diff --git a/src/main/java/com/kamco/cd/kamcoback/Innopam/dto/DetectMastDto.java b/src/main/java/com/kamco/cd/kamcoback/Innopam/dto/DetectMastDto.java
index 3ec944e7..3a4a7e7e 100644
--- a/src/main/java/com/kamco/cd/kamcoback/Innopam/dto/DetectMastDto.java
+++ b/src/main/java/com/kamco/cd/kamcoback/Innopam/dto/DetectMastDto.java
@@ -2,6 +2,7 @@ package com.kamco.cd.kamcoback.Innopam.dto;
 
 import io.swagger.v3.oas.annotations.media.Schema;
 import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotNull;
 import lombok.AllArgsConstructor;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
@@ -38,7 +39,7 @@ public class DetectMastDto {
     @Schema(description = "after 연도", example = "2024")
     private String cprsAdYr;
 
-    @NotBlank
+    @NotNull
     @Schema(description = "차수(회차)", example = "4")
     private Integer dtctSno;