diff --git a/apis/management.cattle.io/v3/k8s_defaults.go b/apis/management.cattle.io/v3/k8s_defaults.go
index 53aecb4a..eef17f95 100644
--- a/apis/management.cattle.io/v3/k8s_defaults.go
+++ b/apis/management.cattle.io/v3/k8s_defaults.go
@@ -9,7 +9,7 @@ import (
 )
 
 const (
-	DefaultK8s = "v1.12.1-rancher1-1"
+	DefaultK8s = "v1.12.3-rancher1-1"
 )
 
 var (
@@ -20,7 +20,7 @@ var (
 		"v1.9.7-rancher2-2",
 		"v1.10.5-rancher1-2",
 		"v1.11.3-rancher1-1",
-		"v1.12.1-rancher1-1",
+		"v1.12.3-rancher1-1",
 	}
 
 	// K8sVersionToRKESystemImages is dynamically populated on init() with the latest versions
@@ -576,6 +576,32 @@ var (
 			IngressBackend:            m("k8s.gcr.io/defaultbackend:1.4"),
 			MetricsServer:             m("gcr.io/google_containers/metrics-server-amd64:v0.3.1"),
 		},
+		"v1.12.3-rancher1-1": {
+			Etcd:                      m("quay.io/coreos/etcd:v3.2.24"),
+			Kubernetes:                m("rancher/hyperkube:v1.12.3-rancher1"),
+			Alpine:                    m("rancher/rke-tools:v0.1.16"),
+			NginxProxy:                m("rancher/rke-tools:v0.1.16"),
+			CertDownloader:            m("rancher/rke-tools:v0.1.16"),
+			KubernetesServicesSidecar: m("rancher/rke-tools:v0.1.16"),
+			KubeDNS:                   m("gcr.io/google_containers/k8s-dns-kube-dns-amd64:1.14.13"),
+			DNSmasq:                   m("gcr.io/google_containers/k8s-dns-dnsmasq-nanny-amd64:1.14.13"),
+			KubeDNSSidecar:            m("gcr.io/google_containers/k8s-dns-sidecar-amd64:1.14.13"),
+			KubeDNSAutoscaler:         m("gcr.io/google_containers/cluster-proportional-autoscaler-amd64:1.0.0"),
+			Flannel:                   m("quay.io/coreos/flannel:v0.10.0"),
+			FlannelCNI:                m("quay.io/coreos/flannel-cni:v0.3.0"),
+			CalicoNode:                m("quay.io/calico/node:v3.1.3"),
+			CalicoCNI:                 m("quay.io/calico/cni:v3.1.3"),
+			CalicoCtl:                 m("quay.io/calico/ctl:v2.0.0"),
+			CanalNode:                 m("quay.io/calico/node:v3.1.3"),
+			CanalCNI:                  m("quay.io/calico/cni:v3.1.3"),
+			CanalFlannel:              m("quay.io/coreos/flannel:v0.10.0"),
+			WeaveNode:                 m("weaveworks/weave-kube:2.1.2"),
+			WeaveCNI:                  m("weaveworks/weave-npc:2.1.2"),
+			PodInfraContainer:         m("gcr.io/google_containers/pause-amd64:3.1"),
+			Ingress:                   m("rancher/nginx-ingress-controller:0.16.2-rancher1"),
+			IngressBackend:            m("k8s.gcr.io/defaultbackend:1.4"),
+			MetricsServer:             m("gcr.io/google_containers/metrics-server-amd64:v0.3.1"),
+		},
 	}
 )
 
diff --git a/apis/management.cattle.io/v3/k8s_windows_default.go b/apis/management.cattle.io/v3/k8s_windows_default.go
index fcdaa85a..bc01f71f 100644
--- a/apis/management.cattle.io/v3/k8s_windows_default.go
+++ b/apis/management.cattle.io/v3/k8s_windows_default.go
@@ -206,6 +206,14 @@ var (
 			CanalCNIBinaries:   m("rancher/canal-cni:v0.0.1-nanoserver-1803"),
 			KubeletPause:       m("rancher/kubelet-pause:v0.0.1-nanoserver-1803"),
 		},
+		"v1.12.3-rancher1-1": {
+			NginxProxy:         m("rancher/nginx-proxy:v0.0.1-nanoserver-1803"),
+			KubernetesBinaries: m("rancher/hyperkube:v1.12.3-nanoserver-1803"),
+			FlannelCNIBinaries: m("rancher/flannel-cni:v0.0.1-nanoserver-1803"),
+			CalicoCNIBinaries:  m("rancher/calico-cni:v0.0.1-nanoserver-1803"),
+			CanalCNIBinaries:   m("rancher/canal-cni:v0.0.1-nanoserver-1803"),
+			KubeletPause:       m("rancher/kubelet-pause:v0.0.1-nanoserver-1803"),
+		},
 	}
 )