diff --git a/build-constraints.yaml b/build-constraints.yaml
index f0016e8b..39689e73 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1100,6 +1100,11 @@ packages:
         - clustering
         - matrices
 
+    "Michel Boucey <michel.boucey@gmail.com> @MichelBoucey":
+        - IPv6Addr
+        - ip6addr
+        - cayley-client
+
     "Stackage upper bounds":
         # https://github.com/fpco/stackage/issues/537
         - zlib < 0.6