diff --git a/frontend/src/api/admin.ts b/frontend/src/api/admin.ts
index 06014fb..7a6c2e2 100644
--- a/frontend/src/api/admin.ts
+++ b/frontend/src/api/admin.ts
@@ -166,6 +166,8 @@ export interface CheckUpdateResponse {
   latest_version: string | null
   has_update: boolean
   release_url: string | null
+  release_notes: string | null
+  published_at: string | null
   error: string | null
 }
 
diff --git a/frontend/src/components/common/UpdateDialog.vue b/frontend/src/components/common/UpdateDialog.vue
index 75f7b7d..8e75670 100644
--- a/frontend/src/components/common/UpdateDialog.vue
+++ b/frontend/src/components/common/UpdateDialog.vue
@@ -17,7 +17,7 @@
       </h2>
 
       <!-- Version Info -->
-      <div class="flex items-center gap-3 mb-4">
+      <div class="flex items-center gap-3 mb-2">
         <span class="px-3 py-1.5 rounded-lg bg-muted text-sm font-mono text-muted-foreground">
           v{{ currentVersion }}
         </span>
@@ -39,8 +39,33 @@
         </span>
       </div>
 
-      <!-- Description -->
-      <p class="text-sm text-muted-foreground max-w-xs">
+      <!-- Published At -->
+      <p
+        v-if="publishedAt"
+        class="text-xs text-muted-foreground mb-4"
+      >
+        发布于 {{ formattedPublishedAt }}
+      </p>
+
+      <!-- Release Notes -->
+      <div
+        v-if="releaseNotes"
+        class="w-full mt-2 mb-4"
+      >
+        <div class="text-left text-xs font-medium text-muted-foreground mb-2">
+          更新内容
+        </div>
+        <div
+          class="w-full max-h-48 overflow-y-auto rounded-lg bg-muted/50 p-3 text-left text-sm text-foreground/80 prose prose-sm dark:prose-invert prose-p:my-1 prose-ul:my-1 prose-li:my-0"
+          v-html="renderedReleaseNotes"
+        />
+      </div>
+
+      <!-- Description (fallback when no release notes) -->
+      <p
+        v-else
+        class="text-sm text-muted-foreground max-w-xs mb-4"
+      >
         新版本已发布，建议更新以获得最新功能和安全修复
       </p>
     </div>
@@ -66,16 +91,20 @@
 </template>
 
 <script setup lang="ts">
-import { ref, watch } from 'vue'
+import { ref, watch, computed } from 'vue'
 import { Dialog } from '@/components/ui'
 import Button from '@/components/ui/button.vue'
 import HeaderLogo from '@/components/HeaderLogo.vue'
+import { marked } from 'marked'
+import DOMPurify from 'dompurify'
 
 const props = defineProps<{
   modelValue: boolean
   currentVersion: string
   latestVersion: string
   releaseUrl: string | null
+  releaseNotes: string | null
+  publishedAt: string | null
 }>()
 
 const emit = defineEmits<{
@@ -92,6 +121,37 @@ watch(isOpen, (val) => {
   emit('update:modelValue', val)
 })
 
