MacOS High Sierra 10.13.3 Update, Security Update 2018-001 for Sierra & El Capitan Released to Mac Users

MacOS High Sierra 10.13.3 Update, Security Update 2018-001 for Sierra & El Capitan Released to Mac Users

macOS High Sierra 10.13.3

Apple has released the final version of macOS High Sierra 10.13.3 for Mac users running the High Sierra operating system. Apple has also released security updates for Mac users running MacOS Sierra and Mac OS X El Capitan, along with iOS 11.2.5 for iPhone and iPad, and updates to watchOS and tvOS.


The macOS High Sierra 10.13.3 release appears to mostly focus on bug fixes and security enhancements, whereas the security updates for Mac OS El Capitan 10.11.6 and Mac OS Sierra 10.12.6 are specifically aimed at mitigating the Spectre and Meltdown security flaws. No new features are expected to be included in the system software updates. Safari 11.0.3 is also available for El Capitan and Sierra.

How to Download and Install macOS High Sierra 10.13.3 Update

Be sure to backup the Mac before installing a system software update, this is made simple with Time Machine on a Mac.

  1. Go to the  Apple menu in the upper left corner, and choose “App Store”
  2. Select the “Updates” tab, and choose to download and update “macOS 10.13.3 Update” when it becomes available

The High Sierra system software update is labeled with the update label “macOS 10.13.3 Update 10.13.3” in the Mac App Store.

Mac users running macOS Sierra 10.12.6 or Mac OS X El Capitan 10.11.6 will discover “Security Update 2018-001 10.12.6” and “Security Update 2018-001 10.11.6” in the Updates section of the Mac App Store as well as an update to Safari 11.0.3.

Security Update 2018-001 for Sierra and El Capitan

Mac users can also download the macOS High Sierra 10.13.3 Combo Update or the regular update as a package file, or the individual security update packages for El Capitan and Sierra, from the Apple Support downloads page here. You can read about using combo updates if interested.

MacOS High Sierra 10.13.3 Release Notes

Release notes accompanying the App Store download for High Sierra 10.13.3 are very brief, as follows:

– Addresses an issue that could cause Messages conversations to be listed out of order

– Resolves an issue that could cause your Mac to stop responding when connected to an SMB server

Lengthier security related release notes are available here for those interested.

Separately, Apple has also released iOS 11.2.5 update for iPhone and iPad, along with watchOS 4.2.2 for Apple Watch, and tvOS 11.2.5 for Apple TV.

MacOS High Sierra 10.13.3 Update, Security Update 2018-001 for Sierra & El Capitan Released to Mac Users

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