diff --git a/app/views/admin/plugins.html.erb b/app/views/admin/plugins.html.erb
index 9a9c71e..117735c 100644
--- a/app/views/admin/plugins.html.erb
+++ b/app/views/admin/plugins.html.erb
@@ -25,7 +25,7 @@ $(document).ready(function(){
     e.preventDefault();
     $.ajax({
       dataType: "jsonp",
-      url: "http://www.redmine.org/plugins/check_updates",
+      url: "https://www.redmine.org/plugins/check_updates",
       data: <%= raw_json plugin_data_for_updates(@plugins) %>,
       timeout: 3000,
       beforeSend: function(){