diff --git a/doc/requirements.txt b/doc/requirements.txt
index 2f7c209..0799cd2 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -9,5 +9,5 @@ pandas==0.25.1
 python-dateutil==2.8.0
 pytz==2019.3
 six==1.12.0
-urllib3==1.25.7
+urllib3==1.25.8
 Werkzeug==0.15.6