diff --git a/requirements.txt b/requirements.txt
index 078df9e0..d4258c10 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,4 +2,4 @@ certifi>=2018.4.16
 expiringdict>=1.1.4
 pyRFC3339>=1.0
 semver>=2.10.2,<3.0.0
-urllib3>=1.22.0
+urllib3>=1.22.0,<2.0.0