diff --git a/pyproject.toml b/pyproject.toml
index f01c346..5528b27 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,7 +5,7 @@ build-backend = "setuptools.build_meta"
 [project]
 name = "xdas"
 version = "0.2.1"
-requires-python = ">= 3.10"
+requires-python = ">= 3.10,<3.13"
 authors = [
     { name = "Alister Trabattoni", email = "alister.trabattoni@gmail.com" },
 ]