Apple has released the fourth round of developer betas for its upcoming software updates. Developers can now test iOS 26.4, iPadOS 26.4, watchOS 26.4, tvOS 26.4, visionOS 26.4, and macOS Tahoe 26.4. These early versions allow developers to explore new features and ensure their apps work smoothly with the latest systems.
The release follows Apple’s typical testing cycle. Earlier beta versions appeared throughout February and early March, gradually refining the software before the final release.
A Consistent Beta Release Timeline
Apple introduced the first developer beta for the 26.4 updates on February 16. Soon after, the company released the second round on February 23. The third beta followed on March 2, with macOS receiving its update a day later.
Now, the fourth developer beta continues the testing process. Each version replaces the previous build with updated code and potential bug fixes. For example, iOS 26.4 build 4 (23E5234a) replaces build 23E5223f from the earlier release.
Apple also updated the builds for several other platforms. These include iPadOS, watchOS, visionOS, tvOS, and macOS Tahoe.
New Features and System Changes
Earlier versions of iOS 26.4 introduced several improvements across Apple services and security features. Developers testing the software noticed updates to Apple Podcasts and Apple Music, along with support for end-to-end encryption for RCS messaging.
The system also gained improvements to Stolen Device Protection, which helps secure personal data if an iPhone is lost or stolen. In addition, Apple Health now includes a new average bedtime metric, giving users deeper insight into their sleep patterns.
Another change appears under the hood. Apple replaced the traditional iBoot bootloader name with “mBoot,” suggesting internal system adjustments.
Developers and Users Urged to Proceed Carefully
Although developer betas offer early access to new features, they often contain bugs or unfinished elements. Apple therefore recommends installing these versions only on secondary devices used for testing.
Developers and testers should also back up their data before installing any beta software. This step helps prevent potential data loss if issues occur during testing.
For everyday users, Apple usually releases a public beta shortly after the developer version. Public beta builds typically include additional fixes and stability improvements.
Preparing for the Final Release
With multiple beta versions already available, Apple appears to be moving steadily toward the final release of the 26.4 updates.
Each new build helps developers refine apps and identify problems before the software reaches millions of devices. As testing continues, Apple will likely introduce more improvements and performance updates.
For now, developers remain the first to explore the newest features shaping Apple’s next generation of operating systems.
