diff --git a/seichi-onp-k8s/manifests/seichi-kubernetes/apps/cluster-wide-apps/app-of-other-apps/cert-manager.yaml b/seichi-onp-k8s/manifests/seichi-kubernetes/apps/cluster-wide-apps/app-of-other-apps/cert-manager.yaml
index e6b9501a8..d942e1f64 100644
--- a/seichi-onp-k8s/manifests/seichi-kubernetes/apps/cluster-wide-apps/app-of-other-apps/cert-manager.yaml
+++ b/seichi-onp-k8s/manifests/seichi-kubernetes/apps/cluster-wide-apps/app-of-other-apps/cert-manager.yaml
@@ -8,7 +8,7 @@ spec:
   source:
     chart: cert-manager
     repoURL: https://charts.jetstack.io
-    targetRevision: v1.15.3
+    targetRevision: v1.16.0
     helm:
       releaseName: cert-manager
       values: |