diff --git a/setup.py b/setup.py
index e0aa00e..b66fa6e 100644
--- a/setup.py
+++ b/setup.py
@@ -5,7 +5,7 @@
 
 setuptools.setup(
     name="streamlit-authenticator",
-    version="0.4.2",
+    version="0.4.2-alpha",
     author="Mohammad Khorasani",
     author_email="khorasani.mohammad@gmail.com",
     description="A secure authentication module to manage user access in a Streamlit application.",
diff --git a/streamlit_authenticator/models/authentication_model.py b/streamlit_authenticator/models/authentication_model.py
index c7ec620..1631e8b 100644
--- a/streamlit_authenticator/models/authentication_model.py
+++ b/streamlit_authenticator/models/authentication_model.py
@@ -14,21 +14,22 @@
 
 import streamlit as st
 
-from ..models.cloud import CloudModel
-from ..models.oauth2 import GoogleModel
-from ..models.oauth2 import MicrosoftModel
 from .. import params
-from ..utilities import (Encryptor,
-                         Hasher,
-                         Helpers,
-                         CloudError,
-                         CredentialsError,
-                         ForgotError,
-                         LoginError,
-                         RegisterError,
-                         ResetError,
-                         UpdateError,
-                         Validator)
+from ..models.cloud import CloudModel
+from ..models.oauth2 import GoogleModel, MicrosoftModel
+from ..utilities import (
+    CloudError,
+    CredentialsError,
+    Encryptor,
+    ForgotError,
+    Hasher,
+    Helpers,
+    LoginError,
+    RegisterError,
+    ResetError,
+    UpdateError,
+    Validator,
+)
 
 
 class AuthenticationModel:
@@ -568,7 +569,7 @@ def register_user(self, new_first_name: str, new_last_name: str, new_email: str,
                                            new_password, new_email, password_hint, roles)
                 pre_authorized.remove(new_email)
                 if self.path:
-                    Helpers.update_config_file(self.path, 'pre-authorized', pre_authorized)
+                    Helpers.update_config_file(self.path, 'pre-authorized', {"emails": pre_authorized})
                 if callback:
                     callback({'widget': 'Register user', 'new_name': new_first_name,
                               'new_last_name': new_last_name, 'new_email': new_email,
diff --git a/streamlit_authenticator/models/cookie_model.py b/streamlit_authenticator/models/cookie_model.py
index 56e1c8b..17d5236 100644
--- a/streamlit_authenticator/models/cookie_model.py
+++ b/streamlit_authenticator/models/cookie_model.py
@@ -48,9 +48,9 @@ def __init__(
         """
         if path:
             config = Helpers.read_config_file(path)
-            self.cookie_name        = config['cookie']['name']
-            self.cookie_key         = config['cookie']['key']
-            self.cookie_expiry_days = config['cookie']['expiry_days']
+            self.cookie_name        = cookie_name or config['cookie']['name']
+            self.cookie_key         = cookie_key or config['cookie']['key']
+            self.cookie_expiry_days = cookie_expiry_days if cookie_expiry_days is not None else config['cookie']['expiry_days']
         else:
             self.cookie_name            =   cookie_name
             self.cookie_key             =   cookie_key