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herokuでrubyのバージョンに合わせてherokuのバージョンを下げる

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herokuでデプロイする際に現状のruby(2.3.1)をバージョンアップが難しくheroku側で対応する際にうまく行かなかったのでメモ。

ターミナルから

heroku stack:set heroku-16

と打ってもエラーが出る。

 >   Error: Missing required flag:
 ›     -a, --app APP  app to run command against
 ›   See more help with --help

heroku helpで確認するとアプリケーション名を明示しないといけないようだ。だが、今の所アプリはなし。そこで先にheroku createして

heroku stack:set heroku-16 -a [app-name]

で解決。

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