diff --git a/build-constraints.yaml b/build-constraints.yaml
index 3b45ba24..1cb4b757 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4995,6 +4995,14 @@ packages:
     "Michael Dressel <michael.dressel@kloenplatz.de> @mdrslmr":
         - MultipletCombiner
 
+    "Kazu Yamamoto <kazu@iij.ad.jp> @kazu-yamamoto":
+        - crypton
+        - crypton-connection
+        - crypton-x509
+        - crypton-x509-store
+        - crypton-x509-system
+        - crypton-x509-validation
+
     "Grandfathered dependencies":
         - BiobaseNewick
         - Boolean