Ah, thanks, I didn't know there was more in the menu of the Host Tools section of the Dashboard. When I run the server audit, everything comes up as OK, except the UNA version which comes up as WARNING and tells me I need to update.

It showed that cron had never run, so I checked my server itself and I had forgotten to set up the cron job when installing. I set up the suggested cron now, and it worked! My site is updating perfectly now.

Thank you so much! It's been about a decade since I've worked with open source software so I'm pretty rusty. I appreciate the help!

[edit: the option for server audit becomes much more obvious once I got updated into the 14.x releases!]