diff --git a/charts/bind9/Chart.yaml b/charts/bind9/Chart.yaml
index c4e6213..1dcd5c2 100644
--- a/charts/bind9/Chart.yaml
+++ b/charts/bind9/Chart.yaml
@@ -2,5 +2,5 @@ apiVersion: v2
 name: bind9
 description: bind9 primary-secondary (master-slave) setup
 type: application
-version: 0.1.5
+version: 0.1.6
 appVersion: "9.18"
diff --git a/charts/bind9/values.yaml b/charts/bind9/values.yaml
index 9d5fcb7..a9fa099 100644
--- a/charts/bind9/values.yaml
+++ b/charts/bind9/values.yaml
@@ -2,10 +2,10 @@
 domain: ""
 tsigKey: ""
 zone:
-  refresh: 10
-  retry: 10
-  expire: 1209600
-  negativeCacheTtl: 300
+  refresh: "10"
+  retry: "10"
+  expire: "1209600"
+  negativeCacheTtl: "300"
   # passed through tpl
   dnsRecords: []