macOS Sequoia 15.6 Update! Everything you need to know

macOS Sequoia 15.6 Update is now Available!

UPDATED: 8/09/25

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

Apple just dropped the 6th major release for Sequoia, macOS Sequoia 15.6 Update! Let’s jump in and find out what’s new.

OpenCore Legacy Patcher for Unsupported Macs

OCLP 2.4.0 & macOS Sequoia 15.6 Update: = 13 different Mac models tested good. I had a few issues with my 5,1 but they worked out. My 2008 15″ MacBook Pro on the other hand does not boot with 2.4.0 root patches.

Kernel Debug Kit (KDK) Status: = Still waiting on Apple to release 15.6 KDK!
https://github.com/dortania/KdkSupportPkg/releases

MetallibSupportPkg Status: = MetallibSupportPkg-15.6-24G84.pkg
https://github.com/dortania/MetallibSupportPkg/releases

macOS Sequoia Patch Notes Summary

  • 1. New Features/Improvements – 0?
  • 2. Operating System Bug Fixes – 1
  • 3. Security Fixes – 72
  • 4. Enterprise Changes – 6
  • 5. Safari Security (Webkit) – 9
  • 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 (24G84)
  2. Sonoma 14.7.7 (23H723)
  3. Ventura 13.7.7 (22H722)
  4. iOS 18.6 (22G86)
  5. iPadOS 18.6 (22G86)
  6. iPadOS 17.7.9 (21H446)
  7. iOS 16.7.11 – Remains Same
  8. iOS 15.8.4 – Remains Same
  9. homePodOS 18.6 (22M84)
  10. tvOS 18.6 (22M84)
  11. visionOS 2.6 (22O785)
  12. watchOS 11.6 (22U84)

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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

  • 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 = 15.62GB

Apple Silicon Updates

Delta from macOS Sequoia 15.5 with size = 2.84GB

Intel Updates

Delta from macOS Sequoia 15.5 with size = 1.43GB

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!

  • 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 = UPDATED!

  • 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 = UPDATED!

  • 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 = UPDATED!

  • 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 = UPDATED!

  • 12. macOS Sequoia 15.6 = 18.6 (20621.3.11.11.3)
  • 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 15.6

Enterprise changes in macOS Sequoia

  • The softwareupdate —fetch-full-installer command completes successfully.
  • Mac computers no longer fail to obtain an IP address through DHCP when using a transparent proxy network extension.
  • Setup Assistant completes successfully if the user attempts to migrate data from a computer or backup and device management skips both Terms and Conditions and data migration.
  • Resolves an issue where Mac computers may boot to Recovery after installing a software update.
  • Platform SSO enrollment no longer fails when an associated domains configuration is required.
  • The authentication timeout is increased when manually entering 802.1X credentials.

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

12. Security Content of macOS 15.6

Security vulnerabilities in this Update

Fixes addressed in this update = 71

https://support.apple.com/en-us/124149

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

13. macOS Sequoia 15.6 Update Release Notes

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

macOS Sequoia 15.6 Update

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

Developer notes for 15.6: Fixed: Finder and Apple Configurator may be unable to successfully restore some devices from DFU mode.

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

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