

Update Type

Normal release

Delta update - requires 6.2 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 5 (44mm) →

About This Update

watchOS 6.3.1 (build 17U224) is an official Apple over-the-air update for the Apple Watch Series 5 (44mm), released on 2026-02-02T18:44:47Z. The update package is 298.22 MB. This is a delta (partial) update that requires 6.2 to already be installed on the device - it cannot be applied from scratch. This update is currently signed by Apple, so it can be applied directly from Settings › General › Software Update.

The OTA payload file is 0a985fd886b75e62e8191ee06e6817eeea1fcad0.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-32209/9E7CAF7C-3CA1-4F1D-920D-B9F034A473DE/com_apple_MobileAsset_SoftwareUpdate/0a985fd886b75e62e8191ee06e6817eeea1fcad0.zip