Is your Mac up to date with the latest version of the Mac operating system (macOS or OS X)? Is it using the version required by some other product 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.

The window below should appear. In line 1 (Mac OS X Update) you should see under version 10.9.1. (Ignore the other options for now). Make sure the blue box in front of Mac OS X Update is ticked and all others un-ticked. Finally, there are 3 buttons at the bottom of this window looking like this. Get the best deals on Apple MacBook Mac OS X 10.6, Snow Leopard Laptops and find everything you'll need to improve your home office setup at eBay.com. Fast & Free shipping on many items! The new Find My app combines Find My iPhone and Find My Friends into a single, easy-to-use app that’s now available on the Mac. Use it to locate your friends and family, share your location, and find missing devices—even if they’re offline. MacBook Air Late-2010 supports the latest operating system - macOS Sierra. To upgrade to macOS Sierra, you will need to upgrade to El Capitan first.To upgrade to El Capitan, from MacOs X Snow Leopard,  follow these steps:Get El Capitan from App StoreClick the Get button on the El Capitan page. This download will take 2-3 hours depending on the Internet speed.

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 Mojave, followed by its version number. If you need to know the build number as well, click the version number to see it.

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This example shows macOS Catalina version 10.15 build 19A583.

What is the latest macOS version?

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 Catalina. 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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Learn more

• Always use the macOS that came with your Mac, or a compatible newer version.
• How to get old versions of macOS.
• Find out how to reinstall macOS from macOS Recovery.