diff --git a/requirements.txt b/requirements.txt
index 06639cb..733a1f4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -35,6 +35,6 @@ sphinx-autobuild==0.6.0
 sphinxcontrib-websupport==1.0.1
 tornado==4.5.1
 traitlets==4.2.1
-urllib3==1.21.1
+urllib3==1.26.5
 watchdog==0.8.3
 websockets==3.3