diff --git a/requirements.txt b/requirements.txt
index da5244a..56101b3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,3 +3,4 @@ asyncio==3.4.3
 websockets==7.0
 pylint==2.2.2
 pytest-asyncio==0.6.0
+six==1.12.0