diff --git a/dns/42.10.in-addr.arpa b/dns/42.10.in-addr.arpa
index 227ca48..bbe94fe 100644
--- a/dns/42.10.in-addr.arpa
+++ b/dns/42.10.in-addr.arpa
@@ -1,5 +1,5 @@
 @     IN SOA   higgsboson.tk. hostmaster (
-                        310       ; serial
+                        311       ; serial
                         1H        ; refresh
                         4H        ; retry
                         3W        ; expire
diff --git a/dns/vpn.zone b/dns/vpn.zone
index cd128fc..cd921e2 100644
--- a/dns/vpn.zone
+++ b/dns/vpn.zone
@@ -1,5 +1,5 @@
 @     IN SOA   higgsboson.tk. hostmaster (
-                        306       ; serial
+                        307       ; serial
                         1H        ; refresh
                         4H        ; retry
                         3W        ; expire