diff --git a/access_controller/settings.py b/access_controller/settings.py
index 60367a3..37a7e63 100644
--- a/access_controller/settings.py
+++ b/access_controller/settings.py
@@ -24,7 +24,7 @@ BASE_DIR = Path(__file__).resolve().parent.parent
 SECRET_KEY = os.getenv('ACTRL_SECRET_KEY', 'empty')
 
 # SECURITY WARNING: don't run with debug turned on in production!
-DEBUG = bool(int(os.getenv('ACTRL_DEBUG', 1)))
+DEBUG = bool(int(os.getenv('ACTRL_DEBUG', '1')))
 
 ALLOWED_HOSTS = [
     '127.0.0.1',
@@ -60,8 +60,8 @@ ROOT_URLCONF = 'access_controller.urls'
 
 EMAIL_BACKEND = 'django.core.mail.backends.smtp.EmailBackend'
 EMAIL_HOST = os.getenv('ACTRL_EMAIL_HOST', 'smtp.gmail.com')
-EMAIL_PORT = int(os.getenv('ACTRL_EMAIL_PORT', 587))
-EMAIL_USE_TLS = bool(int(os.getenv('ACTRL_EMAIL_TLS', 1)))
+EMAIL_PORT = int(os.getenv('ACTRL_EMAIL_PORT', '587'))
+EMAIL_USE_TLS = bool(int(os.getenv('ACTRL_EMAIL_TLS', '1')))
 EMAIL_HOST_USER = os.getenv('ACTRL_EMAIL_HOST_USER', 'group02django@gmail.com')
 EMAIL_HOST_PASSWORD = os.getenv('ACTRL_EMAIL_HOST_PASSWORD', 'djangogroup02')
 DEFAULT_FROM_EMAIL = os.getenv('ACTRL_FROM_EMAIL', EMAIL_HOST_USER)
@@ -154,8 +154,8 @@ AUTHENTICATION_BACKENDS = [
 
 
 ZENDESK_ROLES = {
-    'engineer': int(os.getenv('ENG_CROLE_ID', 0)),
-    'light_agent': int(os.getenv('LA_CROLE_ID', 0)),
+    'engineer': int(os.getenv('ENG_CROLE_ID', '0')),
+    'light_agent': int(os.getenv('LA_CROLE_ID', '0')),
 }
 
 ZENDESK_GROUPS = {
@@ -165,7 +165,7 @@ ZENDESK_GROUPS = {
 
 SOLVED_TICKETS_EMAIL = os.getenv('ST_EMAIL')
 
-ZENDESK_MAX_AGENTS = int(os.getenv('LICENSE_NO', 0))
+ZENDESK_MAX_AGENTS = int(os.getenv('LICENSE_NO', '0'))
 
 REST_FRAMEWORK = {
     # Use Django's standard `django.contrib.auth` permissions,
@@ -175,7 +175,7 @@ REST_FRAMEWORK = {
     ]
 }
 
-ONE_DAY = int(os.getenv('SHIFTH', 0))  # Количество часов в 1 рабочем дне
+ONE_DAY = int(os.getenv('SHIFTH', '0'))  # Количество часов в 1 рабочем дне
 
 ACTRL_ZENDESK_SUBDOMAIN = os.getenv('ACTRL_ZENDESK_SUBDOMAIN') or os.getenv('ZD_DOMAIN')
 ACTRL_API_EMAIL = os.getenv('ACTRL_API_EMAIL') or os.getenv('ACCESS_CONTROLLER_API_EMAIL')
diff --git a/main/extra_func.py b/main/extra_func.py
index 4c4b9c9..3c796be 100644
--- a/main/extra_func.py
+++ b/main/extra_func.py
@@ -5,7 +5,7 @@ import logging
 from datetime import timedelta, datetime, date
 from typing import Optional, Union
 
-from django.contrib.auth.models import User
+from django.contrib.auth import get_user_model
 from django.core.exceptions import ObjectDoesNotExist
 from django.core.handlers.wsgi import WSGIRequest
 from django.http import HttpResponseRedirect, HttpResponsePermanentRedirect
@@ -21,7 +21,7 @@ from main.models import UserProfile, RoleChangeLogs, UnassignedTicket, Unassigne
 from main.zendesk_admin import zenpy
 
 
-def update_role(user_profile: UserProfile, role: int, who_changes: User) -> None:
+def update_role(user_profile: UserProfile, role: int, who_changes: get_user_model()) -> None:
     """
     Функция меняет роль пользователя.
 
