diff --git a/lib/util/PoweredByUtil.js b/lib/util/PoweredByUtil.js
index b3250e38..721d6ba1 100644
--- a/lib/util/PoweredByUtil.js
+++ b/lib/util/PoweredByUtil.js
@@ -57,12 +57,12 @@ var LIGHTBOX_MARKUP =
   '<div class="bjs-powered-by-lightbox" style="' + LIGHTBOX_STYLES + '">' +
     '<div class="backdrop" style="' + BACKDROP_STYLES + '"></div>' +
     '<div class="notice" style="' + NOTICE_STYLES + '">' +
-      '<a href="https://bpmn.io" target="_blank" style="margin: 15px 20px 15px 10px; align-self: center;' + LINK_STYLES + '">' +
+      '<a href="https://bpmn.io" target="_blank" rel="noopener" style="margin: 15px 20px 15px 10px; align-self: center;' + LINK_STYLES + '">' +
         BPMNIO_IMG +
       '</a>' +
       '<span>' +
         'Web-based tooling for BPMN, DMN and CMMN diagrams ' +
-        'powered by <a href="https://bpmn.io" target="_blank">bpmn.io</a>.' +
+        'powered by <a href="https://bpmn.io" target="_blank" rel="noopener">bpmn.io</a>.' +
       '</span>' +
     '</div>' +
   '</div>';