diff --git a/.github/workflows/pluto.yaml b/.github/workflows/pluto.yaml
index 58108e6c6..4a2d8b112 100644
--- a/.github/workflows/pluto.yaml
+++ b/.github/workflows/pluto.yaml
@@ -18,8 +18,8 @@ jobs:
 
       - name: Use pluto
         run: |
-          pluto detect-files -d seichi-onp-k8s/manifests/seichi-kubernetes/apps --target-versions k8s=v1.28.4
+          pluto detect-files -d seichi-onp-k8s/manifests/seichi-kubernetes/apps --target-versions k8s=v1.28.5
 
       - name: Use pluto
         run: |
-          pluto detect-files -d seichi-onp-k8s/manifests/seichi-kubernetes/app-templates --target-versions k8s=v1.28.4
+          pluto detect-files -d seichi-onp-k8s/manifests/seichi-kubernetes/app-templates --target-versions k8s=v1.28.5
diff --git a/seichi-onp-k8s/cluster-boot-up/README.md b/seichi-onp-k8s/cluster-boot-up/README.md
index 16d6197e4..a92344344 100644
--- a/seichi-onp-k8s/cluster-boot-up/README.md
+++ b/seichi-onp-k8s/cluster-boot-up/README.md
@@ -64,7 +64,7 @@ KubernetesノードのVMは cloudinit イメージで作成されています。
 2022/05/23現在、クラスタは (3 control plane nodes + 3 worker nodes) の構成で[作成されています](https://github.com/GiganticMinecraft/seichi_infra/blob/91999d509e52905eaff16fc8928fbe5316f1eaeb/seichi-onp-k8s/cluster-boot-up/scripts/proxmox-host-terminal/deploy-vm.sh#L15-L20)。
 
 クラスタの作成は以下のツール群で行っています。
-  - kubeadm, kubectl, kubelet v1.28.4
+  - kubeadm, kubectl, kubelet v1.28.5
 
 CNI には Cilium を利用しています。
 
diff --git a/seichi-onp-k8s/cluster-boot-up/scripts/nodes/k8s-node-setup.sh b/seichi-onp-k8s/cluster-boot-up/scripts/nodes/k8s-node-setup.sh
index 5e43ceeda..341d08515 100644
--- a/seichi-onp-k8s/cluster-boot-up/scripts/nodes/k8s-node-setup.sh
+++ b/seichi-onp-k8s/cluster-boot-up/scripts/nodes/k8s-node-setup.sh
@@ -111,7 +111,7 @@ sysctl --system
 # Install kubeadm
 curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.28/deb/Release.key | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg
 echo 'deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v1.28/deb/ /' | sudo tee /etc/apt/sources.list.d/kubernetes.list
-apt-get install -y kubeadm=1.28.4-1.1 kubectl=1.28.4-1.1 kubelet=1.28.4-1.1
+apt-get install -y kubeadm=1.28.5-1.1 kubectl=1.28.5-1.1 kubelet=1.28.5-1.1
 apt-mark hold kubelet kubectl
 
 # Disable swap
@@ -290,7 +290,7 @@ etcd:
   local:
     extraArgs:
       listen-metrics-urls: http://0.0.0.0:2381
-kubernetesVersion: "v1.28.4"
+kubernetesVersion: "v1.28.5"
 controlPlaneEndpoint: "${KUBE_API_SERVER_VIP}:8443"
 apiServer:
   certSANs: