diff --git a/src/main/kotlin/com/swm_standard/phote/dto/ExamDtos.kt b/src/main/kotlin/com/swm_standard/phote/dto/ExamDtos.kt
index e510ddc..cf69a4a 100644
--- a/src/main/kotlin/com/swm_standard/phote/dto/ExamDtos.kt
+++ b/src/main/kotlin/com/swm_standard/phote/dto/ExamDtos.kt
@@ -31,7 +31,7 @@ data class ReadExamHistoryListResponse(
 
 data class GradeExamRequest(
     val questionId: UUID,
-    val submittedAnswer: String,
+    val submittedAnswer: String?,
 )
 
 data class GradeExamResponse(