How to I updated my Safari browser?
How do I update my browser?
iMac 21.5″, macOS 10.13
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You need to update your OS version to update the browser.
Check the computer requirements shown in each link to see if your computer is capable of running that OS version.
macOS Big Sur is compatible with these computers
How to upgrade to macOS Mojave - Apple Support
Check to make sure your applications are compatible. 6.
Also check to make sure there is a compatible driver for your printer.
Do a backup before installing, preferable 2 backups on 2 different drives.