diff --git a/requirements.txt b/requirements.txt
index 52294b9..8fc34f1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,7 +15,7 @@ MarkupSafe==1.0
 python-dateutil==2.6.1
 python-editor==1.0.3
 requests==2.18.4
-six==1.11.0
+six==1.15.0
 SQLAlchemy==1.0.14
 urllib3==1.22
 Werkzeug==0.11.10