diff --git a/build-constraints.yaml b/build-constraints.yaml
index 929c7cec..f7cf8ddd 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -8177,6 +8177,9 @@ packages:
 
         # https://github.com/commercialhaskell/stackage/issues/7160
         - some < 1.0.6
+
+        # https://github.com/commercialhaskell/stackage/issues/7161
+        - htoml-megaparsec < 2.1.0.5
     # end of Stackage upper bounds
 # end of packages