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

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

Which macOS version is installed?

From 10.5 on, OS X comes with a new, application-oriented firewall instead of ipfw. But ipfw is still installed. If you have trouble with its syntax, check out graphical frontends like WaterRoof or Flying Buttress. When you use a Mac, iPad, iPhone, or Apple Watch, you’re able to do incredible things. And when you use them together, you can do so much more. Make and receive phone calls without picking up your iPhone. Use your iPad to extend the workspace of your Mac. Automatically unlock your Mac when you’re wearing your Apple Watch.

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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 one?

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 will be updated to show the latest version of that macOS.

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.

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