diff --git a/example.spec b/example.spec
index 43a14313..6c91d22c 100644
--- a/example.spec
+++ b/example.spec
@@ -27,7 +27,7 @@
 	 (run
 	  (network host)
 	  (cache (opam-archives (target /home/opam/.opam/download-cache)))
-	  (shell "opam depext -y obuilder"))
+	  (shell "opam depext -yu obuilder"))
 	 ; Install OCaml dependencies
 	 (run
 	  (network host)