diff --git a/middleware/app_be/services/wrapperservice.py b/middleware/app_be/services/wrapperservice.py
index bae55f6..8bddd3a 100644
--- a/middleware/app_be/services/wrapperservice.py
+++ b/middleware/app_be/services/wrapperservice.py
@@ -6,7 +6,7 @@ class WrapperService:
     @staticmethod
     def wrap_file(file_bytes: bytes) -> str:
         file_encoded_b64 = base64.b64encode(file_bytes)
-        return file_encoded_b64.decode('utf-8')
+        return file_encoded_b64.decode()
 
     @staticmethod
     def unwrap_file(file_str: str) -> bytes: