diff --git a/compiler.mac64.osx.gfo b/compiler.mac64.osx.gfo
index 590e10e..8adfb9a 100644
--- a/compiler.mac64.osx.gfo
+++ b/compiler.mac64.osx.gfo
@@ -3,7 +3,7 @@
 # Fortran compilation and loading
 #
 
-FORTRAN='gfortran-12'
+FORTRAN='gfortran-13'
 BASIC='-c -fPIC -fno-second-underscore -flat_namespace -cpp'
 MBASIC='-fPIC -fno-second-underscore -flat_namespace -cpp'
 LIBCMD=''