diff --git a/seichi-onp-k8s/manifests/seichi-kubernetes/apps/cluster-wide-apps/app-of-other-apps/prometheus-operator.yaml b/seichi-onp-k8s/manifests/seichi-kubernetes/apps/cluster-wide-apps/app-of-other-apps/prometheus-operator.yaml
index aa860f8a0..27a53a5b6 100644
--- a/seichi-onp-k8s/manifests/seichi-kubernetes/apps/cluster-wide-apps/app-of-other-apps/prometheus-operator.yaml
+++ b/seichi-onp-k8s/manifests/seichi-kubernetes/apps/cluster-wide-apps/app-of-other-apps/prometheus-operator.yaml
@@ -35,7 +35,7 @@ spec:
   source:
     chart: kube-prometheus-stack
     repoURL: https://prometheus-community.github.io/helm-charts
-    targetRevision: 51.0.3
+    targetRevision: 51.1.1
     helm:
       releaseName: prometheus
       skipCrds: true