I updated the version on my computer, But Safari did not update

My new Quickbooks software is requesting that I need to update the Safari version on my computer, I uugraded the MacOsto the Big Sur from my previous version the Mavericks , I checked and the the current version of the Safari on my computer is a 14.0.2. how can I update it if its telling me that my computer is up to date.

please help..