diff --git a/xbox/webapi/authentication/models.py b/xbox/webapi/authentication/models.py
index 45578376..a60df88d 100644
--- a/xbox/webapi/authentication/models.py
+++ b/xbox/webapi/authentication/models.py
@@ -125,6 +125,7 @@ class SisuAuthorizationResponse(PascalCaseModel):
     authorization_token: XSTSResponse
     web_page: str
     sandbox: str
+    refresh_token: str
     use_modern_gamertag: Optional[bool] = None
 
 
diff --git a/xbox/webapi/authentication/xal.py b/xbox/webapi/authentication/xal.py
index ffb05c22..0245681d 100644
--- a/xbox/webapi/authentication/xal.py
+++ b/xbox/webapi/authentication/xal.py
@@ -231,8 +231,8 @@ async def request_sisu_authentication(
             resp.headers["X-SessionId"],
         )
 
-    async def do_sisu_authorization(
-        self, sisu_session_id: str, access_token_jwt: str, device_token_jwt: str
+       async def do_sisu_authorization(
+        self, sisu_session_id: str, access_token_jwt: str, device_token_jwt: str, refresh_sisu:str
     ) -> SisuAuthorizationResponse:
         """
         Sisu authorization
@@ -250,6 +250,7 @@ async def do_sisu_authorization(
             "SiteName": "user.auth.xboxlive.com",
             "SessionId": sisu_session_id,
             "ProofKey": self.session.request_signer.proof_field,
+            "refresh_token": refresh_sisu,
         }
 
         resp = await self.session.send_signed(
@@ -257,7 +258,7 @@ async def do_sisu_authorization(
         )
         resp.raise_for_status()
         return SisuAuthorizationResponse(**resp.json())
-
+        
     async def xsts_authorization(
         self,
         device_token_jwt: str,