If you do not know which OS/Architecture you are using, please run the following:
This command will give you output like:
or similar. The results would show you are using RHEL 8.2, 7.9, CentOS 7.8, CentOS 6.10 or Fedora 32, respectively.
This command will give you an output like
So, if the first output is Fedora 32 and the second one is x86_64, go to Packages page, and find the repository RPMs in the PostgreSQL version that you are looking for.