heroku fails to create app from default node-js-sample - node.js

Question

I forked node-js-sample and made just added index.htm with some content
When I click the button "Doploy to heroku" app fails to build with following error:
-----> Node.js app detected
-----> Creating runtime environment
NPM_CONFIG_LOGLEVEL=error
NODE_ENV=production
NODE_MODULES_CACHE=true
NODE_VERBOSE=false
-----> Installing binaries
engines.node (package.json): 4.0.0
engines.npm (package.json): unspecified (use default)
Resolving node version 4.0.0...
Downloading and installing node 4.0.0...
Detected package-lock.json: defaulting npm to version 5.x.x
Bootstrapping npm 5.x.x (replacing 2.14.2)...
npm 5.x.x installed
ERROR: npm is known not to run on Node.js v4.0.0
Node.js 4 is supported but the specific version you're running has
a bug known to break npm. Please update to at least 4.7.0 to use this
version of npm. You can find the latest release of Node.js at
https://nodejs.org/
ERROR: npm is known not to run on Node.js v4.0.0
Node.js 4 is supported but the specific version you're running has
a bug known to break npm. Please update to at least 4.7.0 to use this
version of npm. You can find the latest release of Node.js at
https://nodejs.org/
ERROR: npm is known not to run on Node.js v4.0.0
Node.js 4 is supported but the specific version you're running has
a bug known to break npm. Please update to at least 4.7.0 to use this
version of npm. You can find the latest release of Node.js at
https://nodejs.org/
-----> Change to Node.js build process
Heroku has begun executing the "build" script defined in package.json
during Node.js builds.
Read more: https://devcenter.heroku.com/changelog-items/1573
-----> Build failed
We're sorry this build is failing! You can troubleshoot common issues here:
https://devcenter.heroku.com/articles/troubleshooting-node-deploys
If you're stuck, please submit a ticket so we can help:
https://help.heroku.com/
Love,
Heroku
! Push rejected, failed to compile Node.js app.
! Push failed
From what I understand heroku try to runs my code with incorrect version of node.js, but why?

Answer 1

The repository hasn't been updated in 4 or more years and still depend on node.js 4 and lists the same on the package.json. It is a compatibility issue, before deploying change it to 6.0.0 and try, you might have luck.

Answer 2

Ran into the same issue recently which was a real pain, found a solution here https://devcenter.heroku.com/articles/nodejs-support
Currently, supported versions are 10.x, 12.x, 13.x, and 14.x.
You should always specify a Node.js version that matches the runtime
you’re developing and testing with.
Updated node globally and specified the engine in package.json like:
"engines": {
"node": "10.20.x"
},
Hope this helps someone