Release Date: June 9, 2026
Build Number: 25A5279m
Apple Silicon System Firmware Version: 13822.0.88.511.1
T2 BridgeOS System Firmware Version: 23.16.5283.0.7
New Features & Changes: If you discover any new features, please use the “Edit” option below to share them. Issues Summary:
– Resolved Issues
– New Issues: If you encounter problems, please click “Edit” to report them. – Remaining Issues
– Untested Issues
Among the known issues, alarms may fail to play if the display has been asleep for an extended time (FB10086690).
A possible workaround is to prevent your display from falling asleep in Settings > Lock Screen > Turn display off on ____ when inactive. You can still adjust the brightness as needed. This issue has been persistent since macOS 13.0.
Please note that this is a DEVELOPER BETA. It is recommended to install it on a secondary device or volume, as it may not be suitable for daily use, and some apps may not function correctly. Memory management has been a common challenge across all operating systems.
If you suspect a memory leak, attempt a restart via the Apple Menu. When a new macOS release becomes available, all previously listed issues transition to “Untested Issues” until reviewed. Issues that remain unconfirmed for three releases (either beta or stable) may be removed from future discussions.
macOS 26 Tahoe will be installed through a Delta Update in System Settings, rather than via a direct installer. Supported devices include the MacBook Air (M1, M2, M3, M4), MacBook Pro (various models), Mac mini (M1, M2/M2 Pro, M4/M4 Pro), iMac (5K 2020, M1, M3, M4), Mac Pro (2019, M2 Ultra), and Mac Studio (M1 Max/Ultra, M2 Max/Ultra, M3 Ultra, M4 Max). If your device isn’t listed, it is not supported for this update.
You are welcome to report any new features or issues by clicking the “Edit” button below.
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