diff --git a/stack-lts-9.21.yaml b/stack-lts-9.21.yaml
index 4832977..88e8ecd 100644
--- a/stack-lts-9.21.yaml
+++ b/stack-lts-9.21.yaml
@@ -2,3 +2,5 @@
 resolver: lts-9.21
 extra-deps:
   - load-env-0.1.2
+  - yesod-auth-1.6.1
+  - yesod-core-1.6.1