Often we need a more modern compiler than is included in Red Hat / CentOS for HPC systems. Once an admin sets up GCC Toolset they can be loaded by any user thereafter.
To install and use a recent GFortran version, have the system admin do like:
yum install gcc-toolset-11-gcc-gfortran
Thereafter, users without sudo use the new Gfortran version for that Terminal session only by:
scl enable gcc-toolset-11 bash
Prior to CentOS / RHEL 8, this was known as Developer Toolset devtoolset.