diff --git a/build-constraints.yaml b/build-constraints.yaml
index 044de014..3cdcacf5 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1759,6 +1759,7 @@ packages:
         - derive < 2.5.23
         - hlint < 1.9.23
         - stylish-haskell < 0.5.14.4
+        - fay < 0.23.1.9
 
         # https://github.com/fpco/stackage/issues/992
         - safecopy < 0.9