diff --git a/clusters/cherry/apps/ingress-nginx.yaml b/clusters/cherry/apps/ingress-nginx.yaml
index 2ad7f06..58679d7 100644
--- a/clusters/cherry/apps/ingress-nginx.yaml
+++ b/clusters/cherry/apps/ingress-nginx.yaml
@@ -22,19 +22,19 @@ spec:
       releaseName: ingress-nginx
       valuesObject:
         ingressClassResource:
-          default: true
+          default: "true"
         # TODO: enable proxy protocol
         controller:
-          kind: DaemonSet
+          kind: "DaemonSet"
           updateStrategy:
-            type: RollingUpdate
+            type: "RollingUpdate"
             rollingUpdate:
-              maxUnavailable: 1
+              maxUnavailable: "1"
           service:
             # TODO: use Service .spec.type: NodePort
-            type: ClusterIP
+            type: "ClusterIP"
           hostPort:
-            enabled: true
+            enabled: "true"
           config:
             allow-snippet-annotations: "true"
             generate-request-id: "true"
diff --git a/clusters/lychee/ingress-nginx.yaml b/clusters/lychee/ingress-nginx.yaml
index 51d46fd..5b5e921 100644
--- a/clusters/lychee/ingress-nginx.yaml
+++ b/clusters/lychee/ingress-nginx.yaml
@@ -24,18 +24,18 @@ spec:
       releaseName: ingress-nginx
       valuesObject:
         ingressClassResource:
-          default: true
+          default: "true"
         controller:
-          kind: DaemonSet
+          kind: "DaemonSet"
           updateStrategy:
-            type: RollingUpdate
+            type: "RollingUpdate"
             rollingUpdate:
-              maxUnavailable: 1
+              maxUnavailable: "1"
           service:
-            type: NodePort
+            type: "NodePort"
             nodePorts:
-              http: 32080
-              https: 32443
+              http: "32080"
+              https: "32443"
           config:
             allow-snippet-annotations: "true"
             generate-request-id: "true"