Old site running 1.5.5 - moving hosts

Hi All

Merry Christmas.

I'm currently in the process of moving websites to another host, and one of those sites is an old Perch install, v 1.5.5.

What is the best approach here? Should I upgrade it to the latest version and then move it? Or move it as it is?

If I upgrade it, I am likely to run into any issues being such an old version?

Many thanks in advance. Juan