diff --git a/src/main/java/com/api/trip/common/sse/emitter/SseEmitterMap.java b/src/main/java/com/api/trip/common/sse/emitter/SseEmitterMap.java
index c45455d..4664b2a 100644
--- a/src/main/java/com/api/trip/common/sse/emitter/SseEmitterMap.java
+++ b/src/main/java/com/api/trip/common/sse/emitter/SseEmitterMap.java
@@ -15,22 +15,22 @@
 @Slf4j
 public class SseEmitterMap {
 
-    private final Map<Long, SseEmitter> sseEmitterMap = new ConcurrentHashMap<>();
+    private final Map<String, SseEmitter> sseEmitterMap = new ConcurrentHashMap<>();
 
-    public void put(Long memberId, SseEmitter sseEmitter) {
-        sseEmitter.onCompletion(() -> remove(memberId));
+    public void put(String email, SseEmitter sseEmitter) {
+        sseEmitter.onCompletion(() -> remove(email));
         sseEmitter.onTimeout(sseEmitter::complete);
-        sseEmitterMap.put(memberId, sseEmitter);
-        log.info("connected with {}, the number of connections is {}", memberId, sseEmitterMap.size());
+        sseEmitterMap.put(email, sseEmitter);
+        log.info("connected with {}, the number of connections is {}", email, sseEmitterMap.size());
     }
 
-    public void remove(Long memberId) {
-        sseEmitterMap.remove(memberId);
-        log.info("disconnected with {}, the number of connections is {}", memberId, sseEmitterMap.size());
+    public void remove(String email) {
+        sseEmitterMap.remove(email);
+        log.info("disconnected with {}, the number of connections is {}", email, sseEmitterMap.size());
     }
 
-    public void send(Long memberId, String eventName, Object eventData) {
-        SseEmitter sseEmitter = sseEmitterMap.get(memberId);
+    public void send(String email, String eventName, Object eventData) {
+        SseEmitter sseEmitter = sseEmitterMap.get(email);
         try {
             sseEmitter.send(
                     event()
@@ -38,17 +38,17 @@ public void send(Long memberId, String eventName, Object eventData) {
                             .data(eventData)
             );
         } catch (IOException | IllegalStateException e) {
-            remove(memberId);
+            remove(email);
         }
     }
 
     public void sendToAll(String eventName, Object eventData) {
         SseEventBuilder sseEventBuilder = event().name(eventName).data(eventData);
-        sseEmitterMap.forEach((memberId, sseEmitter) -> {
+        sseEmitterMap.forEach((email, sseEmitter) -> {
             try {
                 sseEmitter.send(sseEventBuilder);
             } catch (IOException | IllegalStateException e) {
-                remove(memberId);
+                remove(email);
             }
         });
     }
diff --git a/src/main/java/com/api/trip/domain/notification/controller/NotificationController.java b/src/main/java/com/api/trip/domain/notification/controller/NotificationController.java
index afc631a..75b151c 100644
--- a/src/main/java/com/api/trip/domain/notification/controller/NotificationController.java
+++ b/src/main/java/com/api/trip/domain/notification/controller/NotificationController.java
@@ -1,9 +1,6 @@
 package com.api.trip.domain.notification.controller;
 
-import com.api.trip.common.exception.CustomException;
-import com.api.trip.common.exception.ErrorCode;
 import com.api.trip.common.sse.emitter.SseEmitterMap;
-import com.api.trip.domain.member.repository.MemberRepository;
 import com.api.trip.domain.notification.controller.dto.DeleteNotificationRequest;
 import com.api.trip.domain.notification.controller.dto.GetMyNotificationsResponse;
 import com.api.trip.domain.notification.controller.dto.ReadNotificationRequest;
@@ -22,20 +19,15 @@
 @RequiredArgsConstructor
 public class NotificationController {
 
-    private final MemberRepository memberRepository;
     private final NotificationService notificationService;
     private final SseEmitterMap sseEmitterMap;
 
     @GetMapping(value = "/connect", produces = MediaType.TEXT_EVENT_STREAM_VALUE)
     public ResponseEntity<SseEmitter> connect() {
         String email = SecurityContextHolder.getContext().getAuthentication().getName();
-        Long memberId = memberRepository.findByEmail(email)
-                .orElseThrow(() -> new CustomException(ErrorCode.UNAUTHORIZED))
-                .getId();
-
         SseEmitter sseEmitter = new SseEmitter(3600000L);
-        sseEmitterMap.put(memberId, sseEmitter);
-        sseEmitterMap.send(memberId, "connect", LocalDateTime.now());
+        sseEmitterMap.put(email, sseEmitter);
+        sseEmitterMap.send(email, "connect", LocalDateTime.now());
         return ResponseEntity.ok(sseEmitter);
     }
 
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
index 085b034..5ada501 100644
--- a/src/main/resources/application.yml
+++ b/src/main/resources/application.yml
@@ -1,9 +1,6 @@
 spring:
   profiles:
     active: dev
-  datasource:
-    hikari:
-      maximum-pool-size: 4
   h2:
     console:
       enabled: true