diff --git a/pyproject.toml b/pyproject.toml
index f831d9f..524211b 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 == 7.34.1.20260408",
-  "types-python-dateutil == 2.9.0.20251115",
+  "types-python-dateutil == 2.9.0.20260408",
 ]
 dev-noxfile = ["nox == 2026.4.10", "frequenz-repo-config[lib] == 0.17.0"]
 dev-pylint = [
diff --git a/src/frequenz/client/dispatch/types.py b/src/frequenz/client/dispatch/types.py
index d06586c..af9a3c2 100644
--- a/src/frequenz/client/dispatch/types.py
+++ b/src/frequenz/client/dispatch/types.py
@@ -6,7 +6,7 @@
 from dataclasses import dataclass
 from datetime import datetime, timedelta, timezone
 from enum import Enum
-from typing import Any, Self, SupportsInt, TypeAlias, cast, final
+from typing import Any, Self, SupportsInt, TypeAlias, final
 
 # pylint: enable=no-name-in-module
 from frequenz.api.common.v1alpha8.microgrid.electrical_components.electrical_components_pb2 import (
@@ -540,12 +540,9 @@ def next_run_after(self, after: datetime) -> datetime | None:
             return None
 
         # No type information for rrule, so we need to cast
-        return cast(
-            datetime | None,
-            self.recurrence._as_rrule(  # pylint: disable=protected-access
-                self.start_time
-            ).after(after, inc=True),
-        )
+        return self.recurrence._as_rrule(  # pylint: disable=protected-access
+            self.start_time
+        ).after(after, inc=True)
 
     def _until(self, now: datetime) -> datetime | None:
         """Calculate the time when the dispatch should end.