diff --git a/build-constraints.yaml b/build-constraints.yaml
index 350b6331..c245ee53 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1654,6 +1654,7 @@ packages:
 
         # https://github.com/fpco/stackage/issues/946
         - cereal < 0.5
+        - messagepack < 0.5.0
         - messagepack-rpc < 0.5.1