diff --git a/spack.yaml b/spack.yaml
index f2b9e51ed2daa98c9b43d364a2332fc4fc919d66..4fd7d59500b01b29c8eca17fc2429dd6db1f70b7 100644
--- a/spack.yaml
+++ b/spack.yaml
@@ -21,7 +21,7 @@ spack:
     - nest@3.3 +python +gsl +mpi
     - arbor +python +mpi ^python@3:3.9
     - neuron +mpi
-    - py-pynn@0.9.6
+    # - py-pynn@0.9.6
     - py-pynn@0.10.0 +mpi
     - tvb-data
     - tvb-library ^py-numba@0.54.0 ^binutils+ld+gold