I only tried using <a href="https:&#x2F;&#x2F;cloud.google.com&#x2F;nodejs&#x2F;" rel="nofollow">https:&#x2F;&#x2F;cloud.google.com&#x2F;nodejs&#x2F;</a> and it supports any official version available in the site that you indicate in the &quot;engines&quot; field. Tried 5.6 (App Engine) and it worked.
<a href="https:&#x2F;&#x2F;docs.npmjs.com&#x2F;files&#x2F;package.json#engines" rel="nofollow">https:&#x2F;&#x2F;docs.npmjs.com&#x2F;files&#x2F;package.json#engines</a>