diff --git a/auth_lib/__init__.py b/auth_lib/__init__.py
index 2ea2439..7162def 100644
--- a/auth_lib/__init__.py
+++ b/auth_lib/__init__.py
@@ -1,4 +1,4 @@
 from .methods import AuthLib
 
-__version__ = '2024.04.25.2'
+__version__ = '2024.04.25.4'
 __all__ = ["AuthLib"]
diff --git a/auth_lib/airflow/auth_api.py b/auth_lib/airflow/auth_api.py
index bad4cd2..88da8c0 100644
--- a/auth_lib/airflow/auth_api.py
+++ b/auth_lib/airflow/auth_api.py
@@ -22,8 +22,8 @@
 @lru_cache
 def get_auth_api() -> AuthLib:
     auth_api = AuthLib(
-        auth_url=conf.get("api", "auth_url") or os.getenv("AUTH_URL") or DEFAULT_AUTH_URL,
-        userdata_url=conf.get("api", "userdata_url") or os.getenv("USERDATA_URL") or DEFAULT_USERDATA_URL,
+        auth_url=conf.get("api", "auth_url", fallback=None) or os.getenv("AUTH_URL") or DEFAULT_AUTH_URL,
+        userdata_url=conf.get("api", "userdata_url", fallback=None) or os.getenv("USERDATA_URL") or DEFAULT_USERDATA_URL,
     )
     return auth_api