I would like to update Safari to version 16.
Can I upgrade my IMac27 to Safari Version 16? I have High Sierra 10.13.6
iMac 27″, macOS 10.13
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To upgrade to the current version of Safari you need to upgrade macOS on your iMac.
The model year of an iMac is available at Apple menu > About This Mac.
A late 2009 through mid 2011 iMac can be upgraded to High Sierra 10.13.6 but no later version. See: How to download macOS - Apple Support
A late 2012 through late 2013 iMac can be upgraded to Catalina 10.15.7 but no later. See: How to download macOS - Apple Support
A mid 2014 and late 2014 iMac can be upgraded to the latest version of Big Sur macOS 11 but no later. See: How to download macOS - Apple Support
A late 2015 iMac can be upgraded to the latest version of Monterey macOS 12. See:How to download macOS - Apple Support
A 2017 or later iMac can be upgraded to the current version of Ventura macOS 13. See: How to upgrade to macOS Ventura - Apple Support
If you cannot upgrade your iMac, you may want to consider, for security reasons, using a 3rd party browser that supports running its current version on your Mac. One option is Chrome: https://www.google.com/chrome/