diff --git a/stack.yaml b/stack.yaml
index 8c4a91d..b7e8787 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -2,4 +2,4 @@ extra-package-dbs: []
 packages:
 - '.'
 extra-deps: []
-resolver: lts-8.9
+resolver: lts-8.12