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In September 2024, Apple released the latest version of their operating system, macOS 15 Sequoia, to the general public.

Important: If you're not yet ready for macOS 15 Sequoia, there are two settings to deliver to your MDM-enrolled macOS devices to prevent it from being installed.

To fully block the upgrade to macOS 15 Sequoia, configure two settings:

1. To prevent the update from appearing on individual devices fromin System Settings > Software Update, use Delay Major macOS Software Upgrades. Users with this policy set will not see macOS 15 Sequoia as an available upgrade.

2. Restrict the macOS Sequoia installer from running using the Block macOS Sequoia Installer Policy. Users are allowed to download the installer, but the installer will be blocked from launching. 

Prerequisites:

• macOS devices must be enrolled in MDM to deliver patch policies. See Get Started: Apple MDM.

Delay Major macOS Upgrades

Delay macOS Upgrades Using Patch Management Policies

ºÚÁϺ£½Ç91Èë¿Ú’s patch policies (Policy Management > Patch Management) help organizations manage their operating system versions, including managing new major version releases. The Major Upgrade Settings section allows you to specify a delay of up to 90 days for new major versions of macOS. See Create a macOS Patch Policy.

To add a delay, make sure Defer Upgrade Releases is selected, and then set a number of days from 1 to 90. The default is 30 days.

For each policy in your patch rings (Vanguard, Early Adoption, General Adoption, Late Adoption), update the Major Upgrade Settings if you need to delay macOS 15 Sequoia.

Automatic Action Changes

ºÚÁϺ£½Ç91Èë¿Ú has implemented updated automatic actions for devices running older versions of macOS, which will allow admins to target older versions of macOS to upgrade automatically to macOS 15 Sequoia.

Delay macOS Upgrades Without Patch Management Policies

For customers not using Patch Management, you can access Apple’s Delay Major OS Upgrade settings through ºÚÁϺ£½Ç91Èë¿Ú's Delay Major macOS Software Upgrades policy. 

To create a Delay Major macOS Software Upgrades policy:

1. Log into your .
2. Go to DEVICE MANAGEMENT > Policy Management.
3. In the All tab, click (+).
4. On the New Policy panel, select the Mac tab.
5. Select the Delay Major MacOS Software Upgrades policy from the list, then click configure.
6. (Optional) Add details or context regarding this policy to the Policy Notes.
7. Under Settings, select Force Delayed Major Software Updates to delay major OS software updates from appearing for the length of time you specify in Software Upgrade Delay Days.
8. For Software Upgrade Delay Days, specify the number of days to delay the software upgrade. The minimum value is 1 and the maximum is 90.
9. (Optional) Select the Policy Groups tab and select one or more policy groups that will include this policy.
10. Select the Device Groups tab and select one or more device groups where you’ll apply this policy. For device groups with multiple OS member types, the policy is applied only to the supported OS.
11. Select the Devices tab and select one or more devices where you’ll apply this policy.
12. Click save.

Block macOS Sequoia Installer Policy

This policy prevents the macOS Sequoia installer from running on devices. If users have downloaded the installer via the App Store or other methods, the installer will be blocked from launching.

To create a Block macOS Sequoia installer policy:

1. Log into your .
2. Go to DEVICE MANAGEMENT > Policy Management.
3. In the All tab, click (+).
4. On the New Policy panel, select the Mac tab.
5. Select the Block MacOS Sequoia Installer policy from the list, then click configure.
6. (Optional) Select the Policy Groups tab and select one or more policy groups that will include this policy.
7. Select the Device Groups tab and select one or more device groups where you’ll apply this policy. For device groups with multiple OS member types, the policy is applied only to the supported OS.
8. Select the Devices tab and select one or more devices where you’ll apply this policy.
9. Click save.