diff --git a/django_celery_beat/apps.py b/django_celery_beat/apps.py
index 0a783d21..65084ef2 100644
--- a/django_celery_beat/apps.py
+++ b/django_celery_beat/apps.py
@@ -12,3 +12,7 @@ class BeatConfig(AppConfig):
     label = 'django_celery_beat'
     verbose_name = _('Periodic Tasks')
     default_auto_field = 'django.db.models.AutoField'
+
+    def ready(self):
+        from .signals import signals_connect
+        signals_connect()
diff --git a/django_celery_beat/models.py b/django_celery_beat/models.py
index 7cb8d0b4..7e01fbfe 100644
--- a/django_celery_beat/models.py
+++ b/django_celery_beat/models.py
@@ -11,7 +11,6 @@
 from django.core.exceptions import MultipleObjectsReturned, ValidationError
 from django.core.validators import MaxValueValidator, MinValueValidator
 from django.db import models
-from django.db.models import signals
 from django.utils.translation import gettext_lazy as _
 
 from . import managers, validators
@@ -586,6 +585,11 @@ def save(self, *args, **kwargs):
         self._clean_expires()
         self.validate_unique()
         super().save(*args, **kwargs)
+        PeriodicTasks.changed(self)
+
+    def delete(self, *args, **kwargs):
+        super().delete(*args, **kwargs)
+        PeriodicTasks.changed(self)
 
     def _clean_expires(self):
         if self.expire_seconds is not None and self.expires:
@@ -619,23 +623,3 @@ def schedule(self):
             return self.solar.schedule
         if self.clocked:
             return self.clocked.schedule
-
-
-signals.pre_delete.connect(PeriodicTasks.changed, sender=PeriodicTask)
-signals.pre_save.connect(PeriodicTasks.changed, sender=PeriodicTask)
-signals.pre_delete.connect(
-    PeriodicTasks.update_changed, sender=IntervalSchedule)
-signals.post_save.connect(
-    PeriodicTasks.update_changed, sender=IntervalSchedule)
-signals.post_delete.connect(
-    PeriodicTasks.update_changed, sender=CrontabSchedule)
-signals.post_save.connect(
-    PeriodicTasks.update_changed, sender=CrontabSchedule)
-signals.post_delete.connect(
-    PeriodicTasks.update_changed, sender=SolarSchedule)
-signals.post_save.connect(
-    PeriodicTasks.update_changed, sender=SolarSchedule)
-signals.post_delete.connect(
-    PeriodicTasks.update_changed, sender=ClockedSchedule)
-signals.post_save.connect(
-    PeriodicTasks.update_changed, sender=ClockedSchedule)
diff --git a/django_celery_beat/signals.py b/django_celery_beat/signals.py
new file mode 100644
index 00000000..9fd68a95
--- /dev/null
+++ b/django_celery_beat/signals.py
@@ -0,0 +1,48 @@
+def signals_connect():
+    """
+    Connect to signals.
+    """
+    from django.db.models import signals
+    from .models import (
+        ClockedSchedule,
+        PeriodicTask,
+        PeriodicTasks,
+        IntervalSchedule,
+        CrontabSchedule,
+        SolarSchedule
+    )
+
+    signals.pre_save.connect(
+        PeriodicTasks.changed, sender=PeriodicTask
+    )
+    signals.pre_delete.connect(
+        PeriodicTasks.changed, sender=PeriodicTask
+    )
+
+    signals.post_save.connect(
+        PeriodicTasks.update_changed, sender=IntervalSchedule
+    )
+    signals.pre_delete.connect(
+        PeriodicTasks.update_changed, sender=IntervalSchedule
+    )
+
+    signals.post_save.connect(
+        PeriodicTasks.update_changed, sender=CrontabSchedule
+    )
+    signals.post_delete.connect(
+        PeriodicTasks.update_changed, sender=CrontabSchedule
+    )
+
+    signals.post_save.connect(
+        PeriodicTasks.update_changed, sender=SolarSchedule
+    )
+    signals.post_delete.connect(
+        PeriodicTasks.update_changed, sender=SolarSchedule
+    )
+
+    signals.post_save.connect(
+        PeriodicTasks.update_changed, sender=ClockedSchedule
+    )
+    signals.post_delete.connect(
+        PeriodicTasks.update_changed, sender=ClockedSchedule
+    )
diff --git a/t/proj/migrations/0001_initial.py b/t/proj/migrations/0001_initial.py
new file mode 100644
index 00000000..d157fe81
--- /dev/null
+++ b/t/proj/migrations/0001_initial.py
@@ -0,0 +1,23 @@
+# Generated by Django 4.0.7 on 2022-10-13 05:09
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        ('django_celery_beat', '0016_alter_crontabschedule_timezone'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='O2OToPeriodicTasks',
+            fields=[
+                ('periodictask_ptr', models.OneToOneField(auto_created=True, on_delete=django.db.models.deletion.CASCADE, parent_link=True, primary_key=True, serialize=False, to='django_celery_beat.periodictask')),
+            ],
+            bases=('django_celery_beat.periodictask',),
+        ),
+    ]
diff --git a/t/proj/migrations/__init__.py b/t/proj/migrations/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/t/proj/models.py b/t/proj/models.py
new file mode 100644
index 00000000..597c46eb
--- /dev/null
+++ b/t/proj/models.py
@@ -0,0 +1,8 @@
+from django_celery_beat.models import PeriodicTask
+
+
+class O2OToPeriodicTasks(PeriodicTask):
+    """
+    The test-case model of OneToOne relation.
+    """
+    pass
diff --git a/t/proj/settings.py b/t/proj/settings.py
index a09c4e33..abf8f4f4 100644
--- a/t/proj/settings.py
+++ b/t/proj/settings.py
@@ -48,6 +48,7 @@
     'django.contrib.messages',
     'django.contrib.staticfiles',
     'django_celery_beat',
+    't.proj',
 ]
 
