diff --git a/src-electron/main.js b/src-electron/main.js
index 386314bf..b548c491 100644
--- a/src-electron/main.js
+++ b/src-electron/main.js
@@ -78,9 +78,12 @@ function getSrcNodePath() {
 }
 
 // In-memory key-value store shared across all windows (mirrors Tauri's put_item/get_all_items)
-// Used for multi-window storage synchronization
+// Used for multi-window storage synchronization - ONLY for use by storage.js
 const sharedStorageMap = new Map();
 
+// Update scheduled flag - shared across all windows for app updater
+let updateScheduled = false;
+
 // Hidden metrics window for Google Analytics
 let metricsWindow = null;
 
@@ -225,6 +228,40 @@ ipcMain.on('send-health-metric', (event, payload) => {
     }
 });
 
+/**
+ * App updater IPC handlers
+ * These provide low-level APIs for the update-electron.js extension in Phoenix
+ */
+
+// Get app version from config
+ipcMain.handle('get-app-version', (event) => {
+    assertTrusted(event);
+    return version;
+});
+
+// Check if app is packaged (production build)
+ipcMain.handle('is-packaged', (event) => {
+    assertTrusted(event);
+    return app.isPackaged;
+});
+
+// Get executable path (path to the AppImage on Linux)
+ipcMain.handle('get-executable-path', (event) => {
+    assertTrusted(event);
+    return process.execPath;
+});
+
+// Update scheduled state - shared across windows for multi-window update persistence
+ipcMain.handle('set-update-scheduled', (event, scheduled) => {
+    assertTrusted(event);
+    updateScheduled = scheduled;
+});
+
+ipcMain.handle('get-update-scheduled', (event) => {
+    assertTrusted(event);
+    return updateScheduled;
+});
+
 // Handle quit request from renderer
 app.on('quit-requested', (exitCode) => {
     gracefulShutdown(exitCode);
diff --git a/src-electron/package.json b/src-electron/package.json
index 9b312c13..6d3a0c57 100644
--- a/src-electron/package.json
+++ b/src-electron/package.json
@@ -22,4 +22,4 @@
     "electron": "^40.0.0",
     "electron-builder": "^24.13.3"
   }
-}
\ No newline at end of file
+}
diff --git a/src-electron/preload.js b/src-electron/preload.js
index 6ef2ef49..0a2a9a64 100644
--- a/src-electron/preload.js
+++ b/src-electron/preload.js
@@ -79,7 +79,10 @@ contextBridge.exposeInMainWorld('electronAPI', {
     // Set zoom factor on the webview (mirrors Tauri's zoom_window)
     zoomWindow: (scaleFactor) => ipcRenderer.invoke('zoom-window', scaleFactor),
 
-    // In-memory storage for multi-window sync (mirrors Tauri's put_item/get_all_items)
+    /**
+     * In-memory storage for multi-window sync (mirrors Tauri's put_item/get_all_items)
+     * WARNING: These APIs are ONLY for use by storage.js - do not use elsewhere
+     */
     putItem: (key, value) => ipcRenderer.invoke('put-item', key, value),
     getAllItems: () => ipcRenderer.invoke('get-all-items'),
 
@@ -160,5 +163,12 @@ contextBridge.exposeInMainWorld('electronAPI', {
 
     // Health metrics for Google Analytics (sends to hidden metrics window)
     sendHealthMetric: (payload) => ipcRenderer.send('send-health-metric', payload),
-    onHealthMetric: (callback) => ipcRenderer.on('health-metric', (_event, payload) => callback(payload))
+    onHealthMetric: (callback) => ipcRenderer.on('health-metric', (_event, payload) => callback(payload)),
+
+    // App updater APIs - just expose primitives, logic is in update-electron.js
+    getAppVersion: () => ipcRenderer.invoke('get-app-version'),
+    isPackaged: () => ipcRenderer.invoke('is-packaged'),
+    getExecutablePath: () => ipcRenderer.invoke('get-executable-path'),
+    setUpdateScheduled: (scheduled) => ipcRenderer.invoke('set-update-scheduled', scheduled),
+    getUpdateScheduled: () => ipcRenderer.invoke('get-update-scheduled')
 });