change default source of jQuery in wordpress

WordPress_Jquery.php

<?php
  function add_scripts() {
    wp_deregister_script( 'jquery' );
    wp_register_script( 'jquery',
    '//ajax.googleapis.com/ajax/libs/jqueryui/1.10.3/jquery-ui.min.js');
    wp_enqueue_script( 'jquery' );
  }
  
  add_action('wp_enqueue_scripts', 'add_scripts');