diff --git a/requirements.txt b/requirements.txt
index 6a26ad3..88ba2b9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -22,5 +22,5 @@ python-dateutil==2.6.1
 requests==2.22.0
 s3transfer==0.1.13
 setuptools==40.3.0
-six==1.12.0
+six==1.13.0
 transip==2.0.0