Can't update Craft 3, permissions issue

Question

Upon running the update tool in the Craft CMS, I get this error.

Error: file_put_contents(path/to/file/composer.json): failed to open stream: Permission denied

What permissions are causing this error? Is it simply the case of changing the perms on the composer.json file? If so, what should they be?

Thanks!

Answer 1

Here are the required Craft 3 file permissions: https://docs.craftcms.com/v3/installation.html#step-2-set-the-file-permissions