diff --git a/spack.yaml b/spack.yaml
index 33b81372ef4fa93867a58b12ee9982c97ef864cb..cda42edc020b424d4c41b7e25df3e1703d6eae2c 100644
--- a/spack.yaml
+++ b/spack.yaml
@@ -8,9 +8,10 @@ spack:
     # General
     - py-pip %gcc@10.3.0
     # EBRAINS simulators
-    - nest@2.20.0 +python +gsl +mpi %gcc@10.3.0
+    #- nest@2.20.0 +python +gsl +mpi %gcc@10.3.0
+    - nest@3.0 +python +gsl +mpi %gcc@10.3.0
     - arbor +mpi %gcc@10.3.0
     - neuron +mpi %gcc@10.3.0
     - py-pynn %gcc@10.3.0 
     # BrainScaleS (plus some constraining)
-    - visionary-dls-core ^py-setuptools-scm+toml ^python@3.8.0:3.8.999 ^binutils+ld ^py-astroid@2.5.6:2.6.999 ^py-scipy@:1.6.999 %gcc@10.3.0
+    #- visionary-dls-core ^py-setuptools-scm+toml ^python@3.8.0:3.8.999 ^binutils+ld ^py-astroid@2.5.6:2.6.999 ^py-scipy@:1.6.999 %gcc@10.3.0