diff --git a/examples/Directory.Packages.props b/examples/Directory.Packages.props
index c37a18d57..4a30fac0b 100644
--- a/examples/Directory.Packages.props
+++ b/examples/Directory.Packages.props
@@ -2,7 +2,7 @@
 	<PropertyGroup>
 		<!-- Enable Central Package Management -->
 		<ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
-		<TouchSocketVersion>4.0.0-rc.51</TouchSocketVersion>
+		<TouchSocketVersion>4.0.0</TouchSocketVersion>
 	</PropertyGroup>
 
 	<!-- Centralized Package Version Management -->
diff --git a/handbook/docusaurus.config.ts b/handbook/docusaurus.config.ts
index edd1892f1..15dccbe3c 100644
--- a/handbook/docusaurus.config.ts
+++ b/handbook/docusaurus.config.ts
@@ -41,10 +41,10 @@ const config = {
           showLastUpdateAuthor: true,
           sidebarCollapsible: true,
           sidebarCollapsed: true,
-          lastVersion: '3.1',
+          lastVersion: 'current',
           versions: {
             current: {
-              label: '4.0-rc',
+              label: '4.0',
               path: '/current',
             },
             // next: {
diff --git a/handbook/src/components/CoursePromotionModal.module.css b/handbook/src/components/CoursePromotionModal.module.css
new file mode 100644
index 000000000..0cde3486d
--- /dev/null
+++ b/handbook/src/components/CoursePromotionModal.module.css
@@ -0,0 +1,292 @@
+/* 遮罩层 */
+.overlay {
+  position: fixed;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  background: rgba(0, 0, 0, 0.5);
+  z-index: 9998;
+  backdrop-filter: blur(2px);
+}
+
+/* 弹窗容器 */
+.modal {
+  position: fixed;
+  top: 50%;
+  left: 50%;
+  transform: translate(-50%, -50%);
+  background: white;
+  border-radius: 16px;
+  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
+  z-index: 9999;
+  min-width: 320px;
+  max-width: 500px;
+  width: 90%;
+  animation: modalSlideIn 0.3s ease-out;
+}
+
+@keyframes modalSlideIn {
+  from {
+    opacity: 0;
+    transform: translate(-50%, -60%);
+  }
+  to {
+    opacity: 1;
+    transform: translate(-50%, -50%);
+  }
+}
+
+/* 头部 */
+.header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  padding: 20px 24px 0;
+  border-bottom: none;
+}
+
+.title {
+  margin: 0;
+  font-size: 18px;
+  font-weight: 600;
+  color: #1a1a1a;
+  line-height: 1.4;
+}
+
+.closeButton {
+  background: none;
+  border: none;
+  font-size: 24px;
+  color: #999;
+  cursor: pointer;
+  padding: 4px;
+  border-radius: 4px;
+  transition: all 0.2s ease;
+}
+
+.closeButton:hover {
+  background: #f5f5f5;
+  color: #666;
+}
+
+/* 内容区域 */
+.content {
+  padding: 16px 24px;
+  text-align: center;
+  position: relative;
+}
+
+.badge {
+  position: absolute;
+  top: 0;
+  right: 24px;
+  background: linear-gradient(135deg, #ff6b6b 0%, #ee5a6f 100%);
+  color: white;
+  padding: 4px 12px;
+  border-radius: 12px;
+  font-size: 12px;
+  font-weight: 600;
+  box-shadow: 0 2px 8px rgba(255, 107, 107, 0.3);
+}
+
+.icon {
+  font-size: 48px;
+  margin-bottom: 16px;
+  line-height: 1;
+}
+
+.message {
+  font-size: 16px;
+  line-height: 1.6;
+  color: #333;
+  margin: 0 0 20px;
+}
+
+.priceSection {
+  margin: 20px 0;
+  padding: 16px;
+  background: linear-gradient(135deg, #fff9e6 0%, #ffe6e6 100%);
+  border-radius: 12px;
+}
+
+.originalPrice {
+  font-size: 14px;
+  color: #999;
+  text-decoration: line-through;
+  margin-bottom: 8px;
+}
+
+.promotionPrice {
+  font-size: 18px;
+  color: #333;
+  font-weight: 600;
+}
+
+.price {
+  font-size: 32px;
+  color: #ff6b6b;
+  font-weight: 700;
+}
+
+.countdown {
+  margin: 16px 0;
+  padding: 12px;
+  background: #f8f9fa;
+  border-radius: 8px;
+  border: 1px solid #e9ecef;
+}
+
+.countdownLabel {
+  font-size: 14px;
+  color: #666;
+  margin-bottom: 8px;
+}
+
+.countdownTime {
+  font-size: 18px;
+  font-weight: 700;
+  color: #ff6b6b;
+  font-family: 'Courier New', monospace;
+}
+
+.description {
+  font-size: 14px;
+  line-height: 1.5;
+  color: #666;
+  margin: 12px 0 0;
+}
+
+/* 按钮区域 */
+.actions {
+  display: flex;
+  gap: 12px;
+  padding: 0 24px 24px;
+}
+
+.viewButton {
+  flex: 1;
+  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+  color: white;
+  border: none;
+  padding: 12px 24px;
+  border-radius: 8px;
+  font-size: 15px;
+  font-weight: 500;
+  cursor: pointer;
+  transition: all 0.3s ease;
+  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
+}
+
+.viewButton:hover {
+  transform: translateY(-1px);
+  box-shadow: 0 6px 16px rgba(102, 126, 234, 0.4);
+}
+
+.viewButton:active {
+  transform: translateY(0);
+}
+
+.laterButton {
+  flex: 0.8;
+  background: #f8f9fa;
+  color: #666;
+  border: 1px solid #e9ecef;
+  padding: 12px 20px;
+  border-radius: 8px;
+  font-size: 14px;
+  cursor: pointer;
+  transition: all 0.2s ease;
+}
+
+.laterButton:hover {
+  background: #e9ecef;
+  color: #495057;
+}
+
+/* 暗色主题适配 */
+[data-theme='dark'] .modal {
+  background: #2a2a2a;
+  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
+}
+
+[data-theme='dark'] .title {
+  color: #ffffff;
+}
+
+[data-theme='dark'] .message {
+  color: #e0e0e0;
+}
+
+[data-theme='dark'] .priceSection {
