Update browser -safari

Safari is updated in software update per your operating system. if your operating system is completely up to date, the only way to update safari is to upgrade your operating system. You maybe able to upgrade, depend on what computer you are using.How to get old versions of macOS - Apple Support You can find out what operating systems your computer can run.

Finally, sometimes updating Safari will resolve a problem of accessing certain web sites, but sometimes it does not. If that is the case, the easy solution is to use another browser for those sites such as Firefox. It should work.