Apple has released the fourth beta of watchOS 10.5 to developers. Similar to previous updates, Apple didn’t mention the changes in the release notes. However, the gradual upgrade bags several improvements and fix the known issues.
Apple Watch receives the new software upgrade with the 21T5571a software version. The size of the fourth beta is around 442MB in download, which is relatively bigger than previous beta updates.

In addition to watchOS 10.5 fourth beta, Apple released the iOS 17.5 beta, iPadOS 17.5, tvOS 17.5, macOS Sonoma 14.5, and visionOS 1.2.
Talking about the features and changes, we are not aware of any new changes available on the watchOS 10.5 beta, nothing new was found in the previously released three beta updates. However, you can expect system-wide enhancements as well as bug fixes.
watchOS 10.5 fourth beta
If your iPhone or iPad is running on the latest version of iOS 17.5 Beta, then you can easily sideload the watchOS 10.5 beta on your Watch.
- Open the Watch app on your iPhone.
- Tap General > Software Update.
- Select Beta Updates and enable watchOS 10 Developer Beta or Public Beta option.
- Go back and download the fourth beta of watchOS 10.5.
- That’s it.
Make sure that your Apple Watch is charged at least 50% and connected to WiFi. After installing the beta profile, open the Apple Watch app on your phone, head over to General > Software Update > Download and Install, then install the new software.
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