diff --git a/requirements-dev.txt b/requirements-dev.txt
index a5a86e7..557dd5c 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -36,6 +36,6 @@ PyYAML==3.12
 requests==2.16.4
 s3transfer==0.1.4
 six==1.10.0
-urllib3==1.21.1
+urllib3==1.26.5
 Werkzeug==0.12.2
 xmltodict==0.11.0