Upgrade from ps4 version to ps5 version

Hello there,

I was wondering if there is a upgrade from ps4 to ps5 version in planing.
I ask this cause its apperantly not possible for my friend and me to play together.
Maybe its a problem cause its the ps4 version?

PS4 and PS5 play the same version: the PS4 version.
And this is compatible to each other.
So you probably have other problems. Connectivity, firewall settings, nat-type… Sony related problems, not GZ related problems.