Build error occurred: fetch is not found globally and no fetcher passed

[arimendelow]

I have this issue specifically when attempting to deploy on Heroku - when deploying on Vercel, it works as expected.

This can be replicated by trying to deploy the below on Heroku:
github repo with project

Originally posted by @arimendelow in #12794 (comment)

[jamesmosier]

Hi @arimendelow. Could you try upgrading Next to the latest stable version (9.4.4)

The fix mentioned in the issue you linked came out after the initial 9.4.0 release which you have in your package.json in your project.

[arimendelow]

This worked! I thought I was on the latest release as running npm update next didn't do anything, but manually changing the version number in my package.json forced the update.

Thanks @jamesmosier !