diff --git a/setup.py b/setup.py
index c2e4c1a..13b5824 100644
--- a/setup.py
+++ b/setup.py
@@ -51,4 +51,5 @@ setuptools.setup(name="packtml",
                  include_package_data=True,
                  install_requires=REQUIREMENTS,
                  package_data={"packtml": ["*"]},
+                 python_requires='>=3.5, <4',
                  version=VERSION)