diff --git a/build-constraints.yaml b/build-constraints.yaml
index 582c97d2..6f685b66 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1093,6 +1093,10 @@ packages:
         - bytestring-read
         - memcached-binary
 
+    "Kai Zhang <kai@kzhang.org> @kaizhang":
+        - clustering
+        - matrices
+
     "Stackage upper bounds":
         # https://github.com/fpco/stackage/issues/537
         - zlib < 0.6