diff --git a/pyproject.toml b/pyproject.toml
index 5e300b46b..2ee4633aa 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -300,7 +300,7 @@ dev = [
     "freezegun==1.2.2",
     "furo==2023.8.19",
     "mypy==1.5.1",
-    "pdm==2.8.2",
+    "pdm==2.9.0",
     "pip_check_reqs==2.4.4",
     "pydocstyle==6.3.0",
     "pyenchant==3.2.2",