diff --git a/spack-environment/dev/spack.yaml b/spack-environment/dev/spack.yaml
index 7ec9666618a095df0ca0d0899e28b36b966e3940..2ad78ee7a2aad8c005569be63f368807e3eb3e46 100644
--- a/spack-environment/dev/spack.yaml
+++ b/spack-environment/dev/spack.yaml
@@ -68,6 +68,7 @@ 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 c700a560ea427459dbf93f7cafaac0ae27aac82d..3b557fdcbd6a616ed900987274522823f8d824a6 100644
--- a/spack-environment/packages.yaml
+++ b/spack-environment/packages.yaml
@@ -282,6 +282,9 @@ packages:
   py-numpy:
     require:
     - '@1.26.1'
+  py-onnx:
+    require:
+    - '@1.13.1'
   py-pandas:
     require:
     - '@1.5.3'