diff --git a/machines/core-services-01/subZone.nix b/machines/core-services-01/subZone.nix
index 2533dd8..8937940 100644
--- a/machines/core-services-01/subZone.nix
+++ b/machines/core-services-01/subZone.nix
@@ -15,7 +15,7 @@ with my.ipv6; # contains { standard, acme }
   SOA = {
     nameServer = "ns1.${my.subZone}.";
     adminEmail = my.email;
-    serial = 2021072400; # Y M D Version
+    serial = 2021111100; # Y M D Version
   };
 
   NS = [