diff --git a/examples/flask/requirements.txt b/examples/flask/requirements.txt
index 4385a34..df49a1a 100644
--- a/examples/flask/requirements.txt
+++ b/examples/flask/requirements.txt
@@ -28,7 +28,7 @@ python-dateutil==2.7.3
 requests==2.19.1
 six==1.11.0
 termcolor==1.1.0
-urllib3==1.23
+urllib3==1.26.5
 visitor==0.1.3
 Werkzeug==0.14.1
 wrapt==1.10.11