diff --git a/setup.py b/setup.py
index adbcd37..b89b39a 100755
--- a/setup.py
+++ b/setup.py
@@ -55,6 +55,7 @@ setup(
             'python-magic',
         ],
     },
+    python_requires=">=3.5",
     classifiers=[
         'Development Status :: 4 - Beta',
         'Environment :: Web Environment',