diff --git a/setup.py b/setup.py
index 819ec9c..94b7ffa 100644
--- a/setup.py
+++ b/setup.py
@@ -40,6 +40,7 @@
         'Programming Language :: Python :: Implementation :: PyPy'
     ),
 
+    python_requires='>=3.5',
     install_requires=('appdirs', 'click', 'google-cloud-bigquery', 'tinydb', 'tinyrecord'),
     tests_require=['pytest'],