diff --git a/openclaw-version-policy.json b/openclaw-version-policy.json
index e9cf50d..c3bd6e2 100644
--- a/openclaw-version-policy.json
+++ b/openclaw-version-policy.json
@@ -9,10 +9,10 @@
   },
   "default": {
     "official": {
-      "recommended": "2026.5.7"
+      "recommended": "2026.5.12"
     },
     "chinese": {
-      "recommended": "2026.5.7-zh.1"
+      "recommended": "2026.5.12-zh.1"
     }
   },
   "panels": {
diff --git a/scripts/dev-api.js b/scripts/dev-api.js
index 8f8c2f8..854fd39 100644
--- a/scripts/dev-api.js
+++ b/scripts/dev-api.js
@@ -6288,7 +6288,8 @@ const handlers = {
       id: `connect-${idHex}-${rndHex}`,
       method: 'connect',
       params: {
-        minProtocol: 3, maxProtocol: 3,
+        // 协议握手范围声明：下限 3 用于继续兼容历史内核，上限 4 启用新版增量 delta 协议。
+        minProtocol: 3, maxProtocol: 4,
         client: { id: 'openclaw-control-ui', version: '1.0.0', platform, deviceFamily: 'desktop', mode: 'ui' },
         role: 'operator', scopes: SCOPES, caps: [],
         auth: { token: gatewayToken || '' },
diff --git a/src-tauri/src/commands/device.rs b/src-tauri/src/commands/device.rs
index 54a6e82..a953866 100644
--- a/src-tauri/src/commands/device.rs
+++ b/src-tauri/src/commands/device.rs
@@ -138,8 +138,9 @@ pub fn create_connect_frame(
         "id": format!("connect-{:08x}-{:04x}", signed_at as u32, rand::random::<u16>()),
         "method": "connect",
         "params": {
+            // 协议握手范围声明：下限 3 用于继续兼容历史内核，上限 4 启用新版增量 delta 协议。
             "minProtocol": 3,
-            "maxProtocol": 3,
+            "maxProtocol": 4,
             "client": {
                 "id": "openclaw-control-ui",
                 "version": env!("CARGO_PKG_VERSION"),
diff --git a/src/lib/feature-catalog.js b/src/lib/feature-catalog.js
index 19eab1d..59fb1f4 100644
--- a/src/lib/feature-catalog.js
+++ b/src/lib/feature-catalog.js
@@ -189,8 +189,10 @@ export const KERNEL_FLOOR = {
  */
 export const KERNEL_TARGET = {
   openclaw: {
-    official: '2026.5.6',
-    chinese: '2026.5.6-zh.2',
+    // 内核协议在 5.12 升级到 v4（MIN_CLIENT_PROTOCOL_VERSION=4，新增增量 chat delta payloads），
+    // 面板通过 connect frame `[minProtocol=3, maxProtocol=4]` 同时兼容新旧内核
+    official: '2026.5.12',
+    chinese: '2026.5.12-zh.1',
   },
   hermes: {
     default: '0.13.x',
diff --git a/src/pages/chat.js b/src/pages/chat.js
index 3019538..d59048b 100644
--- a/src/pages/chat.js
+++ b/src/pages/chat.js
@@ -1862,7 +1862,10 @@ function handleChatEvent(payload) {
     if (c?.audios?.length) _currentAiAudios = c.audios
     if (c?.files?.length) _currentAiFiles = c.files
     if (c?.tools?.length) _currentAiTools = c.tools
-    if (c?.text && c.text.length > _currentAiText.length) {
+    // 增量 delta 协议下，当输出文本不是前缀扩展时（例如内容回滚或重排），
+    // 对端会带 replace=true，此时新文本可能比当前缓存短，必须无条件覆盖，否则会丢失最新内容。
+    const isReplace = payload.replace === true
+    if (c?.text && (isReplace || c.text.length > _currentAiText.length)) {
       showTyping(false)
       if (!_currentAiBubble) {
         _currentAiBubble = createStreamBubble()