diff --git a/proxy.ts b/middleware.ts
similarity index 89%
rename from proxy.ts
rename to middleware.ts
index fcc7722..3cbef69 100644
--- a/proxy.ts
+++ b/middleware.ts
@@ -3,10 +3,11 @@ import type { NextRequest } from 'next/server';
 import { jwtVerify } from 'jose';
 
 const SESSION_COOKIE_NAME = 'logbuch_session';
-const secretKey = process.env.AUTH_SECRET || 'logbuch-secret-change-in-production';
+const secretKey = process.env.AUTH_SECRET;
+if (!secretKey) throw new Error('AUTH_SECRET Umgebungsvariable ist nicht gesetzt!');
 const key = new TextEncoder().encode(secretKey);
 
-export async function proxy(request: NextRequest) {
+export async function middleware(request: NextRequest) {
   const { pathname } = request.nextUrl;
 
   if (pathname.startsWith('/login') || pathname.startsWith('/_next') || pathname.startsWith('/favicon')) {