diff --git a/stack.yaml b/stack.yaml
index e0a98888..9744f955 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,4 +1,4 @@
-resolver: lts-2.9
+resolver: lts-2.17
 packages:
   - ./yesod-core
   - ./yesod-static