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  • Post published:07/02/2022
  • Post last modified:07/02/2022
macOS Big Sur 11.6.3 & Safari 15.3 Released

macOS Big SurmacOS Big Sur

Apple has released macOS Big Sur 11.6.3, Safari 15.3 for both macOS Big Sur and macOS Catalina, and Security Update 2022-001 Catalina, to users running prior versions of Macintosh operating systems.


Mac users running Monterey will instead find macOS Monterey 12.2 update available to download, which includes the same security patches and the latest Safari version, while iPhone and iPad users will find iOS 15.3 and iPadOS 15.3 with the same fixes.

Each of these updates are primarily patching security issues or bugs, including fixing the browser data leaking issue in Safari that generated some recent press.

How to Download MacOS Big Sur 11.6.3 & Safari 15.3

Don’t forget to backup to Time Machine before installing system software updates.

If you’re still running macOS Big Sur you can continue to get macOS Big Sur updates like 11.6.3, but you have to ignore the Monterey promotion and use a slightly different method of updating system software:

  1. Go to the  Apple menu and choose “System Preferences”
  2. Select “Software Update”
  3. Ignore the macOS Monterey update option, and instead choose the small blue “More Info” text under ‘Other Updates Available
  4. Make sure the boxes for macOS Big Sur 11.6.3 update, and for Safari 15.3 are checked, and select to ‘Install Now’

Note: If you are still running macOS Catalina, you will find Safari 15.3 and Security Update 2022-001 Catalina available as updates instead.

macOS Big Sur update DownloadmacOS Big Sur update Download


Installing the updates will require the Mac to restart.

macOS Big Sur 11.6.3 Release Notes

macOS Big Sur 11.6.3

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

You can read more about macOS Big Sur 11.6.3 security content here: https://support.apple.com/en-us/HT213055

If you are interested in reading more about the Security Update 2020-001 Catalina you can find that here: https://support.apple.com/en-us/HT213056

Just about every other modern Apple device also received software updates today as well, including Apple Watch with watchOS 8.4, Apple TV 15.3, HomePod 15.3, iPhone, iPad, iPod touch with iOS 15.3 and iPadOS 15.3, and Macs with macOS Monterey 12.2.

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