diff --git a/build-constraints.yaml b/build-constraints.yaml
index ad0c5776..9e2fbb4f 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1981,6 +1981,7 @@ packages:
 
         # https://github.com/fpco/stackage/issues/1211
         - aeson < 0.10
+        - hpack < 0.9.1
 
         # https://github.com/fpco/stackage/issues/1215
         - argon < 0.4.1.0