watchOS 6.3.1

watchOS

Version

6.3.1

Build ID

17U224

File Size

155.3 MB

Release Date

2026-02-02T18:44:48Z

Update Type

Normal release

Delta update - requires 6.3 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 2026-02-02T18:44:48Z. The update package is 155.3 MB. This is a delta (partial) update that requires 6.3 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 8fca70b7b95d7b5a37bd903d125ffbd0a6b6a725.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-01285/4695CDE7-D63C-4CEF-B999-BCFFDAF3CFDC/com_apple_MobileAsset_SoftwareUpdate/8fca70b7b95d7b5a37bd903d125ffbd0a6b6a725.zip