Also for corporate users this is a pain as you have to update Safari via Software Update unlike browsers like Chrome which automatically update.
Safari:
https://support.apple.com/en-us/HT213930
MacOS:
https://support.apple.com/en-us/HT213906
https://support.apple.com/en-us/HT213915
https://support.apple.com/en-us/HT213914