macOS Sequoia 15.5 Update! Everything you need to know

macOS Sequoia 15.5 Update is now Available!

UPDATED: 5/12/25

This article will be continually updated as new information comes in.

Apple just dropped the 5th major release for Sequoia, macOS Sequoia 15.5 Update! Let’s jump in and find out what’s new.

One big fix that parents will like = “Parents now receive a notification when the Screen Time passcode is used on a child’s device.”

Also note that Apple has deprecated AFP (Apple Filing Protocol). The protocol dates all the way back to System 6 (AppleShare) 1988.

“Apple Filing Protocol (AFP) client is deprecated and will be removed in a future version of macOS.“

OpenCore Legacy Patcher for Unsupported Macs

OCLP 2.4.0 & macOS Sequoia 15.5 Update: = 2014 11″ MacBook Air

Kernel Debug Kit (KDK) Status: = Kernel_Debug_Kit_15.5_build_24F74.dmg
https://github.com/dortania/KdkSupportPkg/releases

MetallibSupportPkg Status: = MetallibSupportPkg-15.5-24F74.pkg
https://github.com/dortania/MetallibSupportPkg/releases

macOS Sequoia Patch Notes Summary

  • 1. New Features/Improvements – 1
  • 2. Operating System Bug Fixes –
  • 3. Security Fixes – 39
  • 4. Enterprise Changes – 6
  • 5. Safari Security (Webkit) – 8
  • 6. Full installer & Apple Silicon IPSW – Full installer InstallerAssistant.pkg & IPSW Apple Silicon Restore Files released!

Full Apple Update Release list

  1. Sequoia 15.5 (24F74)
  2. Sonoma 14.7.6 (23H626)
  3. Ventura 13.7.6 (22H625)
  4. iOS 18.5 (22F76)
  5. iPadOS 18.5 (22F76)
  6. iPadOS 17.7.7 (21H433)
  7. iOS 17.7.6 – Remains Same
  8. iOS 16.7.11 – Remains Same
  9. iOS 15.8.4 – Remains Same
  10. homePodOS 18.5 (22L572)
  11. tvOS 18.5 (22L572)
  12. visionOS 2.5 (22O473)
  13. watchOS 11.5 (22T572)

NOTE: I hate website ads, but this one small google ad below helps me with the cost of running Mr. Macintosh.com. Thank you

Table of Contents

  • 1. macOS Sequoia Apple Links
  • 2. macOS Sequoia Final Release History
  • 3. macOS Sequoia Full Installer.app
  • 4. Apple Silicon macOS Sequoia IPSW Restore file Database
  • 5. macOS Sequoia Update sizes
  • 6. Apple Silicon System Firmware Version
  • 7. Apple Silicon OS loader Version (iBoot)
  • 8. Intel T2 BridgeOS Update
  • 9. Intel T2 Firmware Update
  • 10. Safari Update
  • 11. What’s new for enterprise in macOS Sequoia
  • 12. Security Content of macOS Sequoia
  • 13. macOS Sequoia Release Notes / Patch Notes / Changes

Click “Continue Reading” for the rest of the article.

1. Apple macOS Links

When Apple releases the official macOS Sequoia support links, they will be listed below.

  1. What’s new in the updates for macOS Sequoia – https://support.apple.com/en-us/120283
  2. What’s new for enterprise in macOS Sequoia – https://support.apple.com/en-us/121011
  3. Apple Security Updates Page – https://support.apple.com/en-us/HT201222
  4. macOS Sequoia features page – https://www.apple.com/macos/macos-sequoia/
  5. Platform Security Guide – macOS Rapid Security Response system.
  6. Platform Guide Deployment – What’s new in Apple platform deployment
  7. AppleSeed Notes Link = appleseed.apple.com/
  8. Apple Developer Public Link = developer.apple.com/documentation/macos-release-notes
  9. macOS Deployment References Changes – https://support.apple.com/guide/deployment-reference-macos/document-revision-history-apd04dff7069/web

