diff --git a/algoliasearch_django/registration.py b/algoliasearch_django/registration.py
index 9b1a79c..026d331 100644
--- a/algoliasearch_django/registration.py
+++ b/algoliasearch_django/registration.py
@@ -36,9 +36,8 @@ def __init__(self, settings=SETTINGS):
 
         self.__registered_models = {}
         self.client = SearchClientSync(app_id, api_key)
-        self.client._config.user_agent.add("Algolia for Django", VERSION).add(
-            "Django", django_version()
-        )
+        self.client.add_user_agent("Algolia for Django", VERSION)
+        self.client.add_user_agent("Django", django_version())
 
     def is_registered(self, model):
         """Checks whether the given models is registered with Algolia engine"""
diff --git a/tests/models.py b/tests/models.py
index f216d49..679d4d7 100644
--- a/tests/models.py
+++ b/tests/models.py
@@ -5,10 +5,10 @@ class User(models.Model):
     name = models.CharField(max_length=30)
     username = models.CharField(max_length=30, unique=True)
     bio = models.CharField(max_length=140, blank=True)
-    followers_count = models.BigIntegerField(default=0)
-    following_count = models.BigIntegerField(default=0)
-    _lat = models.FloatField(default=0)
-    _lng = models.FloatField(default=0)
+    followers_count = models.BigIntegerField(0)
+    following_count = models.BigIntegerField(0)
+    _lat = models.FloatField(0)
+    _lng = models.FloatField(0)
     _permissions = models.CharField(max_length=30, blank=True)
 
     @property
@@ -25,7 +25,7 @@ def permissions(self):
 class Website(models.Model):
     name = models.CharField(max_length=100)
     url = models.URLField()
-    is_online = models.BooleanField(default=False)
+    is_online = models.BooleanField(False)
 
 
 class Example(models.Model):
@@ -34,7 +34,7 @@ class Example(models.Model):
     address = models.CharField(max_length=200)
     lat = models.FloatField()
     lng = models.FloatField()
-    is_admin = models.BooleanField(default=False)
+    is_admin = models.BooleanField(False)
     category = []
     locations = []
     index_me = True