diff --git a/requirements.txt b/requirements.txt
index ce4f099..4e16ced 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,6 +10,6 @@ PyMySQL==0.9.3
 pyocr==0.6
 PyPDF2==1.26.0
 pytesseract==0.2.6
-six==1.12.0
+six==1.16.0
 SQLAlchemy==1.3.4
 Werkzeug==0.15.4