macOS Sequoia 15.6.1 Update! Everything you need to know

macOS Sequoia 15.6.1 Update is now Available!

UPDATED:9/03/25

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

Apple just dropped the 6th minor release for Sequoia, macOS Sequoia 15.6.1 Update! Let’s jump in and find out what’s new.

UPDATE 09/01/25: OpenCore Legacy Patcher 2.4.1 Update just dropped!

This update patches an important security vulnerability. CVE-2025-43300

Impact: Processing a malicious image file may result in memory corruption. Apple is aware of a report that this issue may have been exploited in an extremely sophisticated attack against specific targeted individuals.

Description: An out-of-bounds write issue was addressed with improved bounds checking.

OpenCore Legacy Patcher for Unsupported Macs

OCLP 2.4.1 & macOS Sequoia 15.6.1 Update: = 2017 15″ MacBook Pro & 2013 Mac Pro (15.6 KDK) & 2011 17″ MacBook Pro (15.6 KDK)

OCLP 2.4.0 & macOS Sequoia 15.6.1 Update: = 2017 15″ MacBook Pro & 2013 Mac Pro (15.5 KDK) & 2011 17″ MacBook Pro (15.5 KDK) others in progress

Kernel Debug Kit (KDK) Status: = Only 15.5 as of now, still waiting on Apple
https://github.com/dortania/KdkSupportPkg/releases

MetallibSupportPkg Status: = MetallibSupportPkg-15.6.1-24G90.pkg
https://github.com/dortania/MetallibSupportPkg/releases

macOS Sequoia Patch Notes Summary

  • 1. New Features/Improvements – 0
  • 2. Operating System Bug Fixes – 0
  • 3. Security Fixes – 1
  • 4. Enterprise Changes – 0
  • 5. Safari Security (Webkit) – ?
  • 6. Full installer & Apple Silicon IPSW – Full installer InstallerAssistant.pkg & IPSW Apple Silicon Restore Files released!

Full Apple Update Release list

  1. Sequoia 15.6.1 (24G90)
  2. Sonoma 14.7.8 (23H730)
  3. Ventura 13.7.8 (22H730)
  4. iOS 18.6.2 (22G100)
  5. iPadOS 18.6.2 (22G100)
  6. iPadOS 17.7.10 (21H450)
  7. iOS 16.7.11 (20H360) – Remains Same
  8. iOS 15.8.4 (19H390)- Remains Same
  9. homePodOS 18.6 (22M84) – Remains Same
  10. tvOS 18.6 (22M84) – Remains Same
  11. visionOS 2.6 (22O785) – Remains Same
  12. watchOS 11.6 (22U84) – Remains Same

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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

  • 13. macOS Sequoia 15.6.1 (24G90) – 8/20/25
  • 12. macOS Sequoia 15.6 (24G84) – 7/28/25
  • 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 = 15.63GB

Apple Silicon Updates

Delta from macOS Sequoia 15.6 with size = 1.56GB

Intel Updates

Delta from macOS Sequoia 15.6 with size = 678.2MB

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 = Not Updated

  • 13. macOS Sequoia 15.6.1 = 11881.140.96
  • 12. macOS Sequoia 15.6 = 11881.140.96
  • 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 = Not Updated

  • 13. macOS Sequoia 15.6.1 = 11881.140.96
  • 12. macOS Sequoia 15.6 = 11881.140.96
  • 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 = Not Updated.

  • 13. macOS Sequoia 15.6.1 = 22.16.16083.0.0
  • 12. macOS Sequoia 15.6 = 22.16.16083.0.0
  • 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 = Not Updated.

  • 13. macOS Sequoia 15.6.1 = 2075.140.4.0.0
  • 12. macOS Sequoia 15.6 = 2075.140.4.0.0
  • 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 = Not Updated.

  • 13. macOS Sequoia 15.6.1 = Safari 18.6 (20621.3.11.11.3)
  • 12. macOS Sequoia 15.6 = Safari 18.6 (20621.3.11.11.3)
  • 11. macOS Sequoia 15.5 = Safari 18.5 (20621.2.5.11.8)
  • 10. macOS Sequoia 15.4.1 = Safari 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 15.6.1

Enterprise changes in macOS Sequoia

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

12. Security Content of macOS 15.6.1

Security vulnerabilities in this Update

Fixes addressed in this update = 1

https://support.apple.com/en-us/124927

Apple Security Update Page

https://support.apple.com/en-us/100100

13. macOS Sequoia 15.6.1 Update Release Notes

macOS Sequoia 15.6.1 Update

This update provides important security fixes and is recommended for all users.

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

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