le=treeitem title="Upgrade or downgrade Istio using the istioctl upgrade command." href=/v1.5/docs/setup/upgrade/istioctl-upgrade/>Upgrade Istio using istioctl</a></li><li role=none><a role=treeitem title="Upgrade the Istio control plane, and optionally, the CNI plug-in using Helm." href=/v1.5/docs/setup/upgrade/cni-helm-upgrade/>Upgrade using Helm</a></li></ul></li><li role=treeitem aria-label="More Guides"><button aria-hidden=true></button><a title="More information on additional setup tasks." href=/v1.5/