Raspberry Pi WordPress install login problems

Hi!

I recently had some trouble with my Raspberry Pi, where I host a few different web sites. Long story short, I discovered that my Pi had changed network IP addresses. Now I have a new situation.

It seems that all of my websites, except one, function perfectly (I can login, update plugins, etc.) However, one website’s login brings me to a plain text login screen and fails to log me in. I can see in the address bar that it’s aiming for the old IP address and not the new one.

How do I tell this specific WordPress installation to aim its login towards that new IP address?

Any advice is appreciated!