2. macOS Sequoia 15 Final Release History

  • 11. macOS Sequoia 15.5 (24F74) – 5/12/25
  • 10. macOS Sequoia 15.4.1 (24E263) – 4/16/25
  • 9. macOS Sequoia 15.4 (24E248) – 3/31/25
  • 8. macOS Sequoia 15.3.2 (24D81) – 3/11/25
  • 7. macOS Sequoia 15.3.1 (24D70) – 2/10/25
  • 6. macOS Sequoia 15.3 (24D60) – 1/27/25
  • 5. macOS Sequoia 15.2 (24C101) – 12/11/24
  • 4. macOS Sequoia 15.1.1 (24B91) – 11/19/24
  • 3. macOS Sequoia 15.1 (24B83) – 10/28/24
  • 2. macOS Sequoia 15.0.1 (24A348) – 10/04/24
  • 1. macOS Sequoia 15.0 (24A335) – 9/16/24

3. macOS Sequoia 15 Full Installer.app

Apple has released the full installer for macOS Sequoia. I list all the of the Full installers in the link below.

https://mrmacintosh.com/macos-sequoia-full-installer-database-download-directly-from-apple/

InstallAssistant.pkg = Full download. Installing this package will add the full “Install macOS Sequoia.app” to your applications folder.

4. Apple Silicon macOS Sequoia IPSW Restore file Database

Apple has released the full IPSW restore file of macOS for Apple Silicon M1,M2 & M3 Macs. I keep track of all of them in my Apple Silicon Firmware Database

Get them here –> https://mrmacintosh.com/apple-silicon-m1-full-macos-restore-ipsw-firmware-files-database/

5. macOS Sequoia Update sizes

Sequoia Delta Update

The delta update will automatically change in size for exactly what your macOS version needs.

Full update & Sequoia OCLP Users = 15.62GB

Apple Silicon Updates

Delta from macOS Sequoia 15.4.1 with size = 2.98GB

Intel Updates

Delta from macOS Sequoia 15.4.1 with size = 1.53GB

6. Apple Silicon System Firmware Version

This update has a new firmware update. The version number is reported in System Information under “System Firmware Version“

Apple Silicon Firmware = UPDATED!

  • 11. macOS Sequoia 15.5 = 11881.121.1
  • 10. macOS Sequoia 15.4.1 = 11881.101.1
  • 9. macOS Sequoia 15.4 = 11881.101.1
  • 8. macOS Sequoia 15.3.2 = 11881.81.4
  • 7. macOS Sequoia 15.3.1 = 11881.81.4
  • 6. macOS Sequoia 15.3 = 11881.81.2
  • 5. macOS Sequoia 15.2 = 11881.61.3
  • 4. macOS Sequoia 15.1.1 = 11881.41.5
  • 3. macOS Sequoia 15.1 = 11881.41.5
  • 2. macOS Sequoia 15.0.1 = 11881.1.1
  • 1. macOS Sequoia 15.0 = 11881.1.1

7. Apple Silicon OS loader Version (iBoot)

OS Loader Version (iBoot) also referred to as “iBoot second-stage loader”, is Apple’s stage 2 bootloader. The OS loader version will be the same as the “System Firmware Version” on the latest OS. On previous versions of macOS Monterey and Big Sur, the OS loader version will be a version behind. Example = Monterey = 7459.121.3 & Big Sur = 6723.140.2

OS Loader version = UPDATED!

  • 11. macOS Sequoia 15.5 = 11881.121.1
  • 10. macOS Sequoia 15.4.1 = 11881.101.1
  • 9. macOS Sequoia 15.4 = 11881.101.1
  • 8. macOS Sequoia 15.2.2 = 11881.81.4
  • 7. macOS Sequoia 15.3.1 = 11881.81.4
  • 6. macOS Sequoia 15.3 = 11881.81.2
  • 5. macOS Sequoia 15.2 = 11881.61.3
  • 4. macOS Sequoia 15.1.1 = 11881.41.5
  • 3. macOS Sequoia 15.1 = 11881.41.5
  • 2. macOS Sequoia 15.0.1 = 11881.1.1
  • 1. macOS Sequoia 15.0 = 11881.1.1

8. Intel T2 BridgeOS Update

The Version of BridgeOS for your T2 Security Chip (2018-2020 Intel Macs) was updated.

BridgeOS version = UPDATED!

