diff --git a/spack.yaml b/spack.yaml
index 59270ae2e7a73c1470fa2c702d08d11847dbd460..6f22736623fcaff27f40367b43460cf56c03b6ad 100644
--- a/spack.yaml
+++ b/spack.yaml
@@ -12,10 +12,10 @@ spack:
     - biobb-model@4.0.0
     - biobb-structure-checking@3.12.1
     - biobb-structure-utils@4.0.0
-    - hxtorch@8.0-a5
+    - hxtorch@9.0-a4
     - nest@3.8 +sonata
     - neuron@8.2.3 +mpi
-    - jaxsnn@8.0-a5
+    - jaxsnn@9.0-a4
     - py-bluepyefe@2.2.18
     - py-bluepymm@0.7.65
     - py-bluepyopt@1.13.86
@@ -55,14 +55,14 @@ spack:
     - py-tvb-storage@2.9
     - py-tvb-widgets@2.1.0
     - py-viziphant@0.4.0
-    - pynn-brainscales@8.0-a5
+    - pynn-brainscales@9.0-a4
     - r-rgsl@0.1.1
     - r-sbtabvfgen@0.1
     - r-uqsa@2.2
     - sda@7.3.3d
     # Workflows (meta-packages)
     - wf-biobb
-    - wf-brainscales2-demos@8.0-a5
+    - wf-brainscales2-demos@9.0-a4
     - wf-protein-association-rates@0.1
     - wf-multi-area-model@1.2.0
     - wf-uq-akar4@0.1