@@ -39,7 +39,7 @@ def update_role(user_profile: UserProfile, role: int, who_changes: User) -> None
     zendesk.admin.users.update(user)
 
 
-def make_engineer(user_profile: UserProfile, who_changes: User) -> None:
+def make_engineer(user_profile: UserProfile, who_changes: get_user_model()) -> None:
     """
     Функция устанавливает пользователю роль инженера.
 
@@ -49,7 +49,7 @@ def make_engineer(user_profile: UserProfile, who_changes: User) -> None:
     update_role(user_profile, ROLES['engineer'], who_changes)
 
 
-def make_light_agent(user_profile: UserProfile, who_changes: User) -> None:
+def make_light_agent(user_profile: UserProfile, who_changes: get_user_model()) -> None:
     """
     Функция устанавливает пользователю роль легкого агента.
 
@@ -193,7 +193,7 @@ def update_users_in_model():
     users = get_users_list()
     for user in users:
         try:
-            profile = User.objects.get(email=user.email).userprofile
+            profile = get_user_model().objects.get(email=user.email).userprofile
             update_user_in_model(profile, user)
         except ObjectDoesNotExist:
             pass
@@ -409,9 +409,9 @@ class StatisticData:
         try:
             self.data = RoleChangeLogs.objects.filter(
                 change_time__range=[self.start_date, self.end_date + timedelta(days=1)],
-                user=User.objects.get(email=self.email),
+                user=get_user_model().objects.get(email=self.email),
             ).order_by('change_time')
-        except User.DoesNotExist:
+        except get_user_model().DoesNotExist:
             self.errors += ['Пользователь не найден']
 
     def _init_statistic(self) -> None:
@@ -475,7 +475,7 @@ class StatisticData:
 
         :param first_log: Первый лог
         """
-        self.fill_daterange(max(User.objects.get(email=self.email).date_joined.date(), self.start_date),
+        self.fill_daterange(max(get_user_model().objects.get(email=self.email).date_joined.date(), self.start_date),
                             first_log.change_time.date())
         self.statistic[first_log.change_time.date()] += get_timedelta(first_log).total_seconds()
 
@@ -564,7 +564,7 @@ class CsvFormatter(logging.Formatter):
         return msg
 
 
-def log(user: User, admin: int = 0) -> None:
+def log(user: get_user_model(), admin: int = 0) -> None:
     """
     Функция осуществляет запись логов в базу данных и csv файл.
 
diff --git a/main/models.py b/main/models.py
index fcde327..9ec53ca 100644
--- a/main/models.py
+++ b/main/models.py
@@ -4,7 +4,7 @@
 
 
 from django.db import models
-from django.contrib.auth.models import User
+from django.contrib.auth import get_user_model
 from django.db.models.signals import post_save
 from django.dispatch import receiver
 from django.utils import timezone
@@ -24,7 +24,7 @@ class UserProfile(models.Model):
             ('has_control_access', 'Can view admin page'),
         )
 
-    user = models.OneToOneField(to=User, on_delete=models.CASCADE, help_text='Пользователь')
+    user = models.OneToOneField(to=get_user_model(), on_delete=models.CASCADE, help_text='Пользователь')
     role = models.CharField(default='None', max_length=100, help_text='Глобальное имя роли пользователя')
     custom_role_id = models.IntegerField(default=0, help_text='Код роли пользователя')
     image = models.URLField(null=True, blank=True, help_text='Аватарка')
@@ -44,7 +44,7 @@ class UserProfile(models.Model):
         return 'UNDEFINED'
 
 
-@receiver(post_save, sender=User)
+@receiver(post_save, sender=get_user_model())
 def create_user_profile(instance, created, **kwargs) -> None:
     """
     Функция создания профиля пользователя (Userprofile) при регистрации пользователя.
@@ -58,7 +58,7 @@ def create_user_profile(instance, created, **kwargs) -> None:
         UserProfile.objects.create(user=instance)
 
 
-@receiver(post_save, sender=User)
+@receiver(post_save, sender=get_user_model())
 def save_user_profile(instance, **kwargs) -> None:
     """
     Функция записи БД профиля пользователя.
@@ -74,12 +74,12 @@ class RoleChangeLogs(models.Model):
     """
     Модель для логирования изменений ролей пользователя.
     """
-    user = models.ForeignKey(to=User, on_delete=models.CASCADE,
+    user = models.ForeignKey(to=get_user_model(), on_delete=models.CASCADE,
                              help_text='Пользователь, которому присвоили другую роль')
     old_role = models.IntegerField(default=0, help_text='Старая роль')
     new_role = models.IntegerField(default=0, help_text='Присвоенная роль')
     change_time = models.DateTimeField(default=timezone.now, help_text='Дата и время изменения роли')
-    changed_by = models.ForeignKey(to=User, on_delete=models.CASCADE, related_name='changed_by',
+    changed_by = models.ForeignKey(to=get_user_model(), on_delete=models.CASCADE, related_name='changed_by',
                                    help_text='Кем была изменена роль')
 
