Release Date: June 23, 2025
Build Number: 25A5295e
Apple Silicon System Firmware Version: 13822.0.166.0.1
T2 BridgeOS System Firmware Version: Pending
New Features & Changes: If you discover additional features, please use the “Edit” button at the end of this post to add your findings. **Resolved Issues**
Details about resolved issues will be added as they become available. **New Issues**
Please report any new issues you encounter by hitting the “Edit” button at the bottom of this post. **Remaining Issues**
We are keeping track of remaining issues, which will be updated as necessary.
**Untested Issues**
One known issue is that alarms may not sound when your display has been asleep for an extended period (FB10086690). A temporary workaround is to adjust your display settings in Settings > Lock Screen to prevent the display from falling asleep, although you can still lower the brightness. **Additional Notes**
This is a DEVELOPER BETA, intended for installation on a secondary device or volume. It is not suitable for everyday use, as some applications may not function correctly.
Memory management can be problematic across all operating systems, not just Apple’s. If you suspect a memory leak, please restart your device via the Apple Menu. When a new macOS release occurs, all issues automatically shift to “Untested Issues” until reviewed. Any issue remaining in an untested state for three releases will be removed from future threads.
macOS 26 Tahoe installation will occur through a Delta Update in System Settings. It does not support installation via a traditional installer. Supported devices for macOS 26 include:
– MacBook Air: M1, M2, M3, M4
– MacBook Pro: 2019 (16-inch only), Intel 2020 (4 Thunderbolt ports only), M1, M1 Pro/M1 Max, M2, M2 Pro/M2 Max, M3/M3 Pro/M3 Max, M4/M4 Pro/M4 Max
– Mac mini: M1, M2/M2 Pro, M4/M4 Pro
– iMac: 5K 2020, M1, M3, M4
– Mac Pro: 2019, M2 Ultra
– Mac Studio: M1 Max/Ultra, M2 Max/Ultra, M3 Ultra, M4 Max
Please watch for updates and provide feedback on issues as they arise.
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