diff --git a/api/src/main/java/hexagonal/api/member/adapter/out/persistence/MemberPersistenceAdapter.java b/api/src/main/java/hexagonal/api/member/adapter/out/persistence/MemberPersistenceAdapter.java
index 8f548c7..c1b58a6 100644
--- a/api/src/main/java/hexagonal/api/member/adapter/out/persistence/MemberPersistenceAdapter.java
+++ b/api/src/main/java/hexagonal/api/member/adapter/out/persistence/MemberPersistenceAdapter.java
@@ -2,6 +2,7 @@
 
 import hexagonal.api.member.application.port.out.FindMemberPort;
 import hexagonal.api.member.application.port.out.SaveMemberPort;
+import hexagonal.api.member.application.port.out.UpdateMemberPort;
 import hexagonal.core.domain.jpa.MemberJpaEntity;
 import hexagonal.core.repository.MemberRepository;
 import lombok.RequiredArgsConstructor;
@@ -11,21 +12,31 @@
 
 @RequiredArgsConstructor
 @Component
-class MemberPersistenceAdapter implements FindMemberPort, SaveMemberPort {
+class MemberPersistenceAdapter implements FindMemberPort, SaveMemberPort, UpdateMemberPort {
 
     private final MemberRepository memberRepository;
 
     @Override
-    public MemberJpaEntity findMember(String email) {
-        MemberJpaEntity member = memberRepository.findByEmail(email)
+    public MemberJpaEntity findMemberById(Long id) {
+        return memberRepository.findById(id)
                 .orElseThrow(EntityNotFoundException::new);
-        return member;
     }
 
+    @Override
+    public MemberJpaEntity findMemberByEmail(String email) {
+        return memberRepository.findByEmail(email)
+                .orElseThrow(EntityNotFoundException::new);
+    }
 
     @Override
     public Long saveMember(MemberJpaEntity memberJpaEntity) {
         MemberJpaEntity saved = memberRepository.save(memberJpaEntity);
         return saved.getId();
     }
+
+    @Override
+    public Long updateMember(MemberJpaEntity memberJpaEntity) {
+        memberRepository.save(memberJpaEntity);
+        return null;
+    }
 }
diff --git a/api/src/main/java/hexagonal/api/member/application/service/RegisterMemberService.java b/api/src/main/java/hexagonal/api/member/application/service/RegisterMemberService.java
index eea9849..c17ec02 100644
--- a/api/src/main/java/hexagonal/api/member/application/service/RegisterMemberService.java
+++ b/api/src/main/java/hexagonal/api/member/application/service/RegisterMemberService.java
@@ -24,14 +24,12 @@ public Long registerMember(RegisterMemberCommand command) {
         }
         MemberJpaEntity memberJpaEntity = command.toJpaEntity();
         // 모델 상태 조작
-        Long memberId = saveMemberPort.saveMember(memberJpaEntity);
-        // 출력 값 반환
-        return memberId;
+        return saveMemberPort.saveMember(memberJpaEntity);
     }
 
     private boolean checkMemberEmailExists(String email) {
         try {
-            findMemberPort.findMember(email);
+            findMemberPort.findMemberByEmail(email);
         } catch (EntityNotFoundException e) {
             return true;
         }