  • 11. macOS Sequoia 15.5 = 22.16.15072.0.0
  • 10. macOS Sequoia 15.4.1 = 22.16.14248.0.0
  • 9. macOS Sequoia 15.4 = 22.16.14248.0.0
  • 8. macOS Sequoia 15.3.2 = 22.16.13060.0.0
  • 7. macOS Sequoia 15.3.1 = 22.16.13051.0.0
  • 6. macOS Sequoia 15.3 = 22.16.13051.0.0
  • 5. macOS Sequoia 15.2 = 22.16.12093.0.0
  • 4. macOS Sequoia 15.1.1 = 22.16.11072.0.0
  • 3. macOS Sequoia 15.1 = 22.16.11072.0.0
  • 2. macOS Sequoia 15.0.1 = 22.16.11053.5.1,0
  • 1. macOS Sequoia 15.0 = 22.16.11053.5.1,0

9. Intel T2 Firmware Update

The version of firmware for your Mac (2018-2020 Intel Macs) was updated.

Firmware version = UPDATED!

  • 11. macOS Sequoia 15.5 = 2075.120.2.0.0
  • 10. macOS Sequoia 15.4.1 = 2075.101.2.0.0
  • 9. macOS Sequoia 15.4 = 2075.101.2.0.0
  • 8. macOS Sequoia 15.3.2 = 2069.80.3.0.0
  • 7. macOS Sequoia 15.3.1 = 2069.80.3.0.0
  • 6. macOS Sequoia 15.3 = 2069.80.3.0.0
  • 5. macOS Sequoia 15.2 = 2069.40.2.0.0
  • 4. macOS Sequoia 15.1.1 = 2069.40.2.0.0
  • 3. macOS Sequoia 15.1 = 2069.40.2.0.0
  • 2. macOS Sequoia 15.0.1 = 2069.40.2.0.0
  • 1. macOS Sequoia 15.0 = 2069.40.2.0.0

10. Safari Update

The new version of Safari 18 is included in the macOS 15 update.

Safari = UPDATED!

  • 11. macOS Sequoia 15.5 = 18.5 (20621.2.5.11.8)
  • 10. macOS Sequoia 15.4.1 = 18.4 (20621.1.15.11.10)
  • 9. macOS Sequoia 15.4 = Safari 18.4 (20621.1.15.11.10)
  • 8. macOS Sequoia 15.3.2 = Safari 18.3.1 (20620.2.4.11.6)
  • 7. macOS Sequoia 15.3.1 = Safari 18.3 (20620.2.4.11.5)
  • 6. macOS Sequoia 15.3 = Safari 18.3 (20620.2.4.11.5)
  • 5. macOS Sequoia 15.2 = Safari 18.2 (20620.1.16.11.8)
  • 4. macOS Sequoia 15.1.1 = Safari 18.1.1 (20619.2.8.11.12)
  • 3. macOS Sequoia 15.1 = Safari 18.1 (20619.2.8.11.10)
  • 2. macOS Sequoia 15.0.1 = Safari 18.0.1 (20619.1.26.31.7)
  • 1. macOS Sequoia 15.0 = Safari 18.0 (20619.1.26.31.6)

11. What’s new for Enterprise in macOS 15.5

Enterprise changes in macOS Sequoia

  • macOS now supports the DHCPv6 Fully Qualified Domain Name option.
  • The Location Services pane is no longer incorrectly skipped during setup when MDM skips user creation and a user is created outside of Setup Assistant.
  • Resolves an issue where Mac computers updating from macOS 15.4 with Platform SSO configured may start up in Recovery until FileVault is disabled.
  • Resolves an issue where Command Center presents repeated alerts that a screen-sharing application is accessing your screen.
  • Platform SSO keys no longer fail attestation.
  • Apple Filing Protocol (AFP) client is deprecated and will be removed in a future version of macOS.

https://support.apple.com/en-us/121011

12. Security Content of macOS 15.5

Security vulnerabilities in this Update

Fixes addressed in this update = 39

https://support.apple.com/en-us/122716

https://support.apple.com/en-us/122373

13. macOS Sequoia 15.5 Update Release Notes

This release also includes other features, bug fixes, and security updates for your Mac.

This update includes enhancements, bug fixes, and security updates for your Mac.

Parents now receive a notification when the Screen Time passcode is used on a child’s device

For information on the security content of Apple software updates, please visit this website: https://support.apple.com/100100

Liked it? Take a second to support Mr. Macintosh on Patreon!
Become a patron at Patreon!