diff --git a/operation-api/src/main/java/org/sopt/makers/operation/web/alarm/service/AlarmServiceImpl.java b/operation-api/src/main/java/org/sopt/makers/operation/web/alarm/service/AlarmServiceImpl.java
index a4bfa703..e90a6a1e 100644
--- a/operation-api/src/main/java/org/sopt/makers/operation/web/alarm/service/AlarmServiceImpl.java
+++ b/operation-api/src/main/java/org/sopt/makers/operation/web/alarm/service/AlarmServiceImpl.java
@@ -24,6 +24,7 @@
 
 import org.sopt.makers.operation.web.alarm.dto.request.AlarmInstantSendRequest;
 import org.sopt.makers.operation.web.alarm.dto.request.AlarmScheduleSendRequest;
+import org.sopt.makers.operation.web.alarm.dto.request.AlarmScheduleStatusUpdateRequest;
 import org.sopt.makers.operation.web.alarm.dto.response.AlarmGetResponse;
 import org.sopt.makers.operation.web.alarm.dto.response.AlarmCreateResponse;
 import org.sopt.makers.operation.web.alarm.dto.response.AlarmListGetResponse;
@@ -91,6 +92,12 @@ public void deleteAlarm(long alarmId) {
         alarmRepository.delete(alarm);
     }
 
+    @Override
+    public void updateScheduleAlarm(long alarmId, AlarmScheduleStatusUpdateRequest request) {
+        val alarm = findAlarm(alarmId);
+        alarm.updateStatusToComplete(request.sendAt());
+    }
+
     private Alarm findAlarm(long id) {
         return alarmRepository.findById(id)
                 .orElseThrow(() -> new AlarmException(NOT_FOUND_ALARM));