diff --git a/api-v3/src/auth/dto/mobile-refresh.dto.ts b/api-v3/src/auth/dto/mobile-refresh.dto.ts
new file mode 100644
index 0000000..a3794e7
--- /dev/null
+++ b/api-v3/src/auth/dto/mobile-refresh.dto.ts
@@ -0,0 +1,8 @@
+import { IsString, MaxLength, MinLength } from 'class-validator';
+
+export class MobileRefreshDto {
+  @IsString()
+  @MinLength(32)
+  @MaxLength(256)
+  refreshToken!: string;
+}