diff --git a/stack.yaml b/stack.yaml
index 3c1e5bb0..ec7cb30b 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,4 +1,4 @@
-resolver: lts-3.7
+resolver: lts-5.6
 packages:
   - ./yesod-core
   - ./yesod-static