What Changed in macOS 27.0.1
Apple published no developer release notes for macOS 27.0.1, which is normal for a release that carries security fixes and nothing an app would notice. Nobody outside Apple can list its changes, and this page will not invent them.
macOS 27.0.1 shipped as build 26A434 on September 28, 2026.
macOS 27.0.1 Build Numbers
macOS 27.0.1 is build 26A434 on every device that runs it. To check what you are on, open System Settings → General → About and tap the version number.
Apple shipped it alongside iOS 27.0.1, iPadOS 27.0.1, visionOS 27.0.1, watchOS 27.0.1 the same day — the platforms move together even when the build numbers do not match.
| Platform | Version | Build | Released |
|---|---|---|---|
| macOS | 27.0.1 | 26A434 | September 28, 2026 |
| iOS | 27.0.1 | 24A446 | September 28, 2026 |
| iPadOS | 27.0.1 | 24A446 | September 28, 2026 |
| visionOS | 27.0.1 | 24M372 | September 28, 2026 |
| watchOS | 27.0.1 | 24R365 | September 28, 2026 |
Which Devices Run macOS 27.0.1
macOS 27.0.1 runs on every device that runs macOS 27: 7 models. A point release never changes the supported list — if macOS 27 reached your device, macOS 27.0.1 does too.
The 4 models that stopped at the previous version stay there, on security updates. The full compatibility list covers every platform, and this checker answers it for one device.
- MacBook Neo (2026)
- MacBook Air with Apple silicon (2020 and later)
- MacBook Pro with Apple silicon (2020 and later)
- iMac with Apple silicon (2021 and later)
- Mac mini with Apple silicon (2020 and later)
- Mac Studio (2022 and later)
- Mac Pro (2023)
How to Install macOS 27.0.1
Open System Settings → General → Software Update → Beta Updates and install it like any other update. There is nothing to download first and no profile involved — Apple removed beta profiles in 2023, and a shipped release never needed one anyway.
If the update does not appear, it is usually one of three things: the rollout has not reached your device yet (Apple releases in waves over a few days), the device is below the storage the installer needs, or it is enrolled in a beta channel that is already ahead of this version. Our guide to an update that will not show up works through each.
Can You Still Install macOS 27.0.1 Today?
Apple signs what it is currently shipping, and the newest macOS 27 build it signs today is macOS 27.2 (26B123). Restoring to an older build is refused at the final step whatever file you use — the catalogue shows which ones are still open.
This matters for going back, not for going forward: a device already on macOS 27.0.1 stays there until the next update. Our downgrade guide covers what is possible and what is not.
Frequently Asked Questions
What's new in macOS 27.0.1?
Apple published no release notes for macOS 27.0.1. It carries the usual security fixes, and no feature list exists — any site publishing one is guessing.
When was macOS 27.0.1 released?
September 28, 2026.
What is the build number for macOS 27.0.1?
26A434. Settings → General → About, then tap the version number to see it.
Should I update to macOS 27.0.1?
It is a shipped release rather than a beta, so the usual beta cautions do not apply: apps are built against it and it carries the security fixes of everything before it. The one reason to wait is a device you cannot afford to be without for an hour. Back up first either way.
Can I go back to the previous version after installing macOS 27.0.1?
Only to a build Apple is still signing, and only by erasing the device and restoring from an IPSW. The catalogue shows what is signed right now.
Does macOS 27.0.1 fix battery drain?
Heavy battery use for a day or two after any update is re-indexing, not a fault, and it settles. Apple published no notes for macOS 27.0.1, so nobody outside Apple can say.
Is there a beta profile for macOS 27.0.1?
No, and there is nothing to install: macOS 27.0.1 is a public release that arrives through Software Update. Apple removed beta profiles in 2023.
What came after macOS 27.0.1?
macOS 27.2, on October 26, 2026. Its page has the same detail.
