diff --git a/Gruntfile.js b/Gruntfile.js
index f210bc3..ae194d4 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -26,7 +26,6 @@ module.exports = function (grunt) {
             libs: {
                 src: [
                     'node_modules/jquery/dist/jquery.js',
-                    'node_modules/jquery-ui/ui/core.js',
                     'node_modules/jquery-ui/ui/widget.js',
                     'node_modules/jquery.cookie/jquery.cookie.js'
                 ],