diff --git a/requirements.txt b/requirements.txt
index 02ad3d9..9ee16d8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -49,7 +49,7 @@ snowballstemmer==1.2.1
 Sphinx==1.7.6
 sphinxcontrib-websupport==1.1.0
 typing==3.6.4
-urllib3==1.23
+urllib3==1.26.5
 virtualenv==16.0.0
 virtualenv-clone==0.3.0
 Werkzeug==0.14.1