diff --git a/metagpt/tools/iflytek_tts.py b/metagpt/tools/iflytek_tts.py
index a91d8091b..cb87d2e7f 100644
--- a/metagpt/tools/iflytek_tts.py
+++ b/metagpt/tools/iflytek_tts.py
@@ -136,7 +136,7 @@ async def oas3_iflytek_tts(text: str, voice: str = "", app_id: str = "", api_key
     if not voice:
         voice = CONFIG.IFLYTEK_VOICE or DEFAULT_IFLYTEK_VOICE
 
-    filename = Path(__file__).parent / (str(uuid.uuid4()).replace("-", "") + ".mp3")
+    filename = Path(__file__).parent / (uuid.uuid4().hex + ".mp3")
     try:
         tts = IFlyTekTTS(app_id=app_id, api_key=api_key, api_secret=api_secret)
         await tts.synthesize_speech(text=text, output_file=str(filename), voice=voice)
diff --git a/metagpt/utils/s3.py b/metagpt/utils/s3.py
index 96b457972..dde68f720 100644
--- a/metagpt/utils/s3.py
+++ b/metagpt/utils/s3.py
@@ -132,7 +132,7 @@ class S3:
 
     async def cache(self, data: str, file_ext: str, format: str = "") -> str:
         """Save data to remote S3 and return url"""
-        object_name = str(uuid.uuid4()).replace("-", "") + file_ext
+        object_name = uuid.uuid4().hex + file_ext
         path = Path(__file__).parent
         pathname = path / object_name
         try: