diff --git a/HISTORY.rst b/HISTORY.rst
index f027a8d..58ae4fa 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -2,6 +2,11 @@
 History
 =======
 
+not released yet
+----------------
+
+* Add ``PYNOTIFY_RECIPIENT_MODEL`` config option
+
 0.4.1 (2020-10-12)
 ------------------
 
diff --git a/docs/configuration.rst b/docs/configuration.rst
index c8453ba..29760da 100644
--- a/docs/configuration.rst
+++ b/docs/configuration.rst
@@ -25,6 +25,11 @@ You can configure the library in Django settings. Following options are availabl
 
     Import path to a receiver class.
 
+* ``PYNOTIFY_RECIPIENT_MODEL`` (default: ``settings.AUTH_USER_MODEL``)
+
+    Model used for recipient's foreign key on ``Notification`` model. Please note, that if you change this setting after
+    initial migration has been aplied, you might need to migrate the model manually.
+
 * ``PYNOTIFY_RELATED_OBJECTS_ALLOWED_ATTRIBUTES`` (default: ``{'get_absolute_url', }``)
 
     A set of related object's attributes that can be used in notification template(s).
diff --git a/pynotify/config.py b/pynotify/config.py
index 1a9ee53..f2c1e7e 100644
--- a/pynotify/config.py
+++ b/pynotify/config.py
@@ -11,6 +11,7 @@ class Settings:
         'CELERY_TASK': 'pynotify.tasks.notification_task',
         'ENABLED': True,
         'RECEIVER': 'pynotify.receivers.SynchronousReceiver',
+        'RECIPIENT_MODEL': django_settings.AUTH_USER_MODEL,
         'RELATED_OBJECTS_ALLOWED_ATTRIBUTES': {'get_absolute_url', },
         'STRIP_HTML': False,
         'TEMPLATE_CHECK': False,
diff --git a/pynotify/migrations/0001_initial.py b/pynotify/migrations/0001_initial.py
index 93d5f60..47e91ba 100644
--- a/pynotify/migrations/0001_initial.py
+++ b/pynotify/migrations/0001_initial.py
@@ -1,16 +1,17 @@
 # Generated by Django 2.2rc1 on 2019-03-20 11:24
 
-from django.conf import settings
 from django.db import migrations, models
 import django.db.models.deletion
 
+from pynotify.config import settings
+
 
 class Migration(migrations.Migration):
 
     initial = True
 
     dependencies = [
-        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        migrations.swappable_dependency(settings.RECIPIENT_MODEL),
         ('contenttypes', '0002_remove_content_type_name'),
     ]
 
@@ -24,7 +25,7 @@ class Migration(migrations.Migration):
                 ('is_read', models.BooleanField(default=False, verbose_name='is read')),
                 ('is_triggered', models.BooleanField(default=False, verbose_name='is triggered')),
                 ('recipient', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE,
-                                                related_name='notifications', to=settings.AUTH_USER_MODEL,
+                                                related_name='notifications', to=settings.RECIPIENT_MODEL,
                                                 verbose_name='recipient')),
             ],
             options={
diff --git a/pynotify/models.py b/pynotify/models.py
index d87686b..7fd80db 100644
--- a/pynotify/models.py
+++ b/pynotify/models.py
@@ -2,7 +2,6 @@
 import re
 
 from chamber.models import SmartModel, SmartModelBase, SmartQuerySet
-from django.conf import settings as django_settings
 from django.contrib.contenttypes.fields import GenericForeignKey
 from django.contrib.contenttypes.models import ContentType
 from django.core.serializers.json import DjangoJSONEncoder
@@ -187,7 +186,7 @@ class Notification(BaseModel, metaclass=NotificationMeta):
         extra_data: JSON serialized dictionary with extra data.
     """
     recipient = models.ForeignKey(
-        django_settings.AUTH_USER_MODEL,
+        settings.RECIPIENT_MODEL,
         related_name='notifications',
         on_delete=models.CASCADE,
         verbose_name=_l('recipient'),
diff --git a/requirements_docs.txt b/requirements_docs.txt
index 302c3b5..cfbdcbb 100644
--- a/requirements_docs.txt
+++ b/requirements_docs.txt
@@ -1,4 +1,6 @@
 -r requirements_dev.txt
-django>=2.2
-celery>=4.2.0
-django-chamber>=0.5.0
+beautifulsoup4==4.*
+celery==4.*
+django-chamber==0.*
+django==2.*
+lxml==4.*
diff --git a/setup.py b/setup.py
index 10118ac..3106087 100644
--- a/setup.py
+++ b/setup.py
@@ -11,12 +11,13 @@
 with open('HISTORY.rst') as history_file:
     history = history_file.read()
 
+# keep in sync with requirements_docs.txt
 requirements = [
-    'beautifulsoup4 ~=4.8.0',
-    'celery >= 4.2.0',
-    'django >= 2.2',
-    'django-chamber ~= 0.5.0',
-    'lxml ~= 4.5.0',
+    'beautifulsoup4==4.*',
+    'celery==4.*',
+    'django==2.*',
+    'django-chamber==0.*',
+    'lxml==4.*',
 ]
 
 setup(