From 6773dcf31eea6c2ba2b1ad7116e4fc0603aa61db Mon Sep 17 00:00:00 2001
From: Dominik Sander <git@dsander.de>
Date: Sat, 22 Sep 2018 11:37:40 +0200
Subject: [PATCH] Set Heroku stack to `heroku-16` in app.json

The graphviz buildpack does not support the new default `heroku-18`
stack yet. Until it does we have to fall back to the older stack.

 #2377
---
 app.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/app.json b/app.json
index 25d55d25..85ed1e23 100644
--- a/app.json
+++ b/app.json
@@ -21,5 +21,6 @@
       "postdeploy": "bundle exec rake db:migrate"
     },
     "addons": ["heroku-postgresql"],
-    "success_url": "/users/sign_up"
+    "success_url": "/users/sign_up",
+    "stack": "heroku-16"
 }