diff --git a/pyproject.toml b/pyproject.toml
index ef618db..1c68e6c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -2,6 +2,7 @@
 requires = [
     "hatchling>=1.27.0",
 ]
+requires_python = ">=3.9,<3.14"
 build-backend = "hatchling.build"
 
 [project]