diff --git a/setup.cfg b/setup.cfg
index 8fb10cb..beaf9b4 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -16,6 +16,7 @@
     Programming Language :: Python
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
     Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: Implementation :: CPython