diff --git a/pyproject.toml b/pyproject.toml
index 708bacb5..a2ea95a5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -155,5 +155,5 @@ known-first-party = ["mex", "tests"]
 convention = "google"
 
 [build-system]
-requires = ["pdm-backend==2.4.1"]
+requires = ["pdm-backend==2.4.2"]
 build-backend = "pdm.backend"