diff --git a/index.html b/index.html
index 680908e..38eb4d3 100644
--- a/index.html
+++ b/index.html
@@ -3,7 +3,7 @@
 <head>
 <link rel="stylesheet" href="https://www.yatex.org/libcache/leaflet-1.7.1/leaflet.css" />
 <script src="https://www.yatex.org/libcache/leaflet-1.7.1/leaflet.js"></script>
-<script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=Promise"></script>
+<script src="./plugin/leaflet-plugins-master/layer/tile/Bing.js"></script>
 
 <style>
 div#hogemap {width: 90vw; height: 80vh; margin: 0 auto;}
