diff --git a/backend/app/services/firmware_service.py b/backend/app/services/firmware_service.py
index e849cda..0a93ba4 100644
--- a/backend/app/services/firmware_service.py
+++ b/backend/app/services/firmware_service.py
@@ -42,8 +42,8 @@ async def submit_firmware_update(firmware_update_id: UUID) -> tuple[FirmwareUpda
                     retry_interval=db_firmware_update.retry_interval,
                     firmware=FirmwareType(
                         location=db_firmware_update.location,
-                        retrieve_date_time=db_firmware_update.retrieve_date_time,
-                        install_date_time=db_firmware_update.install_date_time
+                        retrieve_date_time=db_firmware_update.retrieve_date_time.isoformat(),
+                        install_date_time=db_firmware_update.install_date_time.isoformat()
                     )
                 ))
             if result.status == "Accepted" or result.status == "AcceptedCanceled":