de: Citadel, Ingress gateway, Egress gateway, Pilot, Policy, Telemetry and
Sidecar injector.</p><h4 id=helm-upgrade>Helm upgrade</h4><p>If you installed Istio with <a href=/v1.0/docs/setup/kubernetes/helm-install/#option-2-install-with-helm-and-tiller-via-helm-install>Helm</a> the preferred upgrade option is to let Helm take care of the upgrade:</p><pre><code class=language-command>$ helm upgrade istio install/kubernetes/helm/istio --namespace istio-system</code></pre><h4 id=kubernetes-rolling-update>Kubern