diff --git a/build-constraints.yaml b/build-constraints.yaml
index d5614074..57d83e47 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2530,7 +2530,7 @@ packages:
         - extractable-singleton
         - follow-file < 0 # 0.0.3 compile fail https://github.com/athanclark/follow-file/issues/1
         - HSet
-        - markup
+        - markup < 0 # 4.2.0 compile fail https://github.com/athanclark/markup/issues/7
         - monad-control-aligned
         - monadoid
         - n-tuple