1 files changed, 1 insertions, 0 deletions
diff --git a/setup.py b/setup.py
index 0a02ab9..b54270d 100644
--- a/setup.py
+++ b/setup.py
@@ -50,6 +50,7 @@ setuptools.setup(
     version=VERSION,
     description='Immutable Collections',
     long_description=readme,
+    python_requires='>=3.5',
     classifiers=[
         'License :: OSI Approved :: Apache Software License',
         'Intended Audience :: Developers',