diff --git a/backend/app/services/gcs.py b/backend/app/services/gcs.py
index 8b03f96..09f60c5 100644
--- a/backend/app/services/gcs.py
+++ b/backend/app/services/gcs.py
@@ -133,7 +133,7 @@ async def upload_file_to_gcs(file: UploadFile, destination_path: str) -> str:
     return await gcs_service.upload_file_to_gcs(file, destination_path)
 
 async def upload_vtt_to_gcs(content: str, destination_path: str) -> str:
-    return await gcs_service.upload_text_to_gcs(content, destination_path, "text/vtt")
+    return await gcs_service.upload_text_to_gcs(content, destination_path, "text/vtt; charset=utf-8")
 
 async def upload_json_to_gcs(content: str, destination_path: str) -> str:
     return await gcs_service.upload_text_to_gcs(content, destination_path, "application/json")