Apple macOS Tahoe (26) Update Version macOS Tahoe 26.4

macOS Tahoe 26.4, released on 2026-03-16, adds offline Background Assets status checks, Network MIDI 2.0 support, and new StoreKit transaction fields. It also includes fixes for AppKit, networking, login, virtualization, and other system components.

• Address Sanitizer and Thread Sanitizer might hang on macOS 26.4 when building with Xcode 26.3 or older; use Xcode 26.4 for testing.
• Rosetta notification changes warn users about upcoming incompatibility for Intel-based apps, with allowRosettaUsageAwareness available for managed devices.

• Fixed an AppKit issue where the window resize pointer did not follow the window’s corner shape.
• Fixed a Background Assets issue where setting a URL override could break App Store apps using Apple-Hosted Background Assets.
• Fixed a Background Assets crash that could occur when downloading asset packs.
• Fixed HFS external media that might fail to mount automatically.
• Fixed an installation issue where Install macOS Tahoe Beta.app did not work on macOS versions prior to 15.0.
• Fixed a Touch ID issue where a standard user might not be able to unlock the screen after updating with FileVault enabled.
• Fixed a networking leak where multiple processes could leak CFRunLoopSource objects with PAC or auto proxy discovery.
• Fixed a StoreKit issue where Purchase Intents might not be emitted when the app is launched from the background.
• Fixed a SwiftUI issue where the latest .userActivity was not surfaced as the current user activity.
• Fixed a SwiftUI issue where inactive non-opaque windows hosting glass content did not update backdrop content correctly.
• Fixed a virtualization issue where some new macOS Tahoe virtual machine installations could boot to a black screen.

• Background Assets can now report offline asset pack status with localStatus(ofAssetPackWithID:) and assetPackIsAvailableLocally(withID:).
• Background Assets can now make the latest asset pack version available locally with ensureLocalAvailability(of:requireLatestVersion:).
• Audio MIDI Setup now supports Network MIDI 2.0 sessions in the redesigned MIDI Network Setup panel.
• StoreKit adds revocationType and revocationPercentage fields to Transaction.

• Address Sanitizer and Thread Sanitizer might hang on macOS 26.4, iOS 26.4, tvOS 26.4, watchOS 26.4, and visionOS 26.4 when building with Xcode 26.3 or older.
• Some M1 Apple Silicon Macs might panic at boot when installing to an external disk.
• Exchange syncing for Calendar, Reminders, and Notes might fail; disabling Notes syncing can allow Calendar and Reminders to continue syncing.
• Deleting a boot volume from the Activation Lock window in macOS Recovery might not fully erase the disk.
• Jobs and Printer Status might not be reflected in Print Center.
• The availability version for FSVolume.MountOptions and FSVolume.requestedMountOptions is incorrect; these symbols are available starting in macOS 26.4.
• Multiple implicit SwiftUI animations affecting RealityKit component properties may not combine as expected.

• Use Xcode 26.4 when testing applications with Address Sanitizer or Thread Sanitizer.
• For Background Assets, offline status information is limited and not all status data is available without network access.
• For Exchange syncing issues, disable Notes syncing in Internet Accounts to continue Calendar and Reminders syncing.
• Use the booted OS’s “Erase All Content and Settings” instead of Recovery when deleting a boot volume from the Activation Lock window.
• On macOS 26.4 and later, modify com.apple.ResourceFork by replacing the entire 286-byte range or writing beyond the 286-byte offset on file systems without native extended attribute support.
• macOS Tahoe 26 is the last release to support Intel-based Macs; Rosetta support for apps ends after macOS 27.
• Organizations can control Rosetta notification behavior with the allowRosettaUsageAwareness key.

Product Information

Vendor: Apple

Product: macOS

Version: macOS Tahoe 26.4

Release date: Mar 16, 2026