diff --git a/spack.yaml b/spack.yaml
index 4f821a20dfdb3e3822e073e855f802ce017b91ad..9f97800e61a36d9acd4346f82952e6f018df7d86 100644
--- a/spack.yaml
+++ b/spack.yaml
@@ -30,8 +30,8 @@ spack:
     - py-pyaescrypt
     - py-formencode
     - tvb-framework ^binutils+ld+gold
-    - pynn-brainscales@4.0-a2 ^log4cxx@0.10.0 ^googletest@1.11.0:+gmock
-    - hxtorch@4.0-a2 ^log4cxx@0.10.0 ^googletest@1.11.0:+gmock
+    - pynn-brainscales@4.0-a3 ^log4cxx@0.10.0 ^googletest@1.11.0:+gmock
+    - hxtorch@4.0-a3 ^log4cxx@0.10.0 ^googletest@1.11.0:+gmock
     - py-neo
     - py-hdmf
     - py-pynwb