Can I/Should I update Safari?

[Raven]

I have NEVER updated Safari. Didn't think about it until I got a few "browser out of date" messages. Then I would go to my FF browser which updates automatically. Today I read on TS there is a Safari update. 

I need to stay at OS10.14.3 to be able to use my Adobe CS6 apps for a few more years.  That OS came with Safari 12.0.3.

Can I load the latest Safari version(15?) with my existing, older OS or will there be issues?  Please advise. Thank you!

[Xairbusdriver]

Generally, Software Update will not allow you to install an Apple app that won’t run on your installed OS. You can also visit Apple’s site and check for System “requirements”.