Specify Heroku addon version in app.json

Question

When using heroku addons:create, one may specify a version, e.g. as shown in this Heroku blog post introducing Postgres 9.5:

heroku addons:create heroku-postgresql --version=9.5

Answer 1

{
  "addons": [
    {
      "plan": "heroku-postgresql",
      "options": {
        "version": "9.5"
      }
    }
  ]
}

https://devcenter.heroku.com/articles/app-json-schema#example-app-json