diff --git a/app.json b/app.json
deleted file mode 100644
index 3c3c7a87913..00000000000
--- a/app.json
+++ /dev/null
@@ -1,45 +0,0 @@
-{
-    "name": "EC-CUBE4",
-    "description": "EC-CUBE 4 on Heroku",
-    "website": "https://github.com/EC-CUBE/ec-cube",
-    "repository": "https://github.com/EC-CUBE/ec-cube",
-    "keywords": ["php", "ec", "e-commerce", "ec-cube"],
-    "addons": [
-        {
-            "plan": "heroku-postgresql",
-            "options": {
-              "version": "12"
-            }
-        }
-    ],
-    "env": {
-        "APP_ENV": {
-            "description": "prod|dev",
-            "value": "prod"
-        },
-        "APP_DEBUG": {
-            "description": "1|0",
-            "value": "0"
-        },
-        "DATABASE_SERVER_VERSION": {
-            "description": "Database server version.",
-            "value": "12"
-        },
-        "ECCUBE_AUTH_MAGIC": {
-            "description": "Secret key for login password.",
-            "generator": "secret"
-        },
-        "ECCUBE_ADMIN_USER": {
-            "description": "The login id of admin user.",
-            "value": "admin"
-        },
-        "ECCUBE_ADMIN_PASS": {
-            "description": "The password of admin user."
-        }
-    },
-    "buildpacks": [
-        {
-            "url": "heroku/php"
-        }
-    ]
-}