diff --git a/run_telegram_bot.py b/run_telegram_bot.py
index d5d27c4..16839df 100644
--- a/run_telegram_bot.py
+++ b/run_telegram_bot.py
@@ -18,6 +18,7 @@ import os
 import sys
 import asyncio
 import logging
+import re
 from datetime import datetime, time
 from dotenv import load_dotenv
 
@@ -35,6 +36,37 @@ logging.basicConfig(
 )
 logger = logging.getLogger('TelegramBot')
 
+_TELEGRAM_BOT_URL_RE = re.compile(r"(api\.telegram\.org/bot)[^/\s\"]+")
+_TELEGRAM_TOKEN_RE = re.compile(r"\b\d{8,12}:[A-Za-z0-9_-]{32,64}\b")
+
+
+def _redact_sensitive_log_value(value):
+    if not isinstance(value, str):
+        return value
+    value = _TELEGRAM_BOT_URL_RE.sub(r"\1<redacted>", value)
+    return _TELEGRAM_TOKEN_RE.sub("<telegram-token>", value)
+
+
+class SensitiveTokenFilter(logging.Filter):
+    def filter(self, record):
+        record.msg = _redact_sensitive_log_value(record.msg)
+        if isinstance(record.args, tuple):
+            record.args = tuple(_redact_sensitive_log_value(arg) for arg in record.args)
+        elif isinstance(record.args, dict):
+            record.args = {
+                key: _redact_sensitive_log_value(value)
+                for key, value in record.args.items()
+            }
+        return True
+
+
+for handler in logging.getLogger().handlers:
+    handler.addFilter(SensitiveTokenFilter())
+
+# python-telegram-bot uses httpx internally; INFO logs include Telegram Bot API URLs.
+logging.getLogger("httpx").setLevel(logging.WARNING)
+logging.getLogger("httpcore").setLevel(logging.WARNING)
+
 def check_dependencies():
     """檢查必要的套件"""
     try: