Update Safari with old MacOS
How do we update our Safari when our version of MacOS is an older computer?
iMac 27″, macOS 10.13
Question marked as
There is no option to update Safari beyond Safari version 13.12. on your iMac that is running macOS 10.13
You would need to upgrade the macOS.
The model year of an iMac is available at Apple menu > About This Mac.
An early 2009 iMac can be upgraded to El Capitan 10.11.6 but no later version. See: How to download macOS - Apple Support
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
Be aware that if you upgrade to Catalina 10.15 or later you will also need to update any non-Apple 32-bit apps. See: https://www.macworld.com/article/232735/how-to-check-if-mac-software-is-32-or-64-bit.html
If you cannot or don't want to upgrade macOS, you should, for security reasons, use a 3rd party internet browser that support running a current version on your macOS. Two examples are Chrome https://www.google.com/chrome/ and Firefox.