Can't seem to update Flip 6 phone

Hello strangers of Reddit. I recently purchased a barely used Flip 6. It seems to be in perfect condition and I have spent the last few days getting it all set up just to my liking. The one think I've hit a wall with is getting it to update. It is currently at Android version 14 and One UI version 6.1.1. Any words of wisdom for me? Oh yeah, this was unlocked phone and I am with Verizon.