+// 格式化发布时间
+const formattedPublishedAt = computed(() => {
+  if (!props.publishedAt) return ''
+  try {
+    const date = new Date(props.publishedAt)
+    return date.toLocaleDateString('zh-CN', {
+      year: 'numeric',
+      month: 'long',
+      day: 'numeric'
+    })
+  } catch {
+    return props.publishedAt
+  }
+})
+
+// 渲染 Markdown 格式的 Release Notes（使用 DOMPurify 防止 XSS）
+const renderedReleaseNotes = computed(() => {
+  if (!props.releaseNotes) return ''
+  try {
+    const html = marked.parse(props.releaseNotes, { async: false }) as string
+    return DOMPurify.sanitize(html)
+  } catch {
+    // 如果 markdown 解析失败，返回原始文本（转义 HTML）
+    return props.releaseNotes
+      .replace(/&/g, '&amp;')
+      .replace(/</g, '&lt;')
+      .replace(/>/g, '&gt;')
+      .replace(/\n/g, '<br>')
+  }
+})
+
 function handleLater() {
   // 记录忽略的版本，24小时内不再提醒
   const ignoreKey = 'aether_update_ignore'
diff --git a/frontend/src/layouts/MainLayout.vue b/frontend/src/layouts/MainLayout.vue
index f9db4eb..014ece9 100644
--- a/frontend/src/layouts/MainLayout.vue
+++ b/frontend/src/layouts/MainLayout.vue
@@ -303,6 +303,8 @@
       :current-version="updateInfo.current_version"
       :latest-version="updateInfo.latest_version || ''"
       :release-url="updateInfo.release_url"
+      :release-notes="updateInfo.release_notes"
+      :published-at="updateInfo.published_at"
     />
   </AppShell>
 </template>
diff --git a/src/api/admin/models/global_models.py b/src/api/admin/models/global_models.py
index 451ca48..f74f111 100644
--- a/src/api/admin/models/global_models.py
+++ b/src/api/admin/models/global_models.py
@@ -391,7 +391,6 @@ class AdminUpdateGlobalModelAdapter(AdminApiAdapter):
                 raise InvalidRequestException("该模型正在被其他操作更新，请稍后重试")
             raise
         old_model_name = old_global_model.name if old_global_model else None
-        new_model_name = self.payload.name if self.payload.name else old_model_name
 
         # 执行更新（此时仍持有行锁）
         global_model = GlobalModelService.update_global_model(
@@ -407,13 +406,8 @@ class AdminUpdateGlobalModelAdapter(AdminApiAdapter):
         from src.services.cache.invalidation import get_cache_invalidation_service
 
         cache_service = get_cache_invalidation_service()
-        # 同步清理新旧两个名称的缓存（防止名称变更时的竞态）
         if old_model_name:
-            cache_service.on_global_model_changed(old_model_name, self.global_model_id)
-        if new_model_name and new_model_name != old_model_name:
-            cache_service.on_global_model_changed(new_model_name, self.global_model_id)
-        # 异步失效更多缓存
-        await cache_service.on_global_model_changed_async(global_model.name, global_model.id)
+            await cache_service.on_global_model_changed(old_model_name, self.global_model_id)
 
         return GlobalModelResponse.model_validate(global_model)
 
@@ -461,8 +455,7 @@ class AdminDeleteGlobalModelAdapter(AdminApiAdapter):
 
         cache_service = get_cache_invalidation_service()
         if model_name:
-            cache_service.on_global_model_changed(model_name, model_id)
-            await cache_service.on_global_model_changed_async(model_name, model_id)
+            await cache_service.on_global_model_changed(model_name, model_id)
 
         return None
 
diff --git a/src/api/admin/system.py b/src/api/admin/system.py
index 9a0f7a2..e77f208 100644
--- a/src/api/admin/system.py
+++ b/src/api/admin/system.py
@@ -96,13 +96,15 @@ async def check_update():
     """
     检查系统更新
 
-    从 GitHub Tags 获取最新版本并与当前版本对比。
+    从 GitHub Releases 获取最新版本并与当前版本对比。
 
     **返回字段**:
     - `current_version`: 当前版本号
     - `latest_version`: 最新版本号
     - `has_update`: 是否有更新可用
     - `release_url`: 最新版本的 GitHub 页面链接
+    - `release_notes`: 更新日志 (Markdown 格式)
+    - `published_at`: 发布时间 (ISO 8601 格式)
     """
     import httpx
 
