diff --git a/setup.py b/setup.py
index 884308c..afe63d0 100644
--- a/setup.py
+++ b/setup.py
@@ -100,6 +100,7 @@ def select_constraint(default, nightly=None, git_master=None):
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3 :: Only',
         'Topic :: Scientific/Engineering',
         'Topic :: Scientific/Engineering :: Artificial Intelligence',