diff --git a/requirements.txt b/requirements.txt
index c98ec18c4..7ecb901ac 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,5 +13,6 @@ MarkupSafe==1.0
 misaka==2.1.0
 mistune==0.8.3
 oauth2==1.9.0.post1
+pycodestyle==2.3.1
 pycparser==2.18
 Werkzeug==0.14.1
\ No newline at end of file