diff --git a/stack.yaml b/stack.yaml
index 29b90e10..7266fb3c 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -21,3 +21,4 @@ extra-deps:
 - yaml-0.8.17
 - nonce-1.0.2
 - persistent-2.5
+- cookie-0.4.2