diff --git a/pyproject.toml b/pyproject.toml
index 888fe1ad0..c95ceacbd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,6 +19,7 @@ dependencies = [
     "faiss-cpu>=1.11.0",
     "fastapi>=0.116.0",
     "google>=3.0.0",
+    "filetype>=1.2.0",
     "google-genai>=1.29.0",
     "httpx>=0.28.1",
     "json-repair>=0.47.6",
diff --git a/requirements.txt b/requirements.txt
index 085915ca3..eb6b499a2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,6 +11,7 @@ dotenv
 faiss-cpu
 fastapi
 fastmcp
+filetype
 rjieba
 jsonlines
 maim_message
diff --git a/src/plugins/built_in/maizone_refactored/services/content_service.py b/src/plugins/built_in/maizone_refactored/services/content_service.py
index c302f15e9..f4793477b 100644
--- a/src/plugins/built_in/maizone_refactored/services/content_service.py
+++ b/src/plugins/built_in/maizone_refactored/services/content_service.py
@@ -6,7 +6,7 @@
 import asyncio
 import base64
 import datetime
-import imghdr
+import filetype
 from collections.abc import Callable
 
 import aiohttp
@@ -238,11 +238,11 @@ class ContentService:
                             continue
                         image_bytes = await resp.read()
 
-                image_format = imghdr.what(None, image_bytes)
-                if not image_format:
+                kind = filetype.guess(image_bytes)
+                if kind is None:
                     logger.error(f"无法识别图片格式: {image_url}")
                     return None
-
+                image_format = kind.extension
                 image_base64 = base64.b64encode(image_bytes).decode("utf-8")
 
                 vision_model_name = self.get_config("models.vision_model", "vlm")