diff --git a/astrbot/core/provider/sources/edge_tts_source.py b/astrbot/core/provider/sources/edge_tts_source.py
index 3cf39883ec..2f3762273e 100644
--- a/astrbot/core/provider/sources/edge_tts_source.py
+++ b/astrbot/core/provider/sources/edge_tts_source.py
@@ -3,10 +3,8 @@
 import subprocess
 
 import edge_tts
-from edge_tts.constants import WSS_HEADERS
 
 from astrbot.core import logger
-from astrbot.core.provider.headers import DEFAULT_USER_AGENT
 from astrbot.core.utils.astrbot_path import get_astrbot_temp_path
 from astrbot.core.utils.datetime_utils import generate_timestamp_id
 
@@ -14,8 +12,10 @@
 from ..provider import TTSProvider
 from ..register import register_provider_adapter
 
-# Edge TTS exposes synthesis headers as a shared SDK default, not a client option.
-WSS_HEADERS["User-Agent"] = DEFAULT_USER_AGENT
+# NOTE: do NOT overwrite edge-tts' User-Agent. Microsoft's readaloud endpoint
+# answers 403 "Invalid response status" when the UA is not a browser-like Edge UA,
+# and the SDK already ships a valid one. Setting WSS_HEADERS["User-Agent"] to
+# "astrbot/<version>" broke synthesis for every reply.
 
 """
 edge_tts 方式，能够免费、快速生成语音，使用需要先安装edge-tts库