diff --git a/setup.py b/setup.py
index fcf910e5a..55ee618c5 100644
--- a/setup.py
+++ b/setup.py
@@ -41,6 +41,7 @@
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
+        "Programming Language :: Python :: 3.10",
     ],
     project_urls={
         "Tracker": "https://github.com/stac-utils/pystac/issues",