diff --git a/setup.py b/setup.py
index ee94f4692..b92d512b2 100644
--- a/setup.py
+++ b/setup.py
@@ -36,6 +36,7 @@ setup(
         "Programming Language :: Python :: 3 :: Only",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: Implementation :: CPython",
         "Topic :: Security",
         "Topic :: Internet :: WWW/HTTP",