diff --git a/packages/celery-library/src/celery_library/task_manager.py b/packages/celery-library/src/celery_library/task_manager.py
index ad6e15844ce..afe0a3b267e 100644
--- a/packages/celery-library/src/celery_library/task_manager.py
+++ b/packages/celery-library/src/celery_library/task_manager.py
@@ -7,6 +7,7 @@
 from celery.exceptions import CeleryError  # type: ignore[import-untyped]
 from common_library.async_tools import make_async
 from models_library.progress_bar import ProgressReport
+from pydantic import BaseModel
 from servicelib.celery.models import (
     TASK_DONE_STATES,
     ExecutionMetadata,
@@ -31,6 +32,21 @@
 _MAX_PROGRESS_VALUE = 1.0
 
 
+def _serialize_task_params(task_params: dict[str, Any]) -> dict[str, Any]:
+    """Recursively convert Pydantic models to dicts for safe serialization."""
+
+    def _serialize(value: Any) -> Any:
+        if isinstance(value, BaseModel):
+            return value.model_dump(mode="json")
+        if isinstance(value, dict):
+            return {k: _serialize(v) for k, v in value.items()}
+        if isinstance(value, (list, tuple, set)):
+            return type(value)(_serialize(v) for v in value)
+        return value
+
+    return {k: _serialize(v) for k, v in task_params.items()}
+
+
 @dataclass(frozen=True)
 class CeleryTaskManager:
     _celery_app: Celery
@@ -66,7 +82,7 @@ async def submit_task(
                 self._celery_app.send_task(
                     execution_metadata.name,
                     task_id=task_key,
-                    kwargs={"task_key": task_key} | task_params,
+                    kwargs={"task_key": task_key} | _serialize_task_params(task_params),
                     queue=execution_metadata.queue.value,
                 )
             except CeleryError as exc:
diff --git a/services/storage/src/simcore_service_storage/modules/celery/__init__.py b/services/storage/src/simcore_service_storage/modules/celery/__init__.py
index 3f292337c73..202c5a7bca5 100644
--- a/services/storage/src/simcore_service_storage/modules/celery/__init__.py
+++ b/services/storage/src/simcore_service_storage/modules/celery/__init__.py
@@ -38,7 +38,7 @@ async def on_startup() -> None:
             )
 
             register_celery_types()
-            register_pydantic_types(FileUploadCompletionBody, FileMetaData, FoldersBody)
+            # NOTE: remove register_pydantic_types(FileUploadCompletionBody, FileMetaData, FoldersBody)
 
     async def on_shutdown() -> None:
         with log_context(_logger, logging.INFO, "Shutting down Celery"):