diff --git a/src/main/java/ceos/backend/domain/application/helper/ApplicationHelper.java b/src/main/java/ceos/backend/domain/application/helper/ApplicationHelper.java
index 34ed804..5c319b0 100644
--- a/src/main/java/ceos/backend/domain/application/helper/ApplicationHelper.java
+++ b/src/main/java/ceos/backend/domain/application/helper/ApplicationHelper.java
@@ -57,6 +57,15 @@ public Application getApplicationById(Long id) {
                         });
     }
 
+    public Application getApplicationByIdForUpdate(Long id) {
+        return applicationRepository
+                .findByIdWithPessimisticLock(id)
+                .orElseThrow(
+                        () -> {
+                            throw ApplicantNotFound.EXCEPTION;
+                        });
+    }
+
     public Application getApplicationByUuidAndEmail(String uuid, String email) {
         return applicationRepository
                 .findByUuidAndEmail(uuid, email)
diff --git a/src/main/java/ceos/backend/domain/application/repository/ApplicationRepository.java b/src/main/java/ceos/backend/domain/application/repository/ApplicationRepository.java
index 18a0b86..c1f7544 100644
--- a/src/main/java/ceos/backend/domain/application/repository/ApplicationRepository.java
+++ b/src/main/java/ceos/backend/domain/application/repository/ApplicationRepository.java
@@ -5,9 +5,12 @@
 import ceos.backend.domain.application.domain.Pass;
 import ceos.backend.global.common.entity.Part;
 import java.util.Optional;
+
+import jakarta.persistence.LockModeType;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.PageRequest;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Lock;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.query.Param;
 
@@ -63,4 +66,10 @@ Page<Application> findAllByPartAndDocumentPassAndFinalPass(
             @Param("convertedDocPass") Pass convertedDocPass,
             @Param("convertedFinalPass") Pass convertedFinalPass,
             PageRequest pageRequest);
+
+
+    @Lock(LockModeType.PESSIMISTIC_WRITE)
+    @Query("select a from Application a where a.id = :id")
+    Optional<Application> findByIdWithPessimisticLock(@Param("id") Long id);
+
 }
diff --git a/src/main/java/ceos/backend/domain/application/service/ApplicationService.java b/src/main/java/ceos/backend/domain/application/service/ApplicationService.java
index 5d421d7..80b69e6 100644
--- a/src/main/java/ceos/backend/domain/application/service/ApplicationService.java
+++ b/src/main/java/ceos/backend/domain/application/service/ApplicationService.java
@@ -237,7 +237,7 @@ public GetInterviewTime getInterviewTime(Long applicationId) {
     public void updateInterviewTime(Long applicationId, UpdateInterviewTime updateInterviewTime) {
         recruitmentValidator.validateBetweenStartDateDocAndResultDateDoc(); // 기간 검증
         applicationValidator.validateExistingApplicant(applicationId); // 유저 검증
-        final Application application = applicationHelper.getApplicationById(applicationId);
+        final Application application = applicationHelper.getApplicationByIdForUpdate(applicationId);
         applicationValidator.validateDocumentPassStatus(application); // 서류 통과 검증
         final List<Interview> interviews = interviewRepository.findAll();
         final String duration =
@@ -262,7 +262,7 @@ public void updateDocumentPassStatus(Long applicationId, UpdatePassStatus update
         recruitmentValidator.validateBetweenStartDateDocAndResultDateDoc(); // 기간 검증
         applicationValidator.validateExistingApplicant(applicationId); // 유저 검증
 
-        final Application application = applicationHelper.getApplicationById(applicationId);
+        final Application application = applicationHelper.getApplicationByIdForUpdate(applicationId);
         application.updateDocumentPass(updatePassStatus.getPass());
     }
 
@@ -270,7 +270,7 @@ public void updateDocumentPassStatus(Long applicationId, UpdatePassStatus update
     public void updateFinalPassStatus(Long applicationId, UpdatePassStatus updatePassStatus) {
         recruitmentValidator.validateBetweenResultDateDocAndResultDateFinal(); // 기간 검증
         applicationValidator.validateExistingApplicant(applicationId); // 유저 검증
-        final Application application = applicationHelper.getApplicationById(applicationId);
+        final Application application = applicationHelper.getApplicationByIdForUpdate(applicationId);
         applicationValidator.validateDocumentPassStatus(application); // 서류 통과 검증
 
         application.updateFinalPass(updatePassStatus.getPass());