diff --git a/requirements/dev-requirements.txt b/requirements/dev-requirements.txt
index 7246f4a..c9ac018 100644
--- a/requirements/dev-requirements.txt
+++ b/requirements/dev-requirements.txt
@@ -1,2 +1,3 @@
 -r requirements.txt
 django-debug-toolbar==3.2.4
+pygraphviz==1.7
diff --git a/sigi/settings/base.py b/sigi/settings/base.py
index b02ca8c..3464552 100644
--- a/sigi/settings/base.py
+++ b/sigi/settings/base.py
@@ -28,6 +28,7 @@ INSTALLED_APPS = [
     'django.contrib.sessions',
     'django.contrib.messages',
     'django.contrib.staticfiles',
+    'django_extensions',
 ]
 
 MIDDLEWARE = [