diff --git a/spack.yaml b/spack.yaml
index 41d50bbfc460c1ce15355e925d93855cad756a9b..01be085cd7e01c5538b80597fdbfb4542c1db78d 100644
--- a/spack.yaml
+++ b/spack.yaml
@@ -20,7 +20,7 @@ spack:
     #- py-version-query
     # EBRAINS simulators
     - nest@3.3 +python +gsl +mpi
-    - arbor +python +mpi ^python@3.7:
+    - arbor +python +mpi
     - neuron +mpi
     - py-pynn@0.10.1 +mpi
     - py-brian2