Apple Releases macOS Tahoe 26.5.1 to Fix Shutdown Issue Affecting Enterprise Users on M5 Macs

[MacRumors]

Apple today released macOS Tahoe 26.5.1, a small update to the macOS Tahoe operating system that came out last year. macOS Tahoe 26.5.1 comes three weeks after Apple released macOS Tahoe 26.5.

Mac owners can download the software by opening the System Settings app and then navigating to the Software Updates section.

According to Apple's release notes for the update, macOS Tahoe 26.5.1 addresses an unexpected shutdown issue affecting certain enterprise users on M5 Macs.

This update addresses an issue for enterprise users where Macs with an M5 chip could expectedly shut down when using certain content filtering network extensions.

macOS 27 is right around the corner, with Apple set to unveil the next major macOS update at the WWDC 2026 keynote on Monday, June 8.

Article Link: Apple Releases macOS Tahoe 26.5.1 to Fix Shutdown Issue Affecting Enterprise Users on M5 Macs

 

[podycust]

Hmmm in the article it say expectedly lol

 

[tywebb13]

build number is 25F80

 

[timmywa]

I would assume this is only for m5 MacBooks, then? I am not seeing it come up on my m4 mba...

 

[tywebb13]

ipsw:

https://updates.cdn-apple.com/2026SpringFCS/fullrestores/122-88870/E47EBB85-45F2-4E3C-B9E7-6FF7868C2FBA/UniversalMac_26.5.1_25F80_Restore.ipsw

full installer:

https://swcdn.apple.com/content/downloads/22/07/122-84023-A_RQPL3GX2L6/l6vt7agjz206oaiyhvc0a4wupeffjk36st/InstallAssistant.pkg

 

[xpxp2002]

This update came up on my M4 MBP.

 

[PotentPeas]

Not showing for me yet, though assuming that it is just an update server sync delay …?

[Edit] It did show up 15 minutes later.

 

[bcomer]

Available for my M2U Studio.

 

[segfaultdotorg]

Is this only for the M5 models? Or did they stop supporting the M4? It's not showing for my M4.

 

[Weaselboy]

Is this only for the M5 models? Or did they stop supporting the M4? It's not showing for my M4.

It is showing on my M4 Pro MBP.

 

[tywebb13]

Is this only for the M5 models? Or did they stop supporting the M4? It's not showing for my M4.

it should be for more macs.

just because they list a fix for 1 thing in release notes for one particular mac doesn't always mean update is just for that mac.

often there are other unlisted fixes applicable to other macs too.

 

[Icelus]

Sounds a lot like a fix in 26.5

Resolved an issue where MacBook Air with M5 and MacBook Pro with M5 Pro or M5 Max restarted unexpectedly when using some content filter extensions.

What's new for enterprise in macOS Tahoe 26 - Apple Support

Learn about the enterprise content that Apple has released for macOS Tahoe 26.

support.apple.com

 

[DaveMcM76]

Is this only for the M5 models? Or did they stop supporting the M4? It's not showing for my M4.

Showing on my M1 Mac mini so I'd say it's for at least all Apple Silicon Macs.

 

[gummybear2026]

Holding off this update, only really helps M5 macs.

 

[sw1tcher]

I would assume this is only for m5 MacBooks, then? I am not seeing it come up on my m4 mba...

I think it's for anyone who downgraded to macOS 26

 

[Astuces iOS]

It better fix the 120hz and the Mission Control bug or I will be angry.

 

[Happy_John]

Is it an update all Macs running OS26 will get, or only Macs with M5 chips?

 

[jontalk5]

I would assume this is only for m5 MacBooks, then? I am not seeing it come up on my m4 mba...

I just updated my Mac Mini M1 a moment ago..must be very small since it was super quick

 

[SantaFeNM]

Shows up for my M3 MacBook Air. 🤷‍♂️

 

[polyphenol]

It is available on my M1 MBP.
I'm hoping it addresses the issue on this machine, and my M4 mini failing, to unlock using my Apple Watch. Which was working fine until very recently. Now it tends to say it is using my watch, but then goes back to ask for password.

 

[BBQINMAY]

This crap is still unable to send SMS from the Mac...

 

[mcrinsane]

This crap is still unable to send SMS from the Mac...

I've had no issues sending SMS from my Mac for as long as it was possible to do so (at least 5 years?) In fact I just send one to a friend with Android that doesn't support RCS, using Messages on my Mac Studio running Tahoe 26.5. Green bubble. I routinely get notification SMS texts from my doctors, reminding me about appointments, etc, those are SMS and I reply to confirm all the time. What you may have to do is delete the conversation on your iphone (it should disappear on your Mac as well), and start a new conversation. When RCS support came out several years ago, existing conversations that were previously SMS, sometimes had to be deleted. When starting a new conversion, RCS support was recognized, and all messages moving forward were RCS enabled. On your iPhone make sure the option 'Use SMS when iMEssage not available' is enabled

 

[mcrinsane]

Holding off this update, only really helps M5 macs.

I would not assume that. The update is showing up for my M1, M2 and M4 Macs.

 

[nt5672]

I would not assume that. The update is showing up for my M1, M2 and M4 Macs.

And Apple is notorious for not including any embarrassing bug fixes in the release notes.

 

[CoMoMacUser]

Showing up on my M2 MBA and says it will take about 20 minutes to install.