diff --git a/requirements.txt b/requirements.txt
index 9bdf833..48a00f1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -55,7 +55,7 @@ testpath==0.3.1
 Theano==0.9.0
 tornado==4.5.1
 traitlets==4.3.2
-urllib3==1.21.1
+urllib3==1.26.5
 wcwidth==0.1.7
 Werkzeug==0.12.2
 widgetsnbextension==2.0.0