diff --git a/package.json b/package.json
index 976260c..24341d8 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "markdown-converter",
-  "version": "3.0.0",
+  "version": "4.0.0",
   "description": "Professional Markdown editor and universal file converter with PDF editing, batch processing, and syntax highlighting",
   "main": "src/main.js",
   "scripts": {
diff --git a/src/index.html b/src/index.html
index 5fc5299..9de8ca1 100644
--- a/src/index.html
+++ b/src/index.html
@@ -21,7 +21,7 @@
                 <span class="app-title">MarkdownConverter</span>
             </div>
             <div class="app-header-right">
-                <span class="app-version">v3.0.0</span>
+                <span class="app-version">v4.0.0</span>
             </div>
         </div>
         <div class="tab-bar" id="tab-bar">