diff --git a/spack.yaml b/spack.yaml
index ac8b6f4387fdcc926319d1984382ef33276fd10e..01be085cd7e01c5538b80597fdbfb4542c1db78d 100644
--- a/spack.yaml
+++ b/spack.yaml
@@ -30,7 +30,6 @@ spack:
     - py-pyaescrypt
     - py-formencode
     - tvb-framework ^binutils+ld+gold
-    - py-pybind11@2.10.1:
     - 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