diff --git a/python/pyproject.toml b/python/pyproject.toml
index be9bedbe28..0460a4d3ff 100644
--- a/python/pyproject.toml
+++ b/python/pyproject.toml
@@ -464,5 +464,5 @@ explicit = true
 name = "agent_framework_meta"
 
 [build-system]
-requires = ["flit-core >= 3.11,<4.0"]
+requires = ["flit-core >= 3.11,< 5.0"]
 build-backend = "flit_core.buildapi"