diff --git a/src/main/java/page/clab/api/domain/member/application/MemberService.java b/src/main/java/page/clab/api/domain/member/application/MemberService.java
index b0c8eab2e..4de503bcb 100644
--- a/src/main/java/page/clab/api/domain/member/application/MemberService.java
+++ b/src/main/java/page/clab/api/domain/member/application/MemberService.java
@@ -229,11 +229,11 @@ private void setRandomPasswordAndSendEmail(Member member) {
     }
 
     private void checkMemberUniqueness(MemberRequestDto requestDto) {
-        if (memberRepository.findById(requestDto.getId()).isPresent())
+        if (memberRepository.existsById(requestDto.getId()))
             throw new DuplicateMemberIdException("이미 사용 중인 아이디입니다.");
-        if (memberRepository.findByContact(requestDto.getContact()).isPresent())
+        if (memberRepository.existsByContact(requestDto.getContact()))
             throw new DuplicateMemberContactException("이미 사용 중인 연락처입니다.");
-        if (memberRepository.findByEmail(requestDto.getEmail()).isPresent())
+        if (memberRepository.existsByEmail(requestDto.getEmail()))
             throw new DuplicateMemberEmailException("이미 사용 중인 이메일입니다.");
     }
 
diff --git a/src/main/java/page/clab/api/domain/member/dao/MemberRepository.java b/src/main/java/page/clab/api/domain/member/dao/MemberRepository.java
index b88d98b6a..2a24bdbf3 100644
--- a/src/main/java/page/clab/api/domain/member/dao/MemberRepository.java
+++ b/src/main/java/page/clab/api/domain/member/dao/MemberRepository.java
@@ -12,7 +12,9 @@
 @Repository
 public interface MemberRepository extends JpaRepository<Member, String>, MemberRepositoryCustom, QuerydslPredicateExecutor<Member> {
 
-    Optional<Member> findByContact(String contact);
+    boolean existsByContact(String contact);
+
+    boolean existsByEmail(String email);
 
     Optional<Object> findByEmail(String email);