diff --git a/README.md b/README.md
index bb24c6a..983875b 100644
--- a/README.md
+++ b/README.md
@@ -631,6 +631,11 @@ data: [DONE]
 
 ## Changelog
 
+### v3.3.1 (2026-05-21)
+- **HTML Preview** — HTML code blocks no longer render inside chat and break the flow
+- Added sandboxed iframe preview panel with Preview button
+- Added Open in Browser button for full-screen HTML preview
+
 ### v3.3.0 (2026-05-21)
 - **File Manager** — browse device files (App Files, Downloads, Camera, Storage), open/preview any file, install APKs directly
 - **SSH / Remote Access** — AI can SSH into external machines, SCP upload/download, curl URLs
diff --git a/android/app/build.gradle b/android/app/build.gradle
index a048e74..d29cc74 100644
--- a/android/app/build.gradle
+++ b/android/app/build.gradle
@@ -21,8 +21,8 @@ android {
         applicationId "ai.z.chat"
         minSdkVersion rootProject.ext.minSdkVersion
         targetSdkVersion rootProject.ext.targetSdkVersion
-        versionCode 25
-        versionName "3.3.0"
+        versionCode 26
+        versionName "3.3.1"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         aaptOptions {
             ignoreAssetsPattern = '!.svn:!.git:!.ds_store:!*.scc:.*:!CVS:!thumbs.db:!picasa.ini:!*~'
diff --git a/package.json b/package.json
index ef7143d..4ae9b7c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "zai-chat",
-  "version": "3.3.0",
+  "version": "3.3.1",
   "description": "Z.AI Chat - Full stack AI chat powered by GLM Coding Plan",
   "main": "index.js",
   "scripts": {
diff --git a/www/index.html b/www/index.html
index 9538049..6aa9f27 100644
--- a/www/index.html
+++ b/www/index.html
@@ -354,7 +354,7 @@
                     </div>
                     <div class="settings-section">
                         <h3>About</h3>
-                         <p class="about-text">Z.AI Chat v3.3.0</p>
+                         <p class="about-text">Z.AI Chat v3.3.1</p>
                         <p class="about-text">Built with Z.AI SDK &amp; GLM-5.1</p>
                         <p class="about-text">Compatible with Android 15/16</p>
                     </div>
@@ -362,6 +362,11 @@
                         <h3>Changelog</h3>
                         <ul class="changelog-list">
                             <li>
+                                <span class="changelog-version">v3.3.1</span>
+                                <span class="changelog-date">2026-05-21</span>
+                                <ul>
+                                    <li><strong>HTML Preview</strong> — HTML code blocks no longer break chat; sandboxed iframe preview with Open in Browser</li>
+                                </ul>
                                 <span class="changelog-version">v3.3.0</span>
                                 <span class="changelog-date">2026-05-21</span>
                                 <ul>
diff --git a/www/js/app.js b/www/js/app.js
index 520cf95..45192ba 100644
--- a/www/js/app.js
+++ b/www/js/app.js
@@ -3240,7 +3240,7 @@
                 termState.projectsDir = env.PROJECTS;
                 termState.cwd = env.CWD || env.HOME;
                 updateCwdDisplay();
-                termPrint('Z.AI Terminal v3.3.0', 'info');
+                termPrint('Z.AI Terminal v3.3.1', 'info');
                 termPrint('Home: ' + termState.homeDir, 'info');
                 termPrint('Type "help" for commands, "setup" for dev tools\n', 'info');
             }).catch(function() {});