macOS 15 Sequoia Release Information

Sequoia Release Information

Apple's most recent operating system, macOS 15 Sequoia, comes pre-installed on new Macs and is available as an upgrade for compatible Macs. For a full listing of new features, please visit the official macOS Sequoia information page.

OIT's Recommendation: Wait to upgrade to macOS 15 Sequoia

As is often the case when new operating systems are first released, there are incompatibilities with a number of widely used applications for campus Mac users. At this time, OIT is still testing compatibility with CU Boulder services and applications and therefore recommends faculty, staff, and students wait to upgrade Apple devices to macOS 15 Sequoia. We will update this page as we find more information about compatibility issues.

OIT recommends that before upgrading to any new operating system, ensure your most used applications are compatible by checking the compatibility testing information below, or by contacting the vendor directly.

If you buy a new Mac or choose to upgrade and run into problems that cannot be resolved, you may need to revert to an earlier version of macOS, which entails backing up your files and doing a fresh install. 

If you need assistance or have other questions, please schedule an appointment to bring your computer to the OIT Buff Techs Walk-In Center, contact Dedicated Desktop Support, or contact the IT Service Center at 303-735-4357 or oithelp@colorado.edu.

Dedicated Desktop Support Customers

Mac systems enrolled in Dedicated Desktop Support will be prevented from upgrading to macOS 15 Sequoia via Self Service for the time being. After macOS 15 has been fully tested and we are ready to support the new operating system, DDS users will begin getting prompted to upgrade. If you are supported by DDS and have any questions, please contact your DDS Technician.

Known Compatibility Issues 

Compatibility with CU Boulder Wi-Fi Networks

At this time, OIT's recommendation is to wait to upgrade to the latest Apple OS release. If you decide to update, please be aware that a new network feature in macOS 15 Sequoia and iOS 18 called Private Wi-Fi Address could cause issues when using campus wireless networks. The same is true if you update your iPad, iWatch or VisionPro.
 

• If you choose to update to macOS 15, you will likely be required to re-register on UCB Wireless. After upgrading, we strongly recommend setting the Private Wi-Fi Address to "off" for the UCB Wireless, UCB Guest, and eduroam networks to avoid frequent registration prompts and connectivity issues.
   
• On iOS 18 and iPadOS 18, if you had Private Wi-Fi Address turned on in the past, the update may require you to re-register; we still recommend turning this setting to "off." If you had Private Wi-Fi Address turned off before updating on iOS, the setting should remain off post-update and you should not need to take further action.
   

Because this is a per-network setting, OIT's recommendations are only for CU Boulder networks. For all campus Wi-Fi users with an IdentiKey, we continue to recommend that you connect to UCB Wireless rather than UCB Guest. As OIT investigates the network performance impacts of macOS 15 Sequoia, OIT also recommends that eduroam users turn off Private Wi-Fi Address at this time for better stability. Visit Apple's website for more information about Private Wi-Fi addresses.

Compatibility Issues & Testing

Compatibility of macOS 15 Sequoia is currently being tested by OIT. If additional compatibility issues with campus services and supported software arise, we will report the results on this page. Before you upgrade to Sequoia, check this page to ensure compatibility with software, services, and systems you use the most.