diff --git a/src/main/java/com/bookmile/backend/domain/group/controller/GroupController.java b/src/main/java/com/bookmile/backend/domain/group/controller/GroupController.java
index 03b2c11..bd30e54 100644
--- a/src/main/java/com/bookmile/backend/domain/group/controller/GroupController.java
+++ b/src/main/java/com/bookmile/backend/domain/group/controller/GroupController.java
@@ -6,7 +6,6 @@
 import com.bookmile.backend.domain.group.service.GroupService;
 import com.bookmile.backend.domain.group.service.Impl.GroupMemberServiceImpl;
 import com.bookmile.backend.global.common.CommonResponse;
-import com.bookmile.backend.domain.user.entity.User;
 import io.swagger.v3.oas.annotations.Operation;
 import jakarta.validation.Valid;
 import lombok.RequiredArgsConstructor;
@@ -120,9 +119,11 @@ public ResponseEntity<GroupDetailResponseDto> getGroupDetail(@PathVariable Long
     @Operation(summary = "그룹 공개/비공개 전환", description = "그룹장은 그룹 공개여부를 변경할 수 있습니다.")
     public ResponseEntity<CommonResponse<Object>> updateGroupVisibility(
             @PathVariable Long groupId,
-            @RequestBody @Valid GroupPrivateRequestDto requestDto
+            @RequestBody @Valid GroupPrivateRequestDto requestDto,
+            @AuthenticationPrincipal UserDetails userDetails
     ) {
-        groupService.updateGroupPrivate(groupId, requestDto.getIsOpen(), requestDto.getUserId());
+        String userEmail = userDetails.getUsername();
+        groupService.updateGroupPrivate(groupId, requestDto.getIsOpen(), userEmail);
         return ResponseEntity.ok(CommonResponse.from(GROUP_PRIVATE_UPDATE.getMessage()));
     }
 }
diff --git a/src/main/java/com/bookmile/backend/domain/group/dto/req/GroupPrivateRequestDto.java b/src/main/java/com/bookmile/backend/domain/group/dto/req/GroupPrivateRequestDto.java
index 10d978f..a5f5d5d 100644
--- a/src/main/java/com/bookmile/backend/domain/group/dto/req/GroupPrivateRequestDto.java
+++ b/src/main/java/com/bookmile/backend/domain/group/dto/req/GroupPrivateRequestDto.java
@@ -6,6 +6,5 @@
 @Getter
 @NoArgsConstructor
 public class GroupPrivateRequestDto {
-    private Long userId;
     private Boolean isOpen;
 }
\ No newline at end of file
diff --git a/src/main/java/com/bookmile/backend/domain/group/service/GroupService.java b/src/main/java/com/bookmile/backend/domain/group/service/GroupService.java
index c06242c..4b5a5fa 100644
--- a/src/main/java/com/bookmile/backend/domain/group/service/GroupService.java
+++ b/src/main/java/com/bookmile/backend/domain/group/service/GroupService.java
@@ -21,5 +21,5 @@ public interface GroupService {
 
     GroupDetailResponseDto getGroupDetail(Long groupId);
 
-    void updateGroupPrivate(Long groupId, Boolean isOpen, Long userId);
+    void updateGroupPrivate(Long groupId, Boolean isOpen, String userEmail);
 }
diff --git a/src/main/java/com/bookmile/backend/domain/group/service/Impl/GroupServiceImpl.java b/src/main/java/com/bookmile/backend/domain/group/service/Impl/GroupServiceImpl.java
index bd60af2..ca9fff1 100644
--- a/src/main/java/com/bookmile/backend/domain/group/service/Impl/GroupServiceImpl.java
+++ b/src/main/java/com/bookmile/backend/domain/group/service/Impl/GroupServiceImpl.java
@@ -135,10 +135,11 @@ public GroupDetailResponseDto getGroupDetail(Long groupId) {
 
     @Override
     @Transactional
-    public void updateGroupPrivate(Long groupId, Boolean isOpen, Long userId) {
+    public void updateGroupPrivate(Long groupId, Boolean isOpen, String userEmail) {
+        User user = validateUserByEmail(userEmail);
         Group group = findGroupById(groupId);
 
-        UserGroup userGroup = findUserGroupById(userId, groupId);
+        UserGroup userGroup = findUserGroupById(user.getId(), groupId);
         validateGroupMaster(userGroup);
 
         group.setIsOpen(isOpen);