Apple Seeds Fifth Beta of watchOS 4.3.1 to Developers

Apple today seeded the fifth beta of an upcoming watchOS 4.3.1 update to developers for testing purposes, one week after seeding the fourth watchOS 4.3.1 beta and more than a month after releasing watchOS 4.3.

Once the proper configuration profile has been installed from the Apple Developer Center, the new watchOS 4.3.1 beta can be downloaded through the dedicated Apple Watch app on the iPhone by going to General --> Software update.

watchos431beta
To install the update, the Apple Watch needs to have at least 50 percent battery, it must be placed on the charger, and it has to be in range of the iPhone.

Shortly before watchOS 4.3.1 was introduced, Apple stopped allowing developers to update Apple Watch apps built on the original watchOS 1 SDK. In watchOS 4.3.1, there's an alert when launching a watchOS 1 app that warns that the app may not be compatible with future versions of watchOS. This suggests Apple will drop support for watchOS 1 apps entirely in the future, just as it did with support for 32-bit iOS apps in iOS 11.

Code hidden within watchOS 4.3.1 also suggests Apple is working on introducing support for custom third-party watch faces, but this is likely a feature that would be introduced as part of a major watchOS 5 update rather than through watchOS 4.3.1.

There were no major new features discovered in first four watchOS 4.3.1 betas, which is unsurprising as this is a minor 4.x.x update. It's likely this update focuses primarily on bug fixes to address issues discovered since the release of watchOS 4.3.

Apple does not provide detailed release notes for watchOS, so we may not know what's included in the update until it sees a public release.

Related Roundup: Apple Watch 11
Buyer's Guide: Apple Watch (Buy Now)

Popular Stories

iOS 26

iOS 26.4 and iOS 27 Features Revealed in New Leak

Friday December 12, 2025 10:56 am PST by
Macworld's Filipe Espósito today revealed a handful of features that Apple is allegedly planning for iOS 26.4, iOS 27, and even iOS 28. The report said the features are referenced within the code for a leaked internal build of iOS 26 that is not meant to be seen by the public. However, it appears that Espósito and/or his sources managed to gain access to it, providing us with a sneak peek...
Apple Logo Top Half

Early iOS 26 Software Leak Uncovers Dozens of Upcoming Apple Features

Monday December 15, 2025 3:05 pm PST by
Software from an iPhone prototype running an early build of iOS 26 leaked last week, giving us a glimpse at future Apple devices and iOS features. We recapped device codenames in our prior article, and now we have a list of some of the most notable feature flags that were found in the software code. In some cases, it's obvious what the feature flags are referring to, while some are more...
apple beta 26 lineup

Apple Leak Confirms Work on Foldable iPhone, AirTag 2, and Dozens More Devices

Monday December 15, 2025 2:05 pm PST by
Last week, details about unreleased Apple devices and future iOS features were shared by Macworld. This week, we learned where the information came from, plus we have more findings from the leak. As it turns out, an Apple prototype device running an early build of iOS 26 was sold, and the person who bought it shared the software. The OS has a version number of 23A5234w, and the first...
iOS 26

iOS 26.3 Beta 1 Features: What's New So Far

Monday December 15, 2025 4:23 pm PST by
Apple is testing iOS 26.3, the next version of iOS 26 that will launch around January. Since iOS 26.3's testing is happening over the holidays, it is a smaller update with fewer features than we've seen in prior betas. We've rounded up what's new so far, and we'll add to our list with subsequent betas if we come across any other features. Transfer to Android Apple is making it simpler...
Apple Foldable Thumb

Leak Reveals Foldable iPhone Details

Monday December 15, 2025 9:09 am PST by
The first foldable iPhone will feature a series of design and hardware firsts for Apple, according to details shared by the Weibo leaker known as Digital Chat Station. According to a new post, via machine translation, Apple is developing what the leaker describes as a "wide foldable" device, a term used to refer to a horizontally oriented, book-style foldable with a large internal display....
iOS 26

Apple Releases iOS 26.2 With Alarms for Reminders, Lock Screen Changes, Enhanced Safety Alerts and More

Friday December 12, 2025 10:10 am PST by
Apple today released iOS 26.2, the second major update to the iOS 26 operating system that came out in September, iOS 26.2 comes a little over a month after iOS 26.1 launched. ‌iOS 26‌.2 is compatible with the ‌iPhone‌ 11 series and later, as well as the second-generation ‌iPhone‌ SE. The new software can be downloaded on eligible iPhones over-the-air by going to Settings >...
airpods max 2024 colors

AirPods Max 2 Likely to Offer These 10 New Features

Monday December 15, 2025 7:41 am PST by
Apple released the AirPods Max on December 15, 2020, meaning the over-ear headphones launched five years ago today. While the AirPods Max were updated with a USB-C port and new color options last year, followed by support for lossless audio and ultra-low latency audio this year, the headphones lack some of the features that have been introduced for newer generations of the regular AirPods and the ...
iOS 26

iOS 26.2 Coming Soon With These 8 New Features on Your iPhone

Thursday December 11, 2025 8:49 am PST by
Apple seeded the second iOS 26.2 Release Candidate to developers earlier this week, meaning the update will be released to the general public very soon. Apple confirmed iOS 26.2 would be released in December, but it did not provide a specific date. We expect the update to be released by early next week. iOS 26.2 includes a handful of new features and changes on the iPhone, such as a new...

Top Rated Comments

Peel Avatar
99 months ago
With AirPlay 2 live in their other betas, does the WatchOS 4.3.1 allow for adding/removing devices playing a music stream? Seems like it would be a logical addition to the Music Control app.
Score: 1 Votes (Like | Disagree)
pnoyblazed Avatar
99 months ago
build 15T5567a
Score: 1 Votes (Like | Disagree)