diff --git a/stack.lts9.yaml b/stack.lts9.yaml
index eff0415cb..403b5543b 100644
--- a/stack.lts9.yaml
+++ b/stack.lts9.yaml
@@ -27,5 +27,4 @@ extra-deps:
 - pandoc-citeproc-0.14.3
 - tagsoup-0.14.6
 - pandoc-types-1.17.4.2
-- haddock-library-1.4.5
 resolver: lts-9.14