diff --git a/server/src/modules/auth/base/auth.service.ts b/server/src/modules/auth/base/auth.service.ts
index 70497de5..0344388e 100644
--- a/server/src/modules/auth/base/auth.service.ts
+++ b/server/src/modules/auth/base/auth.service.ts
@@ -397,17 +397,17 @@ export class AuthService {
       );
     }
 
-    if (userDto.username && !this.isUsernameAllowed(userDto.username)) {
-      throw new HttpException(
-        {
-          status: HttpStatus.UNPROCESSABLE_ENTITY,
-          errors: {
-            username: 'invalid',
-          },
-        },
-        HttpStatus.UNPROCESSABLE_ENTITY
-      );
-    }
+    // if (userDto.username && !this.isUsernameAllowed(userDto.username)) {
+    //   throw new HttpException(
+    //     {
+    //       status: HttpStatus.UNPROCESSABLE_ENTITY,
+    //       errors: {
+    //         username: 'invalid',
+    //       },
+    //     },
+    //     HttpStatus.UNPROCESSABLE_ENTITY
+    //   );
+    // }
 
     await this.sessionService.softDelete({
       user: {
@@ -423,9 +423,9 @@ export class AuthService {
     });
   }
 
-  private isUsernameAllowed(username: string) {
-    return /^[A-Za-z0-9]+$/.test(username);
-  }
+  // private isUsernameAllowed(username: string) {
+  //   return /^[A-Za-z0-9]+$/.test(username);
+  // }
 
   async refreshToken(
     data: Pick<JwtRefreshPayloadType, 'sessionId'>
diff --git a/server/src/modules/auth/base/dto/auth-update.dto.ts b/server/src/modules/auth/base/dto/auth-update.dto.ts
index 606e3e2e..9ef13daa 100644
--- a/server/src/modules/auth/base/dto/auth-update.dto.ts
+++ b/server/src/modules/auth/base/dto/auth-update.dto.ts
@@ -1,5 +1,6 @@
 import { ApiProperty } from '@nestjs/swagger';
 import {
+  IsAlphanumeric,
   IsArray,
   IsIn,
   IsNotEmpty,
@@ -43,6 +44,7 @@ export class AuthUpdateDto {
   @Validate(IsNotExist, ['User'], {
     message: 'usernameAlreadyExists',
   })
+  @IsAlphanumeric()
   username?: string | null;
 
   @ApiProperty()