diff --git a/build-constraints.yaml b/build-constraints.yaml
index 46151488..277c98ff 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -8542,6 +8542,9 @@ packages:
         - tls < 2
         - tls-session-manager < 0.0.5
 
+        # https://github.com/commercialhaskell/stackage/issues/7321
+        - HPDF < 1.7
+
     # end of Stackage upper bounds
 # end of packages