diff --git a/build-constraints.yaml b/build-constraints.yaml
index f7d2643a..3184de29 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3743,7 +3743,7 @@ packages:
         - HDBC-mysql
 
     "Tony Morris <haskell@tmorris.net> @tonymorris":
-        - validation
+        - validation < 1.1.4 # https://github.com/commercialhaskell/stackage/issues/7965
 
     "Tony Day <tonyday567@gmail.com> @tonyday567":
         - box