GCC 13.1 was released on April 26th. The Release Notes mention Fortran just twice:
OpenMP
- OpenMP 5.0: Fortran now supports some non-rectangular loop nests; for C/C++, the support was added in GCC 11
Fortran
- Finalization is now fully supported.
There are also a few dozen bugs claimed to be fixed
The only environment (from quite a few) I use that offers gcc-13.1 as of today is Homebrew.