diff --git a/cluster/gce/config-default.sh b/cluster/gce/config-default.sh
index 91ad0be7b3..26a3ce816b 100755
--- a/cluster/gce/config-default.sh
+++ b/cluster/gce/config-default.sh
@@ -79,7 +79,7 @@ fi
 # you are updating the os image versions, update this variable.
 # Also please update corresponding image for node e2e at:
 # https://github.com/kubernetes/kubernetes/blob/master/test/e2e_node/jenkins/image-config.yaml
-GCI_VERSION=${KUBE_GCI_VERSION:-cos-stable-65-10323-64-0}
+GCI_VERSION=${KUBE_GCI_VERSION:-cos-beta-73-11647-64-0}
 MASTER_IMAGE=${KUBE_GCE_MASTER_IMAGE:-}
 MASTER_IMAGE_PROJECT=${KUBE_GCE_MASTER_PROJECT:-cos-cloud}
 NODE_IMAGE=${KUBE_GCE_NODE_IMAGE:-${GCI_VERSION}}
diff --git a/cluster/gce/config-test.sh b/cluster/gce/config-test.sh
index 774154f6bd..61d0a29967 100755
--- a/cluster/gce/config-test.sh
+++ b/cluster/gce/config-test.sh
@@ -86,7 +86,7 @@ ALLOWED_NOTREADY_NODES="${ALLOWED_NOTREADY_NODES:-$(($(get-num-nodes) / 100))}"
 # you are updating the os image versions, update this variable.
 # Also please update corresponding image for node e2e at:
 # https://github.com/kubernetes/kubernetes/blob/master/test/e2e_node/jenkins/image-config.yaml
-GCI_VERSION=${KUBE_GCI_VERSION:-cos-stable-65-10323-64-0}
+GCI_VERSION=${KUBE_GCI_VERSION:-cos-beta-73-11647-64-0}
 MASTER_IMAGE=${KUBE_GCE_MASTER_IMAGE:-}
 MASTER_IMAGE_PROJECT=${KUBE_GCE_MASTER_PROJECT:-cos-cloud}
 NODE_IMAGE=${KUBE_GCE_NODE_IMAGE:-${GCI_VERSION}}
diff --git a/cluster/kubemark/gce/config-default.sh b/cluster/kubemark/gce/config-default.sh
index 46cd1fef84..882657687f 100644
--- a/cluster/kubemark/gce/config-default.sh
+++ b/cluster/kubemark/gce/config-default.sh
@@ -40,7 +40,7 @@ EVENT_PD=${EVENT_PD:-false}
 
 MASTER_OS_DISTRIBUTION=${KUBE_MASTER_OS_DISTRIBUTION:-gci}
 NODE_OS_DISTRIBUTION=${KUBE_NODE_OS_DISTRIBUTION:-gci}
-MASTER_IMAGE=${KUBE_GCE_MASTER_IMAGE:-cos-stable-65-10323-64-0}
+MASTER_IMAGE=${KUBE_GCE_MASTER_IMAGE:-cos-beta-73-11647-64-0}
 MASTER_IMAGE_PROJECT=${KUBE_GCE_MASTER_PROJECT:-cos-cloud}
 CLEANUP_KUBEMARK_IMAGE=${CLEANUP_KUBEMARK_IMAGE:-true}