diff --git a/container_definitions/amd64/multiscale-run/spack.yaml b/container_definitions/amd64/multiscale-run/spack.yaml
index 1e52b19..9068147 100644
--- a/container_definitions/amd64/multiscale-run/spack.yaml
+++ b/container_definitions/amd64/multiscale-run/spack.yaml
@@ -5,6 +5,7 @@ spack:
     petsc:
       require:
         - ~hypre~superlu-dist  # Hypre fails to compile, SuperLU the same
+        - "@3.20"  # 3.22 seems to not be OK with our blas
     py-pandas:
       require: ~performance  # Otherwise pulls in numba that requires outdated LLVM
     py-numpy-quaternion: