diff --git a/simpledemo.html b/simpledemo.html
index 5eff05f..610723c 100644
--- a/simpledemo.html
+++ b/simpledemo.html
@@ -15,7 +15,7 @@ You should have received a copy of the GNU General Public License along with thi
     <meta charset='utf-8'>
     <meta name='viewport' content='width=device-width,initial-scale=1'>
     <title>NetSpeaker Demo (on [IP here])</title>
-    <link href='http://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/css/bootstrap.min.css' rel='stylesheet'
+    <link href='https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/css/bootstrap.min.css' rel='stylesheet'
           integrity='sha384-T3c6CoIi6uLrA9TneNEoa7RxnatzjcDSCmG1MXxSR1GAsXEV/Dwwykc2MPK8M2HN' crossorigin='anonymous'>
     <style>#playbackMuteButton:hover { background-color: #00000000; }</style>
 </head>