diff --git a/internal/logic/update/checker.go b/internal/logic/update/checker.go
index 75c9a8b..25a4e11 100644
--- a/internal/logic/update/checker.go
+++ b/internal/logic/update/checker.go
@@ -35,8 +35,8 @@ func CheckForUpdate(ctx context.Context, force bool) (*CheckResult, error) {
 		}
 	}
 
-	// Call GitHub API
-	release, etag, err := fetchLatestRelease(ctx)
+	// Call GitHub API（force 时不带 ETag 条件请求，见 fetchLatestRelease 注释）
+	release, etag, err := fetchLatestRelease(ctx, !force)
 	if err != nil {
 		return nil, fmt.Errorf("failed to fetch latest release: %w", err)
 	}
@@ -120,8 +120,11 @@ func CheckForUpdate(ctx context.Context, force bool) (*CheckResult, error) {
 	return result, nil
 }
 
-// fetchLatestRelease calls the GitHub Releases API with conditional request support
-func fetchLatestRelease(ctx context.Context) (*GitHubRelease, string, error) {
+// fetchLatestRelease calls the GitHub Releases API.
+// conditional 为 true 时携带 If-None-Match ETag 做条件请求（省配额）；
+// 强制检测（force）必须传 false：GitHub /releases/latest 有 CDN 缓存，刚发布新版本后
+// 条件请求可能返回过期的 304 Not Modified，导致强制检测仍拿不到最新发行版。
+func fetchLatestRelease(ctx context.Context, conditional bool) (*GitHubRelease, string, error) {
 	url := githubAPIBase + "/releases/latest"
 
 	req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
@@ -133,9 +136,11 @@ func fetchLatestRelease(ctx context.Context) (*GitHubRelease, string, error) {
 	req.Header.Set("X-GitHub-Api-Version", "2022-11-28")
 
 	// Add ETag for conditional request
-	if etagVal := manager.lastETag.Load(); etagVal != nil {
-		if etag, ok := etagVal.(string); ok && etag != "" {
-			req.Header.Set("If-None-Match", etag)
+	if conditional {
+		if etagVal := manager.lastETag.Load(); etagVal != nil {
+			if etag, ok := etagVal.(string); ok && etag != "" {
+				req.Header.Set("If-None-Match", etag)
+			}
 		}
 	}
 
diff --git a/web/admin/src/views/AdminLayout.vue b/web/admin/src/views/AdminLayout.vue
index 6d93f7f..8b79d79 100644
--- a/web/admin/src/views/AdminLayout.vue
+++ b/web/admin/src/views/AdminLayout.vue
@@ -58,6 +58,7 @@ const updateModalVisible = ref(false)
 const updateLoading = ref(false)
 const executing = ref(false)
 const rollingBack = ref(false)
+const checking = ref(false)
 const updateStatus = ref<any>(null)
 const releaseNotes = ref('')
 const releaseUrl = ref('')
@@ -129,6 +130,16 @@ function openUpdateModal() {
   checkUpdate() // 打开弹窗时刷新版本检查，确保当前版本/最新版本为最新
 }
 
+// 立即检测：force=true 跳过后端检查缓存，强制向上游拉取最新版本信息
+async function manualCheck() {
+  checking.value = true
+  try {
+    await Promise.all([fetchUpdateStatus(), checkUpdate(true)])
+  } finally {
+    checking.value = false
+  }
+}
+
 function closeUpdateModal() {
   updateModalVisible.value = false
   stopPolling()
@@ -717,6 +728,9 @@ onUnmounted(() => {
         <a-result>
           <template #icon><icon-check-circle-fill style="color: #00b42a; font-size: 32px;" /></template>
           <template #title><span style="color: #00b42a; font-size: 14px;">当前已是最新版本</span></template>
+          <template #extra>
+            <a-button size="small" :loading="checking" @click="manualCheck">立即检测</a-button>
+          </template>
         </a-result>
       </template>