diff --git a/doc/requirements.txt b/doc/requirements.txt
index 6da433c..50572bd 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -25,5 +25,5 @@ sphinx-autobuild==0.7.1
 sphinx-rtd-theme==0.2.4
 sphinxcontrib-websupport==1.0.1
 tornado==4.5.2
-urllib3==1.22
+urllib3==1.24.2
 watchdog==0.8.3