diff --git a/spack.yaml b/spack.yaml
index 2d6de0b3b15ea1673ed421bc76f97b8e3608dd78..473a9dc92f245741b9d7ab9ce0e50c71e4dd2b36 100644
--- a/spack.yaml
+++ b/spack.yaml
@@ -34,6 +34,7 @@ spack:
     - mesa@22.1.2 +glx -llvm +opengl +opengles +osmesa
     - nlohmann-json@3.11.2
     - npsim@1.1.0 +geocad +http
+    - onnx@1.12.0
     - opencascade@7.6.3
     - osg-ca-certs@1.109.igtf.1.117
     - phonebook-cli@1.0.0