diff --git a/apps/stage-tamagotchi/src/main/services/electron/auto-updater.ts b/apps/stage-tamagotchi/src/main/services/electron/auto-updater.ts
index 5c1cd2e6b..182788c98 100644
--- a/apps/stage-tamagotchi/src/main/services/electron/auto-updater.ts
+++ b/apps/stage-tamagotchi/src/main/services/electron/auto-updater.ts
@@ -4,6 +4,8 @@ import type { UpdateInfo } from 'electron-updater'
 
 import type { AutoUpdaterState } from '../../../shared/eventa'
 
+import { arch } from 'node:process'
+
 import electronUpdater from 'electron-updater'
 
 import { is } from '@electron-toolkit/utils'
@@ -21,6 +23,7 @@ import {
 import { MockAutoUpdater } from './mock-auto-updater'
 
 export interface AppUpdaterLike {
+  channel?: string
   on: (event: string, listener: (...args: any[]) => void) => any
   checkForUpdates: () => Promise<any>
   downloadUpdate: () => Promise<any>
@@ -59,6 +62,10 @@ export function setupAutoUpdater(): AutoUpdater {
   let state: AutoUpdaterState = { status: 'idle' }
   const hooks = new Set<(state: AutoUpdaterState) => void>()
 
+  // Fix: explicitly map base channel to architecture to resolve 404 targets.
+  // electron-updater natively appends OS suffixes (-mac.yml, -linux.yml) automatically.
+  autoUpdater.channel = arch === 'arm64' ? 'latest-arm64' : 'latest-x64'
+
   function broadcast(next: AutoUpdaterState) {
     state = next