+  background: linear-gradient(135deg, #3a3a2a 0%, #3a2a2a 100%);
+}
+
+[data-theme='dark'] .promotionPrice {
+  color: #e0e0e0;
+}
+
+[data-theme='dark'] .countdown {
+  background: #404040;
+  border-color: #555;
+}
+
+[data-theme='dark'] .countdownLabel {
+  color: #b0b0b0;
+}
+
+[data-theme='dark'] .description {
+  color: #b0b0b0;
+}
+
+[data-theme='dark'] .closeButton {
+  color: #b0b0b0;
+}
+
+[data-theme='dark'] .closeButton:hover {
+  background: #404040;
+  color: #e0e0e0;
+}
+
+[data-theme='dark'] .laterButton {
+  background: #404040;
+  color: #b0b0b0;
+  border-color: #555;
+}
+
+[data-theme='dark'] .laterButton:hover {
+  background: #4a4a4a;
+  color: #e0e0e0;
+}
+
+/* 移动端适配 */
+@media (max-width: 480px) {
+  .modal {
+    margin: 20px;
+    width: calc(100% - 40px);
+  }
+  
+  .title {
+    font-size: 16px;
+  }
+  
+  .message {
+    font-size: 15px;
+  }
+
+  .price {
+    font-size: 28px;
+  }
+
+  .countdownTime {
+    font-size: 16px;
+  }
+  
+  .actions {
+    flex-direction: column;
+  }
+  
+  .laterButton {
+    flex: 1;
+  }
+}
diff --git a/handbook/src/components/CoursePromotionModal.tsx b/handbook/src/components/CoursePromotionModal.tsx
new file mode 100644
index 000000000..b99d38657
--- /dev/null
+++ b/handbook/src/components/CoursePromotionModal.tsx
@@ -0,0 +1,112 @@
+import React, { useState, useEffect } from 'react';
+import styles from './CoursePromotionModal.module.css';
+
+const CoursePromotionModal: React.FC = () => {
+  const [isVisible, setIsVisible] = useState(false);
+  const [timeLeft, setTimeLeft] = useState('');
+
+  useEffect(() => {
+    // 检查当前会话是否已经显示过弹窗（使用 sessionStorage 记录）
+    const hasShownModal = sessionStorage.getItem('course-promotion-modal-shown-2025-11');
+    
+    if (!hasShownModal) {
+      // 延迟显示弹窗，让页面先加载完成
+      const timer = setTimeout(() => {
+        setIsVisible(true);
+      }, 1000);
+
+      return () => clearTimeout(timer);
+    }
+  }, []);
+
+  useEffect(() => {
+    // 计算倒计时
+    const updateCountdown = () => {
+      const endDate = new Date('2025-11-26T23:59:59');
+      const now = new Date();
+      const diff = endDate.getTime() - now.getTime();
+
+      if (diff <= 0) {
+        setTimeLeft('活动已结束');
+        return;
+      }
+
+      const days = Math.floor(diff / (1000 * 60 * 60 * 24));
+      const hours = Math.floor((diff % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
+      const minutes = Math.floor((diff % (1000 * 60 * 60)) / (1000 * 60));
+      const seconds = Math.floor((diff % (1000 * 60)) / 1000);
+
+      setTimeLeft(`${days}天 ${hours}小时 ${minutes}分 ${seconds}秒`);
+    };
+
+    updateCountdown();
+    const interval = setInterval(updateCountdown, 1000);
+
+    return () => clearInterval(interval);
+  }, []);
+
+  const handleClose = () => {
+    setIsVisible(false);
+    // 记录当前会话已显示过弹窗，刷新页面后会重新显示
+    sessionStorage.setItem('course-promotion-modal-shown-2025-11', 'true');
+  };
+
+  const handleViewCourse = () => {
+    // 在新窗口打开课程链接
+    window.open('https://www.bilibili.com/cheese/play/ss489296905', '_blank');
+    handleClose();
+  };
+
+  if (!isVisible) return null;
+
+  return (
+    <>
+      {/* 遮罩层 */}
+      <div className={styles.overlay} onClick={handleClose} />
+      
+      {/* 弹窗内容 */}
+      <div className={styles.modal}>
+        <div className={styles.header}>
+          <h3 className={styles.title}>🎉 TouchSocket 4.0 正式版发布！</h3>
+          <button className={styles.closeButton} onClick={handleClose}>
+            ×
+          </button>
+        </div>
+        
+        <div className={styles.content}>
+          <div className={styles.badge}>限时优惠</div>
+          <div className={styles.icon}>🎓</div>
+          <p className={styles.message}>
+            为庆祝 <strong>TouchSocket 4.0 正式版</strong>发布，
+            官方课程现已开启限时特惠！
+          </p>
+          
+          <div className={styles.priceSection}>
+            <div className={styles.originalPrice}>原价: ¥358</div>
+            <div className={styles.promotionPrice}>限时优惠价: <span className={styles.price}>¥198</span></div>
+          </div>
+
+          <div className={styles.countdown}>
+            <div className={styles.countdownLabel}>⏰ 距离活动结束还剩：</div>
+            <div className={styles.countdownTime}>{timeLeft}</div>
+          </div>
+
+          <p className={styles.description}>
+            活动时间：2025.11.23 - 2025.11.26
+          </p>
+        </div>
+        
+        <div className={styles.actions}>
+          <button className={styles.viewButton} onClick={handleViewCourse}>
+            🚀 立即查看课程
+          </button>
+          <button className={styles.laterButton} onClick={handleClose}>
+            稍后再说
+          </button>
+        </div>
+      </div>
+    </>
+  );
+};
+
+export default CoursePromotionModal;
diff --git a/handbook/src/components/VotingModal.tsx b/handbook/src/components/VotingModal.tsx
index 51dd8f2b5..bbbb6d503 100644
--- a/handbook/src/components/VotingModal.tsx
+++ b/handbook/src/components/VotingModal.tsx
@@ -2,6 +2,10 @@ import React, { useState, useEffect } from 'react';
 import styles from './VotingModal.module.css';
 
