diff --git a/pyproject.toml b/pyproject.toml
index 59aceef..50a52e4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,7 +7,7 @@ authors = [
 ]
 license = {text = "MIT"}
 readme = "README.md"
-requires-python = ">=3.10"
+requires-python = ">=3.10,<4.0"
 dependencies = [
 ]