diff --git a/spack.yaml b/spack.yaml
index 15069e099a634225564c63e09bdb5264150c805f..a4fb019c1d482ad820fd13bc0b9b1e9e76a07eae 100644
--- a/spack.yaml
+++ b/spack.yaml
@@ -30,8 +30,8 @@ spack:
     - py-pyaescrypt
     - py-formencode
     - tvb-framework ^binutils+ld+gold
-    - pynn-brainscales@3.0-a1 ^log4cxx@0.10.0 ^googletest@1.11.0:+gmock
-    - hxtorch@3.0-a1 ^log4cxx@0.10.0 ^googletest@1.11.0:+gmock
+    - pynn-brainscales@4.0-a1 ^log4cxx@0.10.0 ^googletest@1.11.0:+gmock
+    - hxtorch@4.0-a1 ^log4cxx@0.10.0 ^googletest@1.11.0:+gmock
     - py-neo
     - py-hdmf
     - py-pynwb