diff --git a/pyproject.toml b/pyproject.toml
index 44d275b..2445d7a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,6 +18,7 @@ classifiers = [
   "License :: OSI Approved :: MIT License",
   "Programming Language :: Python :: 3.7",
   "Programming Language :: Python :: 3.8",
+  "Programming Language :: Python :: 3.9",
   "Topic :: Software Development :: Libraries :: Python Modules",
   "Topic :: System :: Systems Administration :: Authentication/Directory"
 ]