diff --git a/setup.py b/setup.py
index d41c943d..905781c5 100644
--- a/setup.py
+++ b/setup.py
@@ -23,6 +23,7 @@ setup(
     packages=find_packages(exclude=['tests', 'tests.*']),
     zip_safe=False,
     include_package_data=True,
+    python_requires='>= 2.7, < 3',
     install_requires=[
         'Pykka >= 1.1',
         'requests >= 2.0',