 
@@ -106,7 +106,7 @@ class UnassignedTicket(models.Model):
     """
     Модель не распределенного тикета.
     """
-    assignee = models.ForeignKey(to=User, on_delete=models.CASCADE, related_name='tickets',
+    assignee = models.ForeignKey(to=get_user_model(), on_delete=models.CASCADE, related_name='tickets',
                                  help_text='Пользователь, с которого снят тикет')
     ticket_id = models.IntegerField(help_text='Номер тикера, для которого сняли ответственного')
     status = models.IntegerField(choices=UnassignedTicketStatus.choices, default=UnassignedTicketStatus.UNASSIGNED,
diff --git a/main/serializers.py b/main/serializers.py
index e72dc7a..70c4352 100644
--- a/main/serializers.py
+++ b/main/serializers.py
@@ -1,7 +1,7 @@
 """
 Сериализаторы.
 """
-from django.contrib.auth.models import User
+from django.contrib.auth import get_user_model
 from rest_framework import serializers
 from main.models import UserProfile
 from access_controller.settings import ZENDESK_ROLES
@@ -17,7 +17,7 @@ class UserSerializer(serializers.HyperlinkedModelSerializer):
     :type email: :class:`list`
     """
     class Meta:
-        model = User
+        model = get_user_model()
         fields = ['email']
 
 
diff --git a/main/tests.py b/main/tests.py
index c06bc21..42c8542 100644
--- a/main/tests.py
+++ b/main/tests.py
@@ -1,6 +1,6 @@
 from urllib.parse import urlparse
 
-from django.contrib.auth.models import User
+from django.contrib.auth import get_user_model
 from django.core import mail
 from django.test import TestCase, Client
 from django.urls import reverse
@@ -71,13 +71,13 @@ class RegistrationTestCase(TestCase):
     def test_registration_user_creating(self):
         with self.settings(EMAIL_BACKEND=self.email_backend):
             self.client.post(reverse('registration'), data={'email': self.any_zendesk_user_email})
-        user = User.objects.get(email=self.any_zendesk_user_email)
+        user = get_user_model().objects.get(email=self.any_zendesk_user_email)
         zendesk_user = zenpy.get_user(self.any_zendesk_user_email)
         self.assertEqual(user.userprofile.name, zendesk_user.name)
 
     def test_permissions_applying(self):
         with self.settings(EMAIL_BACKEND=self.email_backend):
             self.client.post(reverse('registration'), data={'email': self.zendesk_admin_email})
-        user = User.objects.get(email=self.zendesk_admin_email)
+        user = get_user_model().objects.get(email=self.zendesk_admin_email)
         self.assertEqual(user.userprofile.role, 'admin')
         self.assertTrue(user.has_perm('main.has_control_access'))
diff --git a/main/views.py b/main/views.py
index 8490a65..4a7567b 100644
--- a/main/views.py
+++ b/main/views.py
@@ -9,7 +9,8 @@ from typing import Dict, Any, Optional
 from django.contrib import messages
 from django.contrib.auth.decorators import login_required
 from django.contrib.auth.mixins import LoginRequiredMixin, PermissionRequiredMixin
-from django.contrib.auth.models import User, Permission
+from django.contrib.auth import get_user_model
+from django.contrib.auth.models import Permission
 from django.contrib.auth.tokens import default_token_generator
 from django.contrib.auth.forms import PasswordResetForm
 from django.contrib.auth.views import LoginView
@@ -83,7 +84,7 @@ class CustomRegistrationView(RegistrationView):
     }
     redirect_url = 'done'
 
-    def register(self, form: CustomRegistrationForm) -> Optional[User]:
+    def register(self, form: CustomRegistrationForm) -> Optional[get_user_model()]:
         """
         Функция регистрации пользователя.
         1. Ввод email пользователя, указанный на Zendesk
@@ -128,7 +129,7 @@ class CustomRegistrationView(RegistrationView):
             return None
 
     @staticmethod
-    def set_permission(user: User) -> None:
+    def set_permission(user: get_user_model()) -> None:
         """
         Функция дает разрешение на просмотр страница администратора, если пользователь имеет роль admin.
 
@@ -142,7 +143,7 @@ class CustomRegistrationView(RegistrationView):
             )
             user.user_permissions.add(permission)
 
-    def get_success_url(self, user: User = None) -> Dict:
+    def get_success_url(self, user: get_user_model() = None) -> Dict:
         """
         Функция возвращает url-адрес страницы, куда нужно перейти после успешной/не успешной регистрации.
         Используется самой django-registration.