diff --git a/pyproject.toml b/pyproject.toml
index f8a0e82a..b972d608 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -88,7 +88,7 @@ dev-mypy = [
   "frequenz-client-dispatch[cli,dev-mkdocs,dev-noxfile,dev-pytest]",
   "grpc-stubs == 1.53.0.6",
   "types-protobuf == 6.30.2.20250703",
-  "types-python-dateutil == 2.9.0.20250708",
+  "types-python-dateutil == 2.9.0.20250822",
 ]
 dev-noxfile = ["nox == 2025.5.1", "frequenz-repo-config[lib] == 0.13.5"]
 dev-pylint = [