diff --git a/package.json b/package.json
index 5a43464..44e5f3c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "my-weekly-todo-list",
-  "version": "1.51.5",
+  "version": "1.51.6",
   "description": "A web-based weekly task management application that organizes to-dos and calendar events in a single, intuitive weekly view",
   "main": "index.js",
   "scripts": {
diff --git a/src/lib/auth.ts b/src/lib/auth.ts
index e40daa8..9d7c243 100644
--- a/src/lib/auth.ts
+++ b/src/lib/auth.ts
@@ -1,5 +1,4 @@
 import { NextAuthOptions } from "next-auth";
-import type { Adapter } from "next-auth/adapters";
 import GoogleProvider from "next-auth/providers/google";
 import AzureADProvider from "next-auth/providers/azure-ad";
 import AppleProvider from "next-auth/providers/apple";
@@ -8,24 +7,8 @@ import CredentialsProvider from "next-auth/providers/credentials";
 import { compare } from "bcryptjs";
 import { prisma } from "@/lib/prisma";
 
-// Wrap PrismaAdapter to prevent session creation for credentials provider
-// (known NextAuth v4 issue: adapter tries to create DB session even with JWT strategy)
-const prismaAdapter = PrismaAdapter(prisma) as Adapter;
-const adapter: Adapter = {
-  ...prismaAdapter,
-  createUser: prismaAdapter.createUser,
-  getUser: prismaAdapter.getUser,
-  getUserByEmail: prismaAdapter.getUserByEmail,
-  getUserByAccount: prismaAdapter.getUserByAccount,
-  linkAccount: prismaAdapter.linkAccount,
-  createSession: () => { return null as any; },
-  getSessionAndUser: () => { return null as any; },
-  updateSession: () => { return null as any; },
-  deleteSession: () => { return null as any; },
-};
-
 export const authOptions: NextAuthOptions = {
-  adapter,
+  adapter: PrismaAdapter(prisma),
   providers: [
     GoogleProvider({
       clientId: process.env.GOOGLE_CLIENT_ID || "",