How can I update my OS X Yosemite. It's a late 2013
My browers all say I need to update my software program but my Mac says there isn't an update. Is there an update for the OS X Yosemite? My computer is an iMac late 2013
iMac 21.5″, OS X 10.10
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A late 2013 iMac can be upgraded to Catalina 10.15.7 but no later. See: How to download macOS - Apple Support
Note that if you upgrade to Catalina, you will also need to update any non-Apple 32-bit apps. To see if you have any you can use: https://www.stclairsoft.com/Go64/
Also note that with Catalina you will still not have a completely up-to-date browser. You may want to consider using a 3rd party browser that will allow you to use a current version. One option is Chrome: https://www.google.com/chrome/