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About macOS 26 "Tahoe"

macOS 26 ("Tahoe") became available on September 15th, 2025.

With the release of Tahoe, Apple stopped delivering updates for macOS versions below 14, therefore all macOS versions below 14 are now unsupported. If your Mac still runs a macOS version below 14 you should upgrade to a supported version of macOS as soon as possible!

For Apple's overview of the new features in macOS 26 please see this document.

Tahoe is the last macOS version to support Intel processors and the first to use its release year as its version number.

There are some important actions to take before you install it:

  • Take note of the information on https://support.apple.com/en-us/HT212735.
  • Ensure that all the software you are using is compatible with macOS 26. See below for a list of known issues (be aware that the list is far from complete).
  • Make sure to update all the third party software you are using BEFORE upgrading to macOS 26. Expect that many updaters of older software may NOT WORK any more under macOS 26.
  • Uninstall outdated software and all software you don't use anymore BEFORE upgrading to macOS 26. Expect that most uninstallers for outdated software may NOT WORK any more under macOS 26.
  • Verify your hard disk before doing the install. This can be done using built-in Disk Utility.app -> First Aid.
  • Make sure you have stored your data in CERNbox or have a recent backup, allowing you to recover your data in case of problems. We generally recommend to store all your data in CERNbox.

Known Issues

ESET ES

ESET ES v8.1.200.0 (or earlier) was initially not compatible with macOS 26 and would display a notification preventing you from using the application or updating it via UI. You should update to version 9.x before upgrading to Tahoe. There is a separate upgrade policy created in Self Service to do that.