diff --git a/requirements-dev.txt b/requirements-dev.txt
index d345a41..362d2ff 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -99,7 +99,7 @@ tqdm==4.28.1
 traitlets==4.3.2
 typing==3.6.6
 tzlocal==1.5.1
-urllib3==1.24.1
+urllib3==1.26.5
 vega-datasets==0.5.0
 wcwidth==0.1.7
 webencodings==0.5.1