diff --git a/README.md b/README.md
index f728e9f..369120e 100644
--- a/README.md
+++ b/README.md
@@ -110,11 +110,11 @@ The monitor's slug will be the actor's name. Like `my_task` in the example above
 Certain triggers are not supported by Sentry as well as sub-minute intervals.
 In these cases, no monitor will be created and no telemetry will be sent.
 
-Pass a custom config via `sentry_monitor_config` or set it to `False`
+Pass a custom config via `sentry_monitor_config` or set it to `None`
 to disable Sentry monitoring for a single task:
 
 ```python
-@cron("* * * * *", sentry_monitor_config=False)
+@cron("* * * * *", sentry_monitor_config=None)
 @task
 def my_task_without_sentry(): ...
 ```
diff --git a/crontask/__init__.py b/crontask/__init__.py
index d3eab36..7052443 100644
--- a/crontask/__init__.py
+++ b/crontask/__init__.py
@@ -34,12 +34,13 @@ def add_job(self, *args, **kwargs):
 
 
 scheduler = LazyBlockingScheduler()
+UNSET = object()
 
 
 def cron(
     schedule: str | BaseTrigger,
     *,
-    sentry_monitor_config: dict[str, typing.Any] | bool | None = None,
+    sentry_monitor_config: dict[str, dict[str, str | int] | str] | None = UNSET,
 ) -> typing.Callable[[Task], Task]:
     """
     Run task on a scheduler with a cron schedule.
@@ -52,7 +53,7 @@ def cron_test():
 
     Args:
         schedule: A cron schedule string or an APScheduler trigger.
-        sentry_monitor_config: A Sentry monitor configuration dict or False to disable monitoring.
+        sentry_monitor_config: A Sentry monitor configuration dict or None to disable monitoring.
 
     """
 
@@ -73,11 +74,13 @@ def decorator(task: Task) -> Task:
         else:
             trigger = schedule
 
-        if sentry_monitor_config is not False:
+        if sentry_monitor_config is not None:
             task = sentry.monitor_cron_task(
                 task,
                 trigger,
-                sentry_monitor_config=sentry_monitor_config,
+                sentry_monitor_config={}
+                if sentry_monitor_config is UNSET
+                else sentry_monitor_config,
             )
 
         scheduler.add_job(
diff --git a/crontask/contrib/sentry.py b/crontask/contrib/sentry.py
index a1da310..a8dc326 100644
--- a/crontask/contrib/sentry.py
+++ b/crontask/contrib/sentry.py
@@ -65,7 +65,7 @@ def trigger_to_monitor_config(
 def monitor_cron_task(
     task: Task,
     trigger: BaseTrigger,
-    sentry_monitor_config: dict[str, dict[str, str | int] | str] | None = None,
+    sentry_monitor_config: dict[str, dict[str, str | int] | str],
 ) -> Task:
     """
     Wrap the task function in a Sentry monitor for a suitable trigger.
diff --git a/tests/test_tasks.py b/tests/test_tasks.py
index b4bd775..398a62c 100644
--- a/tests/test_tasks.py
+++ b/tests/test_tasks.py
@@ -128,7 +128,7 @@ def test_cron__sentry_monitor_config_false(monkeypatch):
     mock_monitor = Mock(return_value=tasks.heartbeat)
     monkeypatch.setattr("crontask.sentry.monitor_cron_task", mock_monitor)
 
-    cron("* * * * *", sentry_monitor_config=False)(tasks.heartbeat)
+    cron("* * * * *", sentry_monitor_config=None)(tasks.heartbeat)
 
     mock_monitor.assert_not_called()
     assert len(scheduler.get_jobs()) == 1
@@ -166,4 +166,4 @@ def test_cron__sentry_monitor_config_none(monkeypatch):
 
     mock_monitor.assert_called_once()
     call_args = mock_monitor.call_args
-    assert call_args.kwargs["sentry_monitor_config"] is None
+    assert call_args.kwargs["sentry_monitor_config"] == {}