What is the most recent version for my Mac computer
Safari What is the most recent version of safari?
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The current version of Safari is 14.1.2
Whether that would run on your computer depends on your computer model (e.g., iMac, MacBook Pro, etc) and model year. Both of those are available at Apple menu > About This Mac.
If you reply with that information, someone here may be able to give you more information.