diff --git a/stack.yaml b/stack.yaml
index bf1585e..85060e5 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -7,4 +7,4 @@ packages:
 - wai-middleware-prometheus
 extra-deps:
 - unix-memory-0.1.2
-resolver: lts-11.2
+resolver: lts-12.14