diff --git a/setup.py b/setup.py
index e5af3e4b..55ef6398 100644
--- a/setup.py
+++ b/setup.py
@@ -12,7 +12,7 @@ long_description = f.read().strip()
 f.close()
 
 install_requires = [
-    'urllib3>=1.8, <2.0',
+    'urllib3<1.22,>=1.21.1',
 ]
 tests_require = [
     'requests>=2.0.0, <3.0.0',