watchOS 6.3 (build 17U216) is an official Apple over-the-air update for the Apple Watch Series 5 (44mm), released on 2021-01-26T18:27:20Z. The update package is 558.3 MB. This is a delta (partial) update that requires 6.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 64998eada2b8ebee54a2799e399001170c8ef05b.zip.