diff --git a/tox.ini b/tox.ini
index 8d033367b..4598ad3d3 100644
--- a/tox.ini
+++ b/tox.ini
@@ -10,6 +10,7 @@ deps =
   pytest >= 4.6.3, < 5.0
   pyyaml >= 5.1.2, < 6.0
   flake8 >= 3.7.9, < 3.8
+  urllib3
 commands =
     pytest {posargs}