diff --git a/docs/index.html b/docs/index.html
index 869443a..114f8a2 100755
--- a/docs/index.html
+++ b/docs/index.html
@@ -8,8 +8,7 @@
   <meta name="keywords" content="中国, 省份, 城市, 行政区, 省市区, 三级联动, 地址选择器, HTML, CSS, JS, JavaScript, jQuery plugin, province, city, district, pick, picker, picking, front-end, frontend, web development">
   <meta name="author" content="Fengyuan Chen">
   <title>Distpicker</title>
-  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/css/tether.min.css">
-  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css">
+  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css">
   <link href="css/main.css" rel="stylesheet">
 </head>
 <body>
@@ -18,7 +17,7 @@
   <![endif]-->
 
   <!-- Header -->
-  <header class="navbar navbar-light navbar-toggleable-md">
+  <header class="navbar navbar-light navbar-expand-md">
     <div class="container">
       <a class="navbar-brand" href="./">Distpicker</a>
       <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbar-collapse" aria-controls="navbar-collapse" aria-expanded="false" aria-label="Toggle navigation">
@@ -340,8 +339,8 @@ <h3>Without placeholders</h3>
 
   <!-- Scripts -->
   <script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
-  <script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js"></script>
-  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js"></script>
+  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.11.0/umd/popper.min.js"></script>
+  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/js/bootstrap.min.js"></script>
   <script src="https://cdn.rawgit.com/google/code-prettify/master/loader/run_prettify.js"></script>
   <script src="https://fengyuanchen.github.io/js/common.js"></script>
   <script src="js/distpicker.js"></script>
