diff --git a/trailblazer/clients/authentication_client/google_oauth_client.py b/trailblazer/clients/authentication_client/google_oauth_client.py
index e721b1cf..38304ad8 100644
--- a/trailblazer/clients/authentication_client/google_oauth_client.py
+++ b/trailblazer/clients/authentication_client/google_oauth_client.py
@@ -21,7 +21,7 @@ def get_tokens(self, authorization_code: str) -> TokensResponse:
             code=authorization_code,
             redirect_uri=self.redirect_uri,
         )
-        data: str = request.model_dump_json()
+        data: dict = request.model_dump()
 
         response = requests.post(self.token_uri, data=data)