diff --git a/setup.py b/setup.py
index f3b209b336914afc34176b374babee32a2b1ab9f..54aa5988d93b31bffc1387863b6b9f179c241be0 100644
--- a/setup.py
+++ b/setup.py
@@ -220,6 +220,7 @@ def main():
         maintainer="Olli-Pekka Heinisuo",
         ext_modules=EmptyListWithLength(),
         install_requires=numpy_version,
+        python_requires=">=3.5",
         classifiers=[
             "Development Status :: 5 - Production/Stable",
             "Environment :: Console",