Apple has released macOS Tahoe 26.6 beta 2 to developers, continuing its refinement of the macOS 26 cycle with a focus on stability, deprecations, and backend fixes ahead of macOS 27 Golden Gate.
The update does not introduce major user-facing features. Instead, Apple is using this beta to tighten system behavior, address lingering issues in system frameworks, and provide clearer guidance for developers as the platform moves toward future releases.
One of the most important changes in macOS Tahoe 26.6 beta 2 is a deprecation notice tied to CoreStorage. Apple confirms that encrypted HFS+ (CoreStorage) is deprecated and will no longer be supported in macOS 28. Developers and users relying on encrypted HFS+ backups on external drives are being advised to transition to encrypted APFS-formatted storage. This marks another step in Apple’s long-running shift away from legacy HFS+ infrastructure.
The update also includes a fix within the Ecosystem framework. Apple resolved an issue where macOS deprecation notifications incorrectly flagged a host app as Intel-only when system plugins, such as Color Picker or Print Dialog extensions, loaded x86 code into the host process. This fix improves accuracy in system-level compatibility reporting, particularly for mixed-architecture workflows.
HealthKit also receives a targeted fix in this release. Apple addressed a bug where temporally weighted average statistics queries for discrete health metrics, such as Resting Heart Rate, could return inaccurately high values when samples overlapped in time.
While macOS Tahoe 26.6 beta 2 is relatively small in scope, it continues Apple’s broader pattern of incremental updates focused on stability and long-term platform transitions rather than new feature introductions. The inclusion of deprecation warnings around CoreStorage also signals Apple’s continued push toward APFS as the default and only recommended file system for modern macOS workflows.
Developers can access the macOS 26.6 SDK through Xcode 26.6, which is available via the Mac App Store. Apple advises testing apps against the latest beta to ensure compatibility with upcoming macOS changes.
