diff --git a/setup.py b/setup.py
index 490dd44..0e55d2e 100644
--- a/setup.py
+++ b/setup.py
@@ -231,6 +231,7 @@ setup(
         'Programming Language :: Cython',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: Implementation :: PyPy',
         'Topic :: Communications'],
 )