diff --git a/pyproject.toml b/pyproject.toml
index 678dd12..a860925 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -89,7 +89,7 @@ dev-mypy = [
   "frequenz-client-dispatch[cli,dev-mkdocs,dev-noxfile,dev-pytest]",
   "grpc-stubs == 1.53.0.6",
   "types-protobuf == 6.32.1.20260221",
-  "types-python-dateutil == 2.9.0.20251115",
+  "types-python-dateutil == 2.9.0.20260402",
 ]
 dev-noxfile = ["nox == 2026.2.9", "frequenz-repo-config[lib] == 0.17.0"]
 dev-pylint = [