good question… Have made an issue here for a new buildpack release - current release is from 2015(sic!)…
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The pull request https://github.com/HashNuke/heroku-buildpack-elixir/pull/140 to default to 1.5.3 was merged in but it wasn’t bundled in a release (create new release v4 · Issue #145 · HashNuke/heroku-buildpack-elixir · GitHub).
Although the changes are on master, it appears that the command now in the guide uses heroku create --buildpack hashnuke/elixir which seems to route to the latest release (without master changes). However, if you specify heroku create --buildpack https://github.com/HashNuke/heroku-buildpack-elixir.git it will pick up the changes.
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