 const VotingModal: React.FC = () => {
+  // 暂时禁用该弹窗
+  return null;
+  
+  // eslint-disable-next-line no-unreachable
   const [isVisible, setIsVisible] = useState(false);
 
   useEffect(() => {
diff --git a/handbook/src/pages/upgrade/index.mdx b/handbook/src/pages/upgrade/index.mdx
index c0d8d7a4d..f09f359a2 100644
--- a/handbook/src/pages/upgrade/index.mdx
+++ b/handbook/src/pages/upgrade/index.mdx
@@ -10,11 +10,7 @@ import Highlight from '@site/src/components/Highlight.js';
 
 ## v4.0
 
-**更新日期：** 
-
-暂未发布正式版，Nuget请勾选预发布版本可以尝鲜更新。
-
-目前4.0版本已进入RC（发布候选）阶段，一般API基本不会再变动。正式版计划在2025年12月左右，随`.NET10`发布正式版。
+**更新日期：** 2025.11.23
 
 **更新描述：**
 
diff --git a/handbook/src/theme/Root.tsx b/handbook/src/theme/Root.tsx
index 0f83f41f0..beff7cf85 100644
--- a/handbook/src/theme/Root.tsx
+++ b/handbook/src/theme/Root.tsx
@@ -1,5 +1,6 @@
 import React from 'react';
 import VotingModal from '../components/VotingModal';
+import CoursePromotionModal from '../components/CoursePromotionModal';
 
 // 包装原始的 Root 组件并添加我们的弹窗
 export default function Root({ children }) {
@@ -7,6 +8,7 @@ export default function Root({ children }) {
     <>
       {children}
       <VotingModal />
+      <CoursePromotionModal />
     </>
   );
 }
\ No newline at end of file