diff --git a/build-constraints.yaml b/build-constraints.yaml
index fd77671c..9108d506 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -657,7 +657,7 @@ packages:
         - monad-recorder
         - packcheck
         - streamly < 0.8.1 # https://github.com/commercialhaskell/stackage/issues/6335
-        - unicode-transforms
+        - unicode-transforms < 0.4 # https://github.com/commercialhaskell/stackage/issues/6337
         - xls
 
     "Pranay Sashank <pranaysashank@gmail.com> @pranaysashank":