title: Heroku log warning "(node) sys is deprecated. Use util instead" when script runs
body: <p>I have deployed a node script in heroku to be run by a scheduler. But when the script runs I see a warning in the logs. </p>
  
  <pre><code>Dec 07 11:01:10 xxx heroku/scheduler.3255 Starting process with command `node bin/script` 
  Dec 07 11:01:13 xxx app/scheduler.3255:  (node) sys is deprecated. Use util instead. 
  </code></pre>
  
  <p>I have not declared a <code>engine</code> section in my <code>package.json</code>. </p>
  
  <p>Is a problem with the node version? How can I avoid this warning?</p>
  
  <p>Thanks!</p>