diff --git a/pyproject.toml b/pyproject.toml
index 00cb2eb..7ca4f86 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,7 +13,7 @@ authors = [
 ]
 description = "Primary Gamma RADiation Landscape"
 readme = "README.md"
-requires-python = ">=3.12.4"
+requires-python = ">=3.12.4,<3.13"
 dependencies = [
     "matplotlib>=3.9.2",
     "numpy>=2",