diff --git a/pyproject.toml b/pyproject.toml
index a3e4f62..520cec1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,3 +1,6 @@
+[project]
+requires-python = ">=3.12, <4"
+
 [tool.black]
 line-length = 88
 exclude = '''