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1. In keeping with Apple's release cycle, Apple will stop releasing new security updates for macOS High Sierra 10.13 following its full release of macOS Big Sur. Furthermore, Microsoft has made the announcement of ending support for macOS High Sierra 10.13 on.
2. Available for: macOS Sierra 10.12.6, macOS High Sierra 10.13.6, macOS Mojave 10.14.4. Impact: An application may be able to read restricted memory. Description: A validation issue was addressed with improved input sanitization. CVE-2019-8603: Phoenhex and qwerty (@niklasb, @qwertyoruiopz, @bkth) working with Trend Micro's Zero Day Initiative.
3. And the first release of macOS High Sierra was on 2016, macOS High Sierra was named as an operating system the Sierra Nevada the big mountain which exists on California America, macOS High Sierra is consist of high quality and better app performance and as well this operating system is.

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The first beta of macOS Sierra was released to developers shortly following the 2016 WWDC keynote on June 13, 2016. The first public-beta release followed on July 7, 2016. It was released to end users on September 20, 2016, as a free upgrade through the Mac App Store and it was succeeded by macOS High Sierra on September 25, 2017.

Is your Mac up to date with the latest version of the Mac operating system? Is it using the version required by some product that you want to use with your Mac? Which versions are earlier (older) or later (newer, more recent)? To find out, learn which version is installed now.

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If your macOS isn't up to date, you may be able to update to a later version.

Which macOS version is installed?

From the Apple menu  in the corner of your screen, choose About This Mac. You should see the macOS name, such as macOS Big Sur, followed by its version number. If you need to know the build number as well, click the version number to see it.

Which macOS version is the latest?

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These are all Mac operating systems, starting with the most recent. When a major new macOS is released, it gets a new name, such as macOS Big Sur. As updates that change the macOS version number become available, this article is updated to show the latest version of that macOS.

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If your Mac is using an earlier version of any Mac operating system, you should install the latest Apple software updates, which can include important security updates and updates for the apps that are installed by macOS, such as Safari, Books, Messages, Mail, Music, Calendar, and Photos.