diff --git a/setup.cfg b/setup.cfg
index 3e6b164e..ccefec6c 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -17,6 +17,7 @@ classifier =
     Operating System :: Microsoft :: Windows
     Programming Language :: Python
     Programming Language :: Python :: 3
+    Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
     Programming Language :: Python :: 3.11