diff --git a/requirements_dev.txt b/requirements_dev.txt
index ae88e48..d3b4d09 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -40,7 +40,7 @@ sphinxcontrib-websupport==1.0.1
 tox==2.9.1
 tqdm==4.19.9
 twine==1.10.0
-urllib3==1.24.2
+urllib3==1.26.5
 virtualenv==15.2.0; python_version != '3.2'
 watchdog==0.8.3
 wrapt==1.10.11