diff --git a/backend/app/api/v1/routes_jobs.py b/backend/app/api/v1/routes_jobs.py
index e55f397..3339be2 100644
--- a/backend/app/api/v1/routes_jobs.py
+++ b/backend/app/api/v1/routes_jobs.py
@@ -1550,14 +1550,14 @@ async def get_accessible_video_edit_state(
         tts_regeneration_queue=[
             TTSRegenerationItem(
                 cue_index=req.get("cue_index"),
-                requested_at=req.get("requested_at"),
+                requested_at=req.get("requested_at").isoformat() if hasattr(req.get("requested_at"), "isoformat") else req.get("requested_at"),
                 new_text=req.get("new_text"),
                 status=req.get("status", "pending"),
                 error_message=req.get("error_message")
             )
             for req in edit_state.get("tts_regeneration_queue", [])
         ],
-        last_render_at=edit_state.get("last_render_at"),
+        last_render_at=edit_state.get("last_render_at").isoformat() if edit_state.get("last_render_at") else None,
         total_duration_ms=total_duration_ms,
         accessible_video_url=accessible_video_url
     )