diff --git a/setup.cfg b/setup.cfg
index aa32d3f..c98ddad 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,12 +1,13 @@
 [metadata]
 name = Flask-authgen-jwt
-version = 3.0.0
+version = 3.0.1
 author = Diego Martinez and Guillermo Ortega
 author_email = gd-code@outlook.com
 description = JWT authentication and generator for Flask routes
 long_description = file: README.md
 long_description_content_type = text/markdown
 requires-python = ">=3.9"
+license_files = LICENSE
 url = https://github.com/dmtzs/Flask-authgen-jwt
 project_urls =
     Bug Tracker = https://github.com/dmtzs/Flask-authgen-jwt/issues
diff --git a/src/flask_authgen_jwt.py b/src/flask_authgen_jwt.py
index 7e773d9..b2837e7 100644
--- a/src/flask_authgen_jwt.py
+++ b/src/flask_authgen_jwt.py
@@ -20,7 +20,7 @@
 
 class Core():
     basic_auth_callback: Callable[[str, str], bool] = None
-    enc_dec_jwt_callback: dict[Union[bytes, str]] = None
+    enc_dec_jwt_callback: dict[str, Union[bytes, str]] = None
     get_user_roles_callback: list = None
     personal_credentials: tuple[str, str] = None
 
@@ -104,7 +104,7 @@ def ensure_sync(self, func: Callable) -> Callable:
 
 class GenJwt(Core):
     def __init__(self, rsa_encrypt: bool = False) -> None:
-        self.jwt_fields_attr: dict = None
+        self.jwt_fields_attr: dict[str, datetime] = None
         self.rsa_encrypt: bool = rsa_encrypt
 
     def __create_jwt_payload(self, bauth_credentials: dict[str, str]) -> dict[str, Union[str, datetime]]:
@@ -179,7 +179,7 @@ def __encode_jwt(self, payload: dict) -> Optional[str]:
             encoded_token = None
         return encoded_token
 
-    def jwt_claims(self, func: Callable[[None], dict]) -> None:
+    def jwt_claims(self, func: Callable[[None], dict[str, datetime]]) -> None:
         """Decorator to add the claims to the JWT payload, default fields are:
         - username: username of the user
         - password: password of the user
@@ -290,7 +290,7 @@ def __verify_token(self, token: dict) -> None:
                 if key not in token:
                     self.gen_abort_error("Credentials to validate for authentication inside token are not correct", 401)
     
-    def __authenticate_credentials(self, token: dict) -> bool:
+    def __authenticate_credentials(self, token: dict[str, str]) -> bool:
         """
         Verify the credentials of the user, if the credentials are not correct then the user will be unauthorized
         :param token: token to verify the credentials