diff --git a/setup.py b/setup.py
index 8bb2944..486e1ab 100644
--- a/setup.py
+++ b/setup.py
@@ -18,7 +18,7 @@ install_requires = [
     'six>=1.10',
     'pycryptodomex>=3.7.0',
     'requests>=2.9.1,<2.22.0',
-    'vdf>=2.0',
+    'vdf>=3.3',
     'gevent>=1.3.0',
     'protobuf>=3.0.0',
     'gevent-eventemitter>=2.1',