diff --git a/requirements.txt b/requirements.txt
index 923bcb0..5a41a6f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -129,7 +129,7 @@ tqdm==4.26.0
 traitlets==4.3.2
 uproot==3.0.3
 uproot-methods==0.1.2
-urllib3==1.23
+urllib3==1.24.2
 wcwidth==0.1.7
 webencodings==0.5.1
 Werkzeug==0.14.1