diff --git a/setup.py b/setup.py
index e2fecdcc..f9efbdac 100644
--- a/setup.py
+++ b/setup.py
@@ -164,6 +164,7 @@ def select_constraint(default, nightly=None, git_master=None):
         'Programming Language :: Python :: 3',
         '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',