diff --git a/projects/jupyter.org/package.yml b/projects/jupyter.org/package.yml
index b83f380c..b19a37c4 100644
--- a/projects/jupyter.org/package.yml
+++ b/projects/jupyter.org/package.yml
@@ -34,6 +34,7 @@ provides:
 
 dependencies:
   python.org: '>=3.7<3.12'
+  gnu.org/which: 2
 
 build:
   script: