diff --git a/setup.cfg b/setup.cfg
index 97ac662e4..30772d2e5 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -21,6 +21,7 @@ classifier =
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.9
     Topic :: Internet :: Name Service (DNS)
 
 [files]