diff --git a/setup.py b/setup.py
index 1f12a0b64..bc6efe6ca 100644
--- a/setup.py
+++ b/setup.py
@@ -18,6 +18,7 @@ setup(
     packages=find_packages(),
     include_package_data=True,
     install_requires=requirements,
+    python_requires='>=3.9',
     entry_points={
         "console_scripts": [
             "aider = aider.main:main",