diff --git a/spack-environment/packages.yaml b/spack-environment/packages.yaml
index d2afb467..f1ca5e47 100644
--- a/spack-environment/packages.yaml
+++ b/spack-environment/packages.yaml
@@ -234,7 +234,7 @@ packages:
     - +fastjet +root
   python:
     require:
-    - '@3.11.6'
+    - '@3.10.13'
   py-awkward:
     require:
     - '@2.1.1'