diff --git a/custom_components/nestquest/__init__.py b/custom_components/nestquest/__init__.py
index 310a2a6..7802707 100644
--- a/custom_components/nestquest/__init__.py
+++ b/custom_components/nestquest/__init__.py
@@ -298,7 +298,7 @@ def _register_day_rollover_listener(
         await _materialize_run(database, start_date, end_date)
 
     return async_track_time_change(
-        hass, _run_materialization, hour=hour, minute=minute, local=True
+        hass, _run_materialization, hour=hour, minute=minute
     )
 
 
diff --git a/tests/conftest.py b/tests/conftest.py
index 42e4512..ff8c5d6 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -248,7 +248,7 @@ class TimeChangeRegistry:
     """Models HA's time-change listener bookkeeping.
 
     ``track`` mirrors ``homeassistant.helpers.event.async_track_time_change``:
-    each call appends a record (action + hour/minute/second/local) and returns
+    each call appends a record (action + hour/minute/second) and returns
     a remove callable that reverses the registration.  Tests inspect
     ``registrations`` and exercise the newest action through :meth:`fire`.
     """
@@ -257,13 +257,12 @@ class TimeChangeRegistry:
         self._hass = hass
         self._registrations: list[dict] = []
 
-    def track(self, action, hour=None, minute=None, second=None, local=False):
+    def track(self, action, hour=None, minute=None, second=None):
         record = {
             "action": action,
             "hour": hour,
             "minute": minute,
             "second": second,
-            "local": local,
         }
 
         def _remove():
@@ -290,17 +289,19 @@ class TimeChangeRegistry:
             await result
 
 
-def _async_track_time_change(hass, action, hour=None, minute=None, second=None, local=False):
+def _async_track_time_change(hass, action, hour=None, minute=None, second=None):
     """Mirror homeassistant.helpers.event.async_track_time_change.
 
-    Routes to the registry attached to ``hass`` (created on demand), so
-    tests reach the registrations via ``hass.time_change``.
+    Exact HA 2024.6 signature — no ``local`` keyword: the local-time
+    wrapper is already this function.  Routes to the registry attached to
+    ``hass`` (created on demand), so tests reach the registrations via
+    ``hass.time_change``.
     """
     registry = getattr(hass, "time_change", None)
     if registry is None:
         registry = TimeChangeRegistry(hass)
         hass.time_change = registry
-    return registry.track(action, hour=hour, minute=minute, second=second, local=local)
+    return registry.track(action, hour=hour, minute=minute, second=second)
 
 
 _ha_mock("homeassistant.helpers.event").async_track_time_change = _async_track_time_change
diff --git a/tests/test_lifecycle.py b/tests/test_lifecycle.py
index 3516310..0acb96e 100644
--- a/tests/test_lifecycle.py
+++ b/tests/test_lifecycle.py
@@ -251,7 +251,6 @@ async def test_setup_registers_day_rollover_listener(hass, make_entry) -> None:
     registration = hass.time_change.registrations[0]
     assert registration["hour"] == 0
     assert registration["minute"] == 0
-    assert registration["local"] is True
     assert callable(entry.runtime_data.remove_time_change_listener)
 
 
@@ -322,6 +321,23 @@ async def test_day_rollover_listener_materializes_ha_local_horizon(
     fake.assert_awaited_once_with(database, expected_start, expected_end)
 
 
+def test_day_rollover_time_change_tracker_rejects_local_kwarg() -> None:
+    """The fake async_track_time_change mirrors HA 2024.6 (no ``local`` kwarg).
+
+    Setup drives the local-time wrapper directly, so passing ``local=`` must
+    raise TypeError — otherwise a regression in the production call would be
+    silently masked by the fake.
+    """
+    import inspect as _inspect
+
+    from homeassistant.helpers.event import async_track_time_change
+
+    params = _inspect.signature(async_track_time_change).parameters
+    assert list(params) == ["hass", "action", "hour", "minute", "second"]
+    with pytest.raises(TypeError):
+        async_track_time_change(None, lambda _now: None, hour=0, minute=0, local=True)
+
+
 async def test_setup_applies_all_v1_tables(hass, make_entry) -> None:
     """Setup applies the full v1 DDL: all four v1 tables exist afterwards."""
     entry = _wire(make_entry(), hass.registry)