diff --git a/requirements.txt b/requirements.txt
index 093f45ed..59803132 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,5 +10,6 @@ readme_renderer
 Sphinx<=1.5.5
 PySocks
 setuptools>=18.5
+flake8
 tox
-detox
\ No newline at end of file
+detox