diff --git a/ops/nixos/lib/coredns/zones/db.as205479.net b/ops/nixos/lib/coredns/zones/db.as205479.net
index 2cd77416af..07e5bfc576 100644
--- a/ops/nixos/lib/coredns/zones/db.as205479.net
+++ b/ops/nixos/lib/coredns/zones/db.as205479.net
@@ -3,7 +3,7 @@
 ; SPDX-License-Identifier: Apache-2.0
 
 ;              MNAME                        RNAME                  SERIAL REFRESH RETRY EXPIRE TTL
-@ 600 IN SOA   frantech-lux01.as205479.net. hostmaster.lukegb.com. 3      600     450   3600   300
+@ 600 IN SOA   frantech-lux01.as205479.net. hostmaster.lukegb.com. 4      600     450   3600   300
 
 ; NB: this are also glue records in Google Domains.
 $INCLUDE tmpl.ns