diff --git a/CHANGELOG.md b/CHANGELOG.md
index 82b724b..f2df1c9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,18 @@
 
 All notable changes to this project will be documented in this file.
 
+## [0.5.4] - 2025-10-01
+
+### Added
+
+- Alternate/pre-decessing login url for v6
+
+## [0.5.3] - 2025-09-26
+
+### Changed
+
+- Improved unauthorized and forbidden handling
+
 ## [0.5.1] - 2025-08-31
 
 ### Changed
diff --git a/airos/base.py b/airos/base.py
index dabcdbe..c1ae6c4 100644
--- a/airos/base.py
+++ b/airos/base.py
@@ -26,6 +26,7 @@
     AirOSDataMissingError,
     AirOSDeviceConnectionError,
     AirOSKeyDataMissingError,
+    AirOSUrlNotFoundError,
 )
 
 _LOGGER = logging.getLogger(__name__)
@@ -71,7 +72,10 @@ def __init__(
         self.current_csrf_token: str | None = None
 
         # Mostly 8.x API endpoints, login/status are the same in 6.x
-        self._login_url = f"{self.base_url}/api/auth"
+        self._login_urls = {
+            "default": f"{self.base_url}/api/auth",
+            "v6_alternative": f"{self.base_url}/login.cgi",
+        }
         self._status_cgi_url = f"{self.base_url}/status.cgi"
         # Presumed 8.x only endpoints
         self._stakick_cgi_url = f"{self.base_url}/stakick.cgi"
@@ -216,7 +220,7 @@ async def _request_json(
             request_headers.update(headers)
 
         try:
-            if url != self._login_url and not self.connected:
+            if url not in self._login_urls.values() and not self.connected:
                 _LOGGER.error("Not connected, login first")
                 raise AirOSDeviceConnectionError from None
 
@@ -232,7 +236,7 @@ async def _request_json(
                 _LOGGER.debug("Successfully fetched JSON from %s", url)
 
                 # If this is the login request, we need to store the new auth data
-                if url == self._login_url:
+                if url in self._login_urls.values():
                     self._store_auth_data(response)
                     self.connected = True
 
@@ -243,6 +247,8 @@ async def _request_json(
             )
             if err.status in [401, 403]:
                 raise AirOSConnectionAuthenticationError from err
+            if err.status in [404]:
+                raise AirOSUrlNotFoundError from err
             raise AirOSConnectionSetupError from err
         except (TimeoutError, aiohttp.ClientError) as err:
             _LOGGER.exception("Error during API call to %s", url)
@@ -258,7 +264,18 @@ async def login(self) -> None:
         """Login to AirOS device."""
         payload = {"username": self.username, "password": self.password}
         try:
-            await self._request_json("POST", self._login_url, json_data=payload)
+            await self._request_json(
+                "POST", self._login_urls["default"], json_data=payload
+            )
+        except AirOSUrlNotFoundError:
+            try:
+                await self._request_json(
+                    "POST", self._login_urls["v6_alternative"], json_data=payload
+                )
+            except AirOSConnectionSetupError as err:
+                raise AirOSConnectionSetupError(
+                    "Failed to login to default and alternate AirOS device urls"
+                ) from err
         except AirOSConnectionSetupError as err:
             raise AirOSConnectionSetupError("Failed to login to AirOS device") from err
 
diff --git a/airos/exceptions.py b/airos/exceptions.py
index f19e59d..339d6fd 100644
--- a/airos/exceptions.py
+++ b/airos/exceptions.py
@@ -39,3 +39,7 @@ class AirOSEndpointError(AirOSDiscoveryError):
 
 class AirOSNotSupportedError(AirOSException):
     """Raised when method not available for device."""
+
+
+class AirOSUrlNotFoundError(AirOSException):
+    """Raised when url not available for device."""
diff --git a/pyproject.toml b/pyproject.toml
index 0985bce..281e7fa 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name            = "airos"
-version         = "0.5.3"
+version         = "0.5.4"
 license         = "MIT"
 description     = "Ubiquiti airOS module(s) for Python 3."
 readme          = "README.md"