diff --git a/apps/desktop/package.json b/apps/desktop/package.json
index 439087d..53c1977 100644
--- a/apps/desktop/package.json
+++ b/apps/desktop/package.json
@@ -3,6 +3,9 @@
   "private": true,
   "version": "0.1.0",
   "type": "module",
+  "engines": {
+    "node": "22.x"
+  },
   "scripts": {
     "dev": "vite",
     "build": "vite build",
diff --git a/apps/desktop/vercel.json b/apps/desktop/vercel.json
index ffe214b..511a10d 100644
--- a/apps/desktop/vercel.json
+++ b/apps/desktop/vercel.json
@@ -5,7 +5,6 @@
   "outputDirectory": "dist",
   "functions": {
     "api/**/*.ts": {
-      "runtime": "nodejs22.x",
       "maxDuration": 30
     }
   },
diff --git a/docs/dev/desktop-vercel-github-backend.md b/docs/dev/desktop-vercel-github-backend.md
index 7ed1c6d..d302683 100644
--- a/docs/dev/desktop-vercel-github-backend.md
+++ b/docs/dev/desktop-vercel-github-backend.md
@@ -11,7 +11,7 @@ Scope:
 
 `apps/desktop/vercel.json` configures:
 - Vite static build output (`dist`)
-- Node.js Vercel Functions for `api/**/*.ts`
+- Node.js Vercel Functions for `api/**/*.ts` (duration only; runtime version is read from `apps/desktop/package.json` `engines.node`)
 - Explicit routed API endpoints:
   - `/api/auth/github/start`
   - `/api/auth/github/callback`