>.</p><p>These release notes describe what&rsquo;s different between Istio 1.5.8 and Istio 1.5.9.</p><div class="relnote-actions call-to-action"><a class=entry href=/v1.23/news/releases/1.5.x/announcing-1.5/upgrade-notes/><h5>BEFORE YOU UPGRADE</h5><p>Things to know and prepare before upgrading.</p></a><a class="update-notice entry" data-title='Update Notice' data-downloadhref=https://github.com/istio/istio/releases/tag/1.5.9 data-downloadbuttontext="DOWNLOAD 1.5.9" data-updateadvice="Before you download 1.