diff --git a/build-constraints.yaml b/build-constraints.yaml
index 26e3c5bc..b328d4eb 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3398,7 +3398,7 @@ packages:
         - socket-activation < 0 # via network-3.1.1.0
 
     "aiya000 <aiya000.develop@gmail.com> @aiya000":
-        - character-cases
+        - character-cases < 0.1.0.5 # https://github.com/commercialhaskell/stackage/issues/5404
         - throwable-exceptions
 
     "Mitsutoshi Aoe <maoe@foldr.in> @maoe":