diff --git a/setup.py b/setup.py
index 287f98c..616aad9 100644
--- a/setup.py
+++ b/setup.py
@@ -16,6 +16,6 @@ setuptools.setup(name='umbra',
             'Development Status :: 3 - Alpha Development Status',
             'Environment :: Console',
             'License :: OSI Approved :: Apache Software License',
-            'Programming Language :: Python :: 3',
+            'Programming Language :: Python :: 3.3',
             'Topic :: System :: Archiving',
         ])