diff --git a/appcast-prerelease.xml b/appcast-prerelease.xml
index 3c0fb1b3..a29d63ac 100644
--- a/appcast-prerelease.xml
+++ b/appcast-prerelease.xml
@@ -5,6 +5,62 @@
         <link>https://github.com/amantus-ai/vibetunnel</link>
         <description>VibeTunnel pre-release and beta updates feed</description>
         <language>en</language>
+        <item>
+            <title>VibeTunnel 1.0.0-beta.12</title>
+            <link>https://github.com/amantus-ai/vibetunnel/releases/download/v1.0.0-beta.12/VibeTunnel-1.0.0-beta.12.dmg</link>
+            <sparkle:version>201</sparkle:version>
+            <sparkle:shortVersionString>1.0.0-beta.12</sparkle:shortVersionString>
+            <description><![CDATA[
+                <h2>VibeTunnel 1.0.0-beta.12</h2>
+                <p><strong>Pre-release version</strong></p>
+                
+                <h4>Welcome Screen Performance</h4>
+                <ul>
+                <li>Background folder scanning eliminates UI freeze when opening the welcome screen (#394)</li>
+                <li>Improved startup performance with optimized web directory structure</li>
+                <li>Much smoother experience when working with large project directories</li>
+                </ul>
+                
+                <h4>SSH Agent Reliability</h4>
+                <ul>
+                <li>Fixed SSH key generation errors on non-localhost HTTP connections (#392)</li>
+                <li>SSH agent now works correctly when accessing VibeTunnel via ngrok or from another device</li>
+                <li>Improved security and reliability for remote access scenarios</li>
+                </ul>
+                
+                <h4>npm Package Stability</h4>
+                <ul>
+                <li>Fixed critical installation issues on Linux systems (#393)</li>
+                <li><code>authenticate-pam</code> now properly handled as optional dependency</li>
+                <li>Enhanced cross-platform compatibility for Ubuntu and other distributions</li>
+                <li>Comprehensive vt command tests ensure reliability across environments</li>
+                </ul>
+                
+                <h4>Developer Experience</h4>
+                <ul>
+                <li>Fixed missing public directory in Mac app bundle (#392)</li>
+                <li>Resolved TypeScript type annotations throughout codebase</li>
+                <li>Improved lint compliance and code quality</li>
+                <li>Streamlined CI/CD workflow for more reliable builds</li>
+                </ul>
+                
+                <h3>🐛 Bug Fixes</h3>
+                <ul>
+                <li>Fixed vt command syntax errors on Linux systems (#393)</li>
+                <li>Fixed welcome screen lag during folder scanning (#394)</li>
+                <li>Resolved missing icons and resources in Mac app</li>
+                <li>Fixed lint and type errors across the codebase</li>
+                <li>Cleaned up duplicate and stray files from web directory</li>
+                </ul>
+            ]]></description>
+            <pubDate>Thu, 17 Jul 2025 19:35:43 +0200</pubDate>
+            <enclosure url="https://github.com/amantus-ai/vibetunnel/releases/download/v1.0.0-beta.12/VibeTunnel-1.0.0-beta.12.dmg" 
+                       sparkle:version="201" 
+                       sparkle:shortVersionString="1.0.0-beta.12" 
+                       length="51126870" 
+                       type="application/x-apple-diskimage" 
+                       sparkle:edSignature="anyeSJmQ36B3lPaQmsWbVPKZMbn9Fk+hBXHK1/ghHzOoEWGLO32DsreDdr5tmBBEwRIlI7019byHkcmAFYSxBg=="/>
+        </item>
         <item>
             <title>VibeTunnel 1.0.0-beta.11</title>
             <link>https://github.com/amantus-ai/vibetunnel/releases/download/v1.0.0-beta.11/VibeTunnel-1.0.0-beta.11.dmg</link>