diff --git a/index.html b/index.html
index 00dd909..23f514d 100644
--- a/index.html
+++ b/index.html
@@ -4,6 +4,7 @@
 <head>
   <meta charset="UTF-8" />
   <meta http-equiv="Access-Control-Allow-Origin" content="*">
+  <meta http-equiv="Content-Security-Policy" content="upgrade-insecure-requests">
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
   <meta name="description" content="一个默默无闻的主页" />
   <meta name="keywords" content="無名,个人主页" />
