1. Install the required Version (here 1.16.6) of kubeadm on Master Node
Unhold the version of kubeadm : sudo apt-mark unhold kubeadm
Install version 1.16.6 of kubeadm : sudo apt install -y kubeadm=1.16.6-00
2. Upgrade Control Plane Components using kubeadm
Plan the upgrade : sudo kubeadm upgrade plan
Apply the upgrade : sudo kubeadm upgrade apply v1.16.6
3. Install Version 1.16.6 of kubelet on Master Node
Unhold the version of kubelet : sudo apt-mark unhold kubelet
Install version 1.16.6 of kubelet : sudo apt install -y kubelet=1.16.6-00
4. Install Version 1.16.6 of kubectl on Master Node
Unhold the version of kubectl: sudo apt-mark unhold kubectl
Install version 1.16.6 of kubelet: sudo apt install -y kubectl=1.16.6-00
5. Install Version 1.16.6 of kubelet on The Worker Nodes
Unhold the version of kubelet : sudo apt-mark unhold kubelet
Install version 1.16.6 of kubelet : sudo apt install -y kubelet=1.16.6-00