diff --git a/README.md b/README.md
index 0864490..9b507b4 100644
--- a/README.md
+++ b/README.md
@@ -57,7 +57,7 @@ Copy [https://cdn.jsdelivr.net/gh/keita-makino/qualtrics-map/dist/bundle.js](htt
 </script><br />
 <link href="https://api.mapbox.com/mapbox-gl-js/plugins/mapbox-gl-geocoder/v5.0.0/mapbox-gl-geocoder.css" rel="stylesheet" type="text/css" />
 <link href="https://api.mapbox.com/mapbox-gl-js/v3.1.0/mapbox-gl.css" rel="stylesheet" />
-<script src="https://cdn.jsdelivr.net/gh/keita-makino/qualtrics-map@3.0.1/dist/bundle.js"></script>
+<script src="https://cdn.jsdelivr.net/gh/keita-makino/qualtrics-map@3.1.0/dist/bundle.js"></script>
 ```
 
 ### JavaScript coding