diff --git a/apps/knotdns/Chart.yaml b/apps/knotdns/Chart.yaml
index c1d5334..907aefa 100644
--- a/apps/knotdns/Chart.yaml
+++ b/apps/knotdns/Chart.yaml
@@ -3,4 +3,4 @@ name: knotdns
 description: Authoritative DNS server
 
 version: 0.1.1
-appVersion: 3.0
+appVersion: "3.0"
diff --git a/apps/knotdns/templates/deployment.yaml b/apps/knotdns/templates/deployment.yaml
index 613b0a2..2c20348 100644
--- a/apps/knotdns/templates/deployment.yaml
+++ b/apps/knotdns/templates/deployment.yaml
@@ -19,7 +19,7 @@ spec:
     spec:
       containers:
         - name: knot
-          image: cznic/knot:{{ .Chart.AppVersion }}
+          image: "cznic/knot:{{ .Chart.AppVersion }}"
           ports:
             - name: udp-53
               containerPort: 53