diff --git a/configs/sst_cs_apps-python-data-formats-c9s.yaml b/configs/sst_cs_apps-python-data-formats-c9s.yaml
index 62d216888..415dc1acd 100644
--- a/configs/sst_cs_apps-python-data-formats-c9s.yaml
+++ b/configs/sst_cs_apps-python-data-formats-c9s.yaml
@@ -9,6 +9,7 @@ data:
   - python3-lxml
   - python3-pyyaml
   - python3-toml
+  - python3-tomli
 
   labels:
   - c9s