 MIDDLEWARE = [
@@ -79,7 +80,6 @@
 
 WSGI_APPLICATION = 't.proj.wsgi.application'
 
-
 # Database
 # https://docs.djangoproject.com/en/1.9/ref/settings/#databases
 
@@ -93,7 +93,6 @@
     }
 }
 
-
 # Password validation
 # https://docs.djangoproject.com/en/1.9/ref/settings/#auth-password-validators
 
@@ -102,7 +101,6 @@
 AUTH_PASSWORD_VALIDATORS = [
 ]
 
-
 # Internationalization
 # https://docs.djangoproject.com/en/1.9/topics/i18n/
 
@@ -116,7 +114,6 @@
 
 USE_TZ = True
 
-
 # Static files (CSS, JavaScript, Images)
 # https://docs.djangoproject.com/en/1.9/howto/static-files/
 
diff --git a/t/unit/test_models.py b/t/unit/test_models.py
index fd592ade..e975f9bc 100644
--- a/t/unit/test_models.py
+++ b/t/unit/test_models.py
@@ -1,10 +1,13 @@
 import datetime
 import os
+
 try:
     from zoneinfo import available_timezones, ZoneInfo
 except ImportError:
     from backports.zoneinfo import available_timezones, ZoneInfo
 
+import pytest
+
 from celery import schedules
 from django.test import TestCase, override_settings
 from django.apps import apps
@@ -22,7 +25,10 @@
     CrontabSchedule,
     ClockedSchedule,
     IntervalSchedule,
+    PeriodicTasks,
+    DAYS,
 )
+from t.proj.models import O2OToPeriodicTasks
 
 
 class MigrationTests(TestCase):
@@ -159,3 +165,51 @@ def test_timezone_format(self):
             clocked_time=tz_info)
         # testnig str(schedule) calls make_aware() internally
         assert str(schedule.clocked_time) == str(schedule)
+
+
+@pytest.mark.django_db()
+class OneToOneRelTestCase(TestCase):
+    """
+    Make sure that when OneToOne relation Model changed,
+    the `PeriodicTasks.last_update` will be update.
+    """
+
+    @classmethod
+    def setUpTestData(cls):
+        super().setUpTestData()
+        cls.interval_schedule = IntervalSchedule.objects.create(
+            every=10, period=DAYS
+        )
+
+    def test_trigger_update_when_saved(self):
+        o2o_to_periodic_tasks = O2OToPeriodicTasks.objects.create(
+            name='name1',
+            task='task1',
+            enabled=True,
+            interval=self.interval_schedule
+        )
+        not_changed_dt = PeriodicTasks.last_change()
+        o2o_to_periodic_tasks.enabled = True  # Change something on instance.
+        o2o_to_periodic_tasks.save()
+        has_changed_dt = PeriodicTasks.last_change()
+        self.assertTrue(
+            not_changed_dt != has_changed_dt,
+            'The `PeriodicTasks.last_update` has not be update.'
+        )
+        # Check the `PeriodicTasks` does be updated.
+
+    def test_trigger_update_when_deleted(self):
+        o2o_to_periodic_tasks = O2OToPeriodicTasks.objects.create(
+            name='name1',
+            task='task1',
+            enabled=True,
+            interval=self.interval_schedule
+        )
+        not_changed_dt = PeriodicTasks.last_change()
+        o2o_to_periodic_tasks.delete()
+        has_changed_dt = PeriodicTasks.last_change()
+        self.assertTrue(
+            not_changed_dt != has_changed_dt,
+            'The `PeriodicTasks.last_update` has not be update.'
+        )
+        # Check the `PeriodicTasks` does be updated.