diff --git a/gotrue/_async/api.py b/gotrue/_async/api.py
index 9f2098b6..e0b1a7b9 100644
--- a/gotrue/_async/api.py
+++ b/gotrue/_async/api.py
@@ -423,8 +423,7 @@ def _create_request_headers(self, *, jwt: str) -> Dict[str, str]:
             The headers required for a successful request statement with the
             supabase backend.
         """
-        headers = {**self.headers}
-        headers["Authorization"] = f"Bearer {jwt}"
+        headers = {**self.headers, "Authorization": f"Bearer {jwt}"}
         return headers
 
     async def sign_out(self, *, jwt: str) -> None:
diff --git a/gotrue/_sync/api.py b/gotrue/_sync/api.py
index dfb6c76f..bec3f70b 100644
--- a/gotrue/_sync/api.py
+++ b/gotrue/_sync/api.py
@@ -423,8 +423,7 @@ def _create_request_headers(self, *, jwt: str) -> Dict[str, str]:
             The headers required for a successful request statement with the
             supabase backend.
         """
-        headers = {**self.headers}
-        headers["Authorization"] = f"Bearer {jwt}"
+        headers = {**self.headers, "Authorization": f"Bearer {jwt}"}
         return headers
 
     def sign_out(self, *, jwt: str) -> None: