diff --git a/ivpm.yaml b/ivpm.yaml
index 2f262b2..d9da388 100644
--- a/ivpm.yaml
+++ b/ivpm.yaml
@@ -6,7 +6,9 @@ package:
 
   dep-sets:
   - name: default
-    deps: []
+    deps: 
+    - name: ply
+      src: pypi
 
   - name: default-dev
     deps: