diff --git a/Projectfile b/Projectfile
index 938f3d9..ff876a0 100644
--- a/Projectfile
+++ b/Projectfile
@@ -10,6 +10,7 @@ yapf = require('yapf')
 
 python.setup(
     name='bonobo',
+    python_requires='>=3.5',
     description='Bonobo, a simple, modern and atomic extract-transform-load toolkit for python 3.5+.',
     license='Apache License, Version 2.0',
     url='https://www.bonobo-project.org/',
diff --git a/setup.py b/setup.py
index b5334d2..75a84cc 100644
--- a/setup.py
+++ b/setup.py
@@ -54,6 +54,7 @@ setup(
                  'python 3.5+.'),
     license='Apache License, Version 2.0',
     name='bonobo',
+    python_requires='>=3.5',
     version=version,
     long_description=long_description,
     classifiers=classifiers,