diff --git a/spack.yaml b/spack.yaml
index e59402550933e193ec9c0fa0fdefe620b0fcf605..a337fce2dd1580176bc62b68eb321fb0b905aed5 100644
--- a/spack.yaml
+++ b/spack.yaml
@@ -13,10 +13,10 @@ spack:
 #    - 'gcc@10.3.0 os=centos7'
   - pkgs:
     - py-numpy ^python@3.8.10 
-    - py-scipy ^python@3.8.10 
-    - py-pip ^python@3.8.10 
+    #- py-scipy ^python@3.8.10 
+    #- py-pip ^python@3.8.10 
     #- nest +gsl +python ^python@3.8.10 %gcc@9.3.1
-    - arbor ^python@3.8.10
+    #- arbor ^python@3.8.10
 
   - compilers:
 #    - '%gcc@4.8.5'