Deploy node server on heroku and receive "SyntaxError: Unexpected token import"

I have a server written in node.js using node 6.10.2 and ecmascript. I want to upload it to heroku, locally when i rung the server with "npm start" the server starts without a problem, but on heroku I recevied the following error

import express from 'express';

SyntaxError: Unexpected token import

How can I fix this error?

Thanks

via Dorin