diff --git a/setup.py b/setup.py
index 80df309..70ea551 100644
--- a/setup.py
+++ b/setup.py
@@ -38,7 +38,7 @@
     "asn1crypto>=0.21.0",
     "packaging",
     "six>=1.4.1",
-    "setuptools>=11.3",
+    "setuptools>=20.5",
 ]
 setup_requirements = []