CR&rsquo;s will cause controllers or <code>istioctl</code> commands to interfere with each other.</p><h3 id=upgrade-with-istioctl>Upgrade with <code>istioctl</code></h3><p>Let&rsquo;s assume that the target version is 1.8.1.</p><ol><li><p>Download the Istio 1.8.1 release and use the <code>istioctl</code> from that release to install the Istio 1.8.1 control plane:</p><pre><code class=language-bash data-expandlinks=true data-repo=istio>$ istio-1.8.1/bin/istioctl install -f control-plane.yaml --revision 1-8-1
