diff --git a/apps/backend/apps/client/src/submission/class/create-submission.dto.ts b/apps/backend/apps/client/src/submission/class/create-submission.dto.ts
index c793f5826c..e4579e2051 100644
--- a/apps/backend/apps/client/src/submission/class/create-submission.dto.ts
+++ b/apps/backend/apps/client/src/submission/class/create-submission.dto.ts
@@ -1,8 +1,10 @@
 import { Language } from '@prisma/client'
 import { Type } from 'class-transformer'
 import {
+  IsArray,
   IsBoolean,
   IsEnum,
+  IsInt,
   IsNotEmpty,
   IsNumber,
   IsString,
@@ -39,6 +41,22 @@ export class CreateSubmissionDto {
 }
 
 export class CreateUserTestSubmissionDto extends CreateSubmissionDto {
+  @IsArray()
+  @ValidateNested({ each: true })
+  @Type(() => UserTestcase)
+  userTestcases: UserTestcase[]
+}
+
+export class UserTestcase {
+  @IsInt()
+  @IsNotEmpty()
+  id: number;
+
+  @IsString()
+  @IsNotEmpty()
+  in: string
+
+  @IsString()
   @IsNotEmpty()
-  userTestcases: { id: number; in: string; out: string }[]
+  out: string
 }
diff --git a/apps/backend/apps/client/src/submission/submission.controller.ts b/apps/backend/apps/client/src/submission/submission.controller.ts
index e71b0e74d8..7f2c98b678 100644
--- a/apps/backend/apps/client/src/submission/submission.controller.ts
+++ b/apps/backend/apps/client/src/submission/submission.controller.ts
@@ -18,7 +18,7 @@ import {
 } from '@libs/pipe'
 import {
   CreateSubmissionDto,
-  type CreateUserTestSubmissionDto
+  CreateUserTestSubmissionDto
 } from './class/create-submission.dto'
 import { SubmissionService } from './submission.service'