@@ -110,14 +112,25 @@ async def check_update():
 
     current_version = _get_current_version()
     github_repo = "Aethersailor/Aether"
-    github_tags_url = f"https://api.github.com/repos/{github_repo}/tags"
+    github_releases_url = f"https://api.github.com/repos/{github_repo}/releases"
+
+    def _make_empty_response(error: str | None = None):
+        return {
+            "current_version": current_version,
+            "latest_version": None,
+            "has_update": False,
+            "release_url": None,
+            "release_notes": None,
+            "published_at": None,
+            "error": error,
+        }
 
     try:
         async with HTTPClientPool.get_temp_client(
             timeout=httpx.Timeout(connect=5.0, read=10.0, write=5.0, pool=5.0)
         ) as client:
             response = await client.get(
-                github_tags_url,
+                github_releases_url,
                 headers={
                     "Accept": "application/vnd.github.v3+json",
                     "User-Agent": f"Aether/{current_version}",
@@ -126,43 +139,29 @@ async def check_update():
             )
 
             if response.status_code != 200:
-                return {
-                    "current_version": current_version,
-                    "latest_version": None,
-                    "has_update": False,
-                    "release_url": None,
-                    "error": f"GitHub API 返回错误: {response.status_code}",
-                }
+                return _make_empty_response(f"GitHub API 返回错误: {response.status_code}")
 
-            tags = response.json()
-            if not tags:
-                return {
-                    "current_version": current_version,
-                    "latest_version": None,
-                    "has_update": False,
-                    "release_url": None,
-                    "error": None,
-                }
+            releases = response.json()
+            if not releases:
+                return _make_empty_response()
 
-            # 找到最新的版本 tag（按版本号排序，而非时间）
-            version_tags = []
-            for tag in tags:
-                tag_name = tag.get("name", "")
-                if tag_name.startswith("v") or tag_name[0].isdigit():
-                    version_tags.append((tag_name, _parse_version(tag_name)))
+            # 找到最新的正式 release（排除 prerelease 和 draft，按版本号排序）
+            valid_releases = []
+            for release in releases:
+                if release.get("prerelease") or release.get("draft"):
+                    continue
+                tag_name = release.get("tag_name", "")
+                if tag_name.startswith("v") or (tag_name and tag_name[0].isdigit()):
+                    valid_releases.append((release, _parse_version(tag_name)))
 
-            if not version_tags:
-                return {
-                    "current_version": current_version,
-                    "latest_version": None,
-                    "has_update": False,
-                    "release_url": None,
-                    "error": None,
-                }
+            if not valid_releases:
+                return _make_empty_response()
 
             # 按版本号排序，取最大的
-            version_tags.sort(key=lambda x: x[1], reverse=True)
-            latest_tag = version_tags[0][0]
+            valid_releases.sort(key=lambda x: x[1], reverse=True)
+            latest_release = valid_releases[0][0]
+
+            latest_tag = latest_release.get("tag_name", "")
             latest_version = latest_tag.lstrip("v")
 
             current_tuple = _parse_version(current_version)
@@ -173,26 +172,17 @@ async def check_update():
                 "current_version": current_version,
                 "latest_version": latest_version,
                 "has_update": has_update,
-                "release_url": f"https://github.com/{github_repo}/releases/tag/{latest_tag}",
+                "release_url": latest_release.get("html_url")
+                or f"https://github.com/{github_repo}/releases/tag/{latest_tag}",
+                "release_notes": latest_release.get("body"),
+                "published_at": latest_release.get("published_at"),
                 "error": None,
             }
 
     except httpx.TimeoutException:
-        return {
-            "current_version": current_version,
-            "latest_version": None,
-            "has_update": False,
-            "release_url": None,
-            "error": "检查更新超时",
-        }
+        return _make_empty_response("检查更新超时")
     except Exception as e:
-        return {
-            "current_version": current_version,
-            "latest_version": None,
-            "has_update": False,
-            "release_url": None,
-            "error": f"检查更新失败: {str(e)}",
-        }
+        return _make_empty_response(f"检查更新失败: {str(e)}")
 
 
 pipeline = ApiRequestPipeline()