diff --git a/requirements/dev.txt b/requirements/dev.txt
index 0173913..0905c09 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -14,3 +14,4 @@ pyquery==1.2.9
 django-debug-toolbar==1.2.1
 ipdb==0.8
 ipython==2.3.0
+pygraphviz==1.2  # para usar o comando "graph_models" do "django-extensions"