diff --git a/setup.py b/setup.py
index c25d12aa..058181dc 100644
--- a/setup.py
+++ b/setup.py
@@ -43,6 +43,7 @@
     license="MIT license",
     zip_safe=False,
     keywords="cattrs",
+    python_requires="~=3.7",
     classifiers=[
         "Development Status :: 4 - Beta",
         "Intended Audience :: Developers",