diff --git a/.github/workflows/auto-tag.yml b/.github/workflows/auto-tag.yml
index cba2f1b..eb3da32 100644
--- a/.github/workflows/auto-tag.yml
+++ b/.github/workflows/auto-tag.yml
@@ -108,3 +108,11 @@ jobs:
           generateReleaseNotes: true
           prerelease: ${{ steps.prerelease.outputs.is_prerelease }}
           token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Sync dev branch with main
+        run: |
+          git fetch origin
+          git checkout dev
+          git merge origin/main --ff-only
+          git push origin dev
+          echo "Synced dev branch with main"
diff --git a/README.md b/README.md
index 82c0cd7..b1916a5 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 
 ![SpectreCore](https://avatars.githubusercontent.com/u/129108081?s=48&v=4)
 
-[![version](https://img.shields.io/badge/version-v2.1.8-blue.svg?style=flat-square)](https://github.com/23q3/astrbot_plugin_SpectreCore)
+[![version](https://img.shields.io/badge/version-v2.1.9-blue.svg?style=flat-square)](https://github.com/23q3/astrbot_plugin_SpectreCore)
 [![license](https://img.shields.io/badge/license-AGPL--3.0-green.svg?style=flat-square)](LICENSE)
 [![author](https://img.shields.io/badge/author-23q3-orange.svg?style=flat-square)](https://github.com/23q3)
 
@@ -70,11 +70,9 @@ SpectreCore (影芯) 是一个为 AstrBot 设计的高级群聊互动插件，
 
 ## 📋 最新版本
 
-### v2.1.8 (2026-01-02)
+### v2.1.9 (2026-01-05)
 
-- ⚡ **优化LLM调用的prompt结构** - 将环境信息移至system_prompt，保持prompt干净以支持知识库检索；基于message_id精确排除当前消息避免历史记录重复 [#76](https://github.com/23q3/astrbot_plugin_SpectreCore/pull/76)
-- 🐛 **修复QQ官方平台help命令** - 检测到QQ官方平台时不输出GitHub链接，避免消息被拦截 [#78](https://github.com/23q3/astrbot_plugin_SpectreCore/issues/78)
-- 🐛 **适配AstrBot新版本API** - 移除对已删除属性的依赖，迁移至新版人格管理接口，增强图片URL提取兼容性
+- 🐛 **修复GIF图片格式识别错误** - 修复图片URL优先级问题，优先使用file字段以保留准确格式信息，避免HTTP URL下载后MIME类型检测错误导致Gemini API返回400 [#81](https://github.com/23q3/astrbot_plugin_SpectreCore/issues/81)
 
 ## ⚠️ 注意事项
 
diff --git a/changelogs/v2.1.9.md b/changelogs/v2.1.9.md
new file mode 100644
index 0000000..0de9dd5
--- /dev/null
+++ b/changelogs/v2.1.9.md
@@ -0,0 +1 @@
+- 🐛 **修复GIF图片格式识别错误** - 修复图片URL优先级问题，优先使用file字段以保留准确格式信息，避免HTTP URL下载后MIME类型检测错误导致Gemini API返回400 [#81](https://github.com/23q3/astrbot_plugin_SpectreCore/issues/81)
diff --git a/main.py b/main.py
index 2b07871..da5390b 100644
--- a/main.py
+++ b/main.py
@@ -7,7 +7,7 @@
     "spectrecore",
     "23q3",
     "使大模型更好的主动回复群聊中的消息，带来生动和沉浸的群聊对话体验",
-    "2.1.8",
+    "2.1.9",
     "https://github.com/23q3/astrbot_plugin_SpectreCore"
 )
 class SpectreCore(Star):
diff --git a/metadata.yaml b/metadata.yaml
index ef80905..75383f2 100644
--- a/metadata.yaml
+++ b/metadata.yaml
@@ -1,7 +1,7 @@
 name: spectrecore # 这是你的插件的唯一识别名。
 desc: 使大模型更好的主动回复群聊中的消息，带来生动和沉浸的群聊对话体验 # 插件简短描述
 help: 自动检测群聊消息并让AI模型进行回复，让群聊更加生动有趣。 # 插件的帮助信息
-version: v2.1.8 # 插件版本号。格式：v1.1.1 或者 v1.1
+version: v2.1.9 # 插件版本号。格式：v1.1.1 或者 v1.1
 author: 23q3 # 作者
 repo: https://github.com/23q3/astrbot_plugin_SpectreCore # 插件的仓库地址
 display_name: 🌟 SpectreCore
diff --git a/utils/llm_utils.py b/utils/llm_utils.py
index c10e119..62505ae 100644
--- a/utils/llm_utils.py
+++ b/utils/llm_utils.py
@@ -214,7 +214,7 @@ async def call_llm(event: AstrMessageEvent, config: AstrBotConfig, context: Cont
                         for component in message.message:
                             if isinstance(component, Image):
                                 try:
-                                    url = component.url or component.file
+                                    url = component.file or component.url
                                     if url:
                                         image_urls.append(url)
                                         if len(image_urls) >= image_count: