diff --git a/spack-environment/dev/spack.yaml b/spack-environment/dev/spack.yaml
index 8b1125400eebba63c46cf13782c9cad4172204ec..434c5e1fafa7755b222b979a9098d35c7b612b52 100644
--- a/spack-environment/dev/spack.yaml
+++ b/spack-environment/dev/spack.yaml
@@ -67,6 +67,7 @@ spack:
   - py-mplhep
   - py-htgettoken
   - py-numpy
+  - py-onnx
   - py-pandas
   - py-pip
   - py-pre-commit
diff --git a/spack-environment/packages.yaml b/spack-environment/packages.yaml
index dda0113580f9c13a1116a8d6cc17438836ae734d..1630fc64d680bf40a78f20fc8baf15428f5fda28 100644
--- a/spack-environment/packages.yaml
+++ b/spack-environment/packages.yaml
@@ -276,6 +276,9 @@ packages:
   py-numpy:
     require:
     - '@1.26.1'
+  py-onnx:
+    require:
+    - '@1.13.1'
   py-pandas:
     require:
     - '@1.5.3'