diff --git a/spack.yaml b/spack.yaml
index 3edc83b..37c0b99 100644
--- a/spack.yaml
+++ b/spack.yaml
@@ -18,14 +18,16 @@ spack:
       - openmpi
       - perl
       - python@3.11
-    - - '%gcc@12'
+    - - '%gcc@11'
+      - '%gcc@12'
       - '%gcc@13'
       - '%clang@15'
   - matrix:
     - - fftw +mpi +openmp ^mpich
       - fftw +mpi +openmp ^openmpi
       - openblas threads=openmp +ilp64
-    - - '%gcc@12'
+    - - '%gcc@11'
+      - '%gcc@12'
       - '%gcc@13'
   # clang does not have openmp libs in GitHub Actions?
   - matrix: