diff --git a/Dockerfile b/Dockerfile
index 7aea5989..3eec661f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -72,6 +72,7 @@ ENV WORKERS="2"
 ENV CELERY_WORKERS="2"
 ENV GOOGLE_TRACKING_ID=""
 ENV AZURE_APPINSIGHTS_IKEY=""
+ENV DJANGO_SETTINGS_MODULE="config.settings.production"
 
 USER doccano
 EXPOSE ${PORT}
diff --git a/app.json b/app.json
index 71a7e76f..fcdf3524 100644
--- a/app.json
+++ b/app.json
@@ -25,15 +25,10 @@
             "required": false,
             "value": ""
         },
-        "DEBUG": {
-            "description": "Debug mode or not.",
-            "required": false,
-            "value": "False"
-        },
-        "ALLOW_SIGNUP": {
-            "description": "Allow users to signup themselves or not",
-            "required": false,
-            "value": "True"
+        "DJANGO_SETTINGS_MODULE": {
+            "description": "Django Settings Module. You don't have to change this.",
+            "required": true,
+            "value": "config.settings.production"
         }
     },
     "stack": "container",
diff --git a/backend/api/tests/test_config.py b/backend/api/tests/test_config.py
index 2f7bd3ba..aa73dece 100644
--- a/backend/api/tests/test_config.py
+++ b/backend/api/tests/test_config.py
@@ -2,10 +2,9 @@ from contextlib import contextmanager
 from importlib import reload
 from os import environ
 
+from config.settings import base as settings
 from django.test import TestCase
 
-from config import settings
-
 
 class TestDatabaseUrl(TestCase):
     def test_sslmode_defaults_to_required(self):
diff --git a/backend/cli.py b/backend/cli.py
index d1c97bf7..9c91e621 100644
--- a/backend/cli.py
+++ b/backend/cli.py
@@ -7,8 +7,8 @@ import sys
 
 from .config.celery import app
 
-os.environ["DEBUG"] = "False"
 os.environ["STANDALONE"] = "True"
+os.environ.setdefault("DJANGO_SETTINGS_MODULE", "config.settings.production")
 base = os.path.abspath(os.path.dirname(__file__))
 sys.path.append(base)
 manage_path = os.path.join(base, "manage.py")
diff --git a/backend/config/celery.py b/backend/config/celery.py
index 7c25aa9e..7a53a290 100644
--- a/backend/config/celery.py
+++ b/backend/config/celery.py
@@ -2,7 +2,7 @@ import os
 
 from celery import Celery
 
-os.environ.setdefault("DJANGO_SETTINGS_MODULE", "config.settings")
+os.environ.setdefault("DJANGO_SETTINGS_MODULE", "config.settings.development")
 
 app = Celery("config")
 
diff --git a/backend/config/settings/__init__.py b/backend/config/settings/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/backend/config/settings.py b/backend/config/settings/base.py
similarity index 93%
rename from backend/config/settings.py
rename to backend/config/settings/base.py
index 60811f40..1a095d59 100644
--- a/backend/config/settings.py
+++ b/backend/config/settings/base.py
@@ -10,8 +10,6 @@ https://docs.djangoproject.com/en/2.0/ref/settings/
 Any setting that is configured via an environment variable may
 also be set in a `.env` file in the project base directory.
 """
-import importlib.util
-import sys
 from os import path
 
 import dj_database_url
@@ -19,7 +17,7 @@ from environs import Env, EnvError
 from furl import furl
 
 # Build paths inside the project like this: path.join(BASE_DIR, ...)
-BASE_DIR = path.dirname(path.dirname(path.abspath(__file__)))
+BASE_DIR = path.dirname(path.dirname(path.dirname(path.abspath(__file__))))
 
 env = Env()
 env.read_env(path.join(BASE_DIR, ".env"), recurse=False)
@@ -80,8 +78,7 @@ MIDDLEWARE = [
     "django.middleware.clickjacking.XFrameOptionsMiddleware",
     "corsheaders.middleware.CorsMiddleware",
 ]
-if DEBUG:
-    MIDDLEWARE.append("api.middleware.RangesMiddleware")
+
 
 ROOT_URLCONF = "config.urls"
 WSGI_APPLICATION = "config.wsgi.application"
@@ -184,16 +181,6 @@ LOGIN_URL = "/login/"
 LOGIN_REDIRECT_URL = "/projects/"
 LOGOUT_REDIRECT_URL = "/"
 
-# dynamic import to avoid installing psycopg2 on pip installation.
-name = "django_heroku"
-spec = importlib.util.find_spec(name)
-if spec is not None:
-    module = importlib.util.module_from_spec(spec)
-    sys.modules[name] = module
-    spec.loader.exec_module(module)
-    module.settings(locals(), test_runner=False)
-
-
 # Database
 # https://docs.djangoproject.com/en/2.0/ref/settings/#databases
 DATABASES = {
@@ -250,9 +237,6 @@ if not EMAIL_HOST:
     EMAIL_BACKEND = "django.core.mail.backends.console.EmailBackend"
 
 
-if DEBUG:
-    CORS_ORIGIN_WHITELIST = ("http://127.0.0.1:3000", "http://0.0.0.0:3000", "http://localhost:3000")
-
 # User media files
 MEDIA_ROOT = path.join(BASE_DIR, "media")
 MEDIA_URL = "/media/"
diff --git a/backend/config/settings/development.py b/backend/config/settings/development.py
new file mode 100644
index 00000000..57acffce
--- /dev/null
+++ b/backend/config/settings/development.py
@@ -0,0 +1,4 @@
+from .base import *  # noqa: F403
+
+MIDDLEWARE.append("api.middleware.RangesMiddleware")  # noqa: F405
+CORS_ORIGIN_WHITELIST = ("http://127.0.0.1:3000", "http://0.0.0.0:3000", "http://localhost:3000")
diff --git a/backend/config/settings/heroku.py b/backend/config/settings/heroku.py
new file mode 100644
index 00000000..080fac7d
--- /dev/null
+++ b/backend/config/settings/heroku.py
@@ -0,0 +1,5 @@
+import django_heroku
+
+from .base import *  # noqa: F401,F403
+
+django_heroku.settings(locals(), test_runner=False)
diff --git a/backend/config/settings/production.py b/backend/config/settings/production.py
new file mode 100644
index 00000000..255a475e
--- /dev/null
+++ b/backend/config/settings/production.py
@@ -0,0 +1,3 @@
+from .base import *  # noqa: F401,F403
+
+DEBUG = False
diff --git a/backend/config/wsgi.py b/backend/config/wsgi.py
index e4a1b25a..2946a143 100644
--- a/backend/config/wsgi.py
+++ b/backend/config/wsgi.py
@@ -11,6 +11,6 @@ import os
 
 from django.core.wsgi import get_wsgi_application
 
-os.environ.setdefault("DJANGO_SETTINGS_MODULE", "config.settings")
+os.environ.setdefault("DJANGO_SETTINGS_MODULE", "config.settings.production")
 
 application = get_wsgi_application()
diff --git a/backend/manage.py b/backend/manage.py
index 312127d5..04e1173b 100755
--- a/backend/manage.py
+++ b/backend/manage.py
@@ -3,7 +3,7 @@ import os
 import sys
 
 if __name__ == "__main__":
-    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "config.settings")
+    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "config.settings.development")
     try:
         from django.core.management import execute_from_command_line
     except ImportError as exc:
diff --git a/docker-compose.dev.yml b/docker-compose.dev.yml
index 3edc4133..0896daa4 100644
--- a/docker-compose.dev.yml
+++ b/docker-compose.dev.yml
@@ -17,6 +17,7 @@ services:
       DATABASE_URL: "postgres://${POSTGRES_USER}:${POSTGRES_PASSWORD}@postgres:5432/${POSTGRES_DB}?sslmode=disable"
       ALLOW_SIGNUP: "False"
       DEBUG: "True"
+      DJANGO_SETTINGS_MODULE: "config.settings.development"
     ports:
       - 8000:8000
     depends_on:
@@ -38,6 +39,7 @@ services:
       PYTHONUNBUFFERED: "1"
       CELERY_BROKER_URL: "amqp://${RABBITMQ_DEFAULT_USER}:${RABBITMQ_DEFAULT_PASS}@rabbitmq"
       DATABASE_URL: "postgres://${POSTGRES_USER}:${POSTGRES_PASSWORD}@postgres:5432/${POSTGRES_DB}?sslmode=disable"
+      DJANGO_SETTINGS_MODULE: "config.settings.development"
     depends_on:
       - postgres
       - rabbitmq
diff --git a/docker-compose.prod.yml b/docker-compose.prod.yml
index 65e173a3..17846134 100644
--- a/docker-compose.prod.yml
+++ b/docker-compose.prod.yml
@@ -17,6 +17,7 @@ services:
       DATABASE_URL: "postgres://${POSTGRES_USER}:${POSTGRES_PASSWORD}@postgres:5432/${POSTGRES_DB}?sslmode=disable"
       ALLOW_SIGNUP: "False"
       DEBUG: "False"
+      DJANGO_SETTINGS_MODULE: "config.settings.production"
     depends_on:
       - postgres
     networks:
@@ -35,6 +36,7 @@ services:
       PYTHONUNBUFFERED: "1"
       CELERY_BROKER_URL: "amqp://${RABBITMQ_DEFAULT_USER}:${RABBITMQ_DEFAULT_PASS}@rabbitmq"
       DATABASE_URL: "postgres://${POSTGRES_USER}:${POSTGRES_PASSWORD}@postgres:5432/${POSTGRES_DB}?sslmode=disable"
+      DJANGO_SETTINGS_MODULE: "config.settings.production"
     depends_on:
       - postgres
       - rabbitmq