diff --git a/requirements.txt b/requirements.txt
index 683719d..e50ebe6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
+six
 wget
 numpy
 flask
@@ -5,4 +6,4 @@ gevent
 pillow
 shapely
 pyclipper
-opencv-python
\ No newline at end of file
+opencv-python