diff --git a/build-constraints.yaml b/build-constraints.yaml
index 7fb7ec63..2f969714 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -8500,7 +8500,7 @@ packages:
         - file-embed-lzma < 0.1
 
         # https://github.com/commercialhaskell/stackage/issues/7473
-        - unicode-data < 0.6
+        - unicode-data < 0.5
     # end of Stackage upper bounds
 # end of packages