diff --git a/setup.cfg b/setup.cfg
index c4d2fd9..22c950f 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -20,6 +20,7 @@ classifiers =
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.9
     Topic :: Communications
     Topic :: Internet
     Topic :: Software Development