diff --git a/stack.yaml b/stack.yaml
index 7c62ac7a..b7e1438e 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -11,5 +11,7 @@ packages:
 - servant-lucid/
 - servant-mock/
 - servant-server/
-extra-deps: []
+extra-deps:
+- engine-io-wai-1.0.2
+- attoparsec-0.13.0.1
 resolver: nightly-2015-07-24