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  • Post published:16/10/2021
  • Post last modified:16/10/2021
MacOS Big Sur 11.6 Released for Mac with Security Fixes

macOS Big Sur 11.6macOS Big Sur 11.6

Apple has released macOS Big Sur 11.6 for all Mac users running the Big Sur operating system, the update includes important security fixes for Mac, and is therefore recommended for all users to install.


Additionally, Mac users running Catalina and Mojave will find security updates available for their Macs, labeled as Safari 14.1.2 and Security Update 2021-005 Catalina.

Separately, Apple has also released iOS 14.8 and iPadOS 14.8 for iPhone and iPad, which apparently contain the same security updates for those devices.


MacOS Big Sur 11.6 apparently contains security fixes, but no specific information is included, though typically major point release updates also include bug fixes. The lack of details is similar to the vague release of macOS 11.5.2.

All Mac users running Big Sur are recommended to install 11.6, and aside from the stated security fixes, perhaps it will also address some lingering issues with Big Sur for some users.

How to Download MacOS Big Sur 11.6 Update

Before updating, backup the Mac with Time Machine. Failure to backup could lead to data loss.

  1. Go to the  Apple menu, then choose “System Preferences”
  2. Select “Software Update”
  3. Choose to “Update Now” for macOS Big Sur 11.6

macOS Big Sur 11.6 updatemacOS Big Sur 11.6 update

Mac users running Catalina or Mojave will find security updates available instead, available as Safari 14.1.2, and Security Update 2021-005 Catalina.


Despite being apparently a small security update release, MacOS Big Sur 11.6 is a rather large download, weighing around 2.6GB and 3.8GB, depending on the target Mac.

The Mac must reboot to complete installation.

Downloading a Full MacOS Big Sur 11.6 Installer File

Users can also choose to download a complete macOS 11.6 installer package file if desired. This may be useful if you’re updating several Macs on a network, if you don’t want to have to re-download the installer multiple times.

  • macOS Big Sur 11.6 installer.pkg

The installer pkg file for 11.6 will place the “Install macOS Big Sur.app” for 11.6 into your Applications folder.

macOS Big Sur 11.6 Release Notes

Release notes accompanying macOS Big Sur 11.6 are quite brief, as has been the norm lately:

macOS Big Sur 11.6 — Restart Required

This update is recommended for all users and improves the security of macOS.

For more information on the security content of this update see https://support.apple.com/kb/HT201222

If you notice anything different, noteworthy, or interesting in macOS Big Sur 11.6, let us know!

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