wp_deregister_script(‘jquery’) not working

by

Use the Following sequence to override jquery
Install latest jQuery version 3.4.1.
Update the following sequence of code and try!!!!

      wp_deregister_script('jquery');
      wp_register_script('jquery',("https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"), 
   false);
      wp_enqueue_script('jquery');

I hope it will help you!!!