diff --git a/stack.yaml b/stack.yaml
index bddb744d4..ed354819d 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -7,6 +7,5 @@ flags:
     network-uri: true
 packages:
 - '.'
-- 'https://hackage.haskell.org/package/pandoc-types-1.12.4.6/pandoc-types-1.12.4.6.tar.gz'
 extra-deps: []
-resolver: lts-3.4
+resolver: lts-3.9