diff --git a/dev_requirements.txt b/dev_requirements.txt
index 028cbebd..d11b5c1f 100644
--- a/dev_requirements.txt
+++ b/dev_requirements.txt
@@ -1,5 +1,9 @@
 # Tests
+flake8
+-e git+https://github.com/public/flake8-import-order#egg=flake8-import-order
 mock
+sphinx
+tox
 
 # Optional Packages
 Markdown