diff --git a/src/main/java/com/devcard/devcard/chat/service/ChatService.java b/src/main/java/com/devcard/devcard/chat/service/ChatService.java
index 1f012fe..6f2c58b 100644
--- a/src/main/java/com/devcard/devcard/chat/service/ChatService.java
+++ b/src/main/java/com/devcard/devcard/chat/service/ChatService.java
@@ -212,7 +212,7 @@ public Long extractUserIdFromSession(WebSocketSession session) {
      * @return 해당 파라미터 값 (존재하지 않으면 null 반환)
      */
     private Long extractParamFromUri(String uri, String paramName) {
-        // e.g. `ws://localhost:8080/ws?chatId=1&userId=1` 입력의 경우,
+        // e.g. `ws://3.34.144.148:8080/ws?chatId=1&userId=1` 입력의 경우,
         try {
             // "?"로 나누어 쿼리 파라미터 부분만 가져옴 (e.g. `chatId=1&userId=1`)
             String[] parts = uri.split("\\?");
diff --git a/src/main/resources/application.properties b/src/main/resources/application.properties
index 1968c83..7b1d23d 100644
--- a/src/main/resources/application.properties
+++ b/src/main/resources/application.properties
@@ -18,7 +18,7 @@ spring.jpa.show-sql=true
 #spring.datasource.url=jdbc:h2:mem:test;MODE=MYSQL;DB_CLOSE_DELAY=-1
 #spring.datasource.username=sa
 #spring.datasource.password=
-spring.datasource.url=jdbc:mysql://localhost:3306/devcard_db?useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=UTC&characterEncoding=UTF-8
+spring.datasource.url=jdbc:mysql://3.34.144.148:3306/devcard_db?useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=UTC&characterEncoding=UTF-8
 spring.datasource.username=${DB_USERNAME}
 spring.datasource.password=${DB_PASSWORD}
 spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
@@ -37,7 +37,7 @@ logging.level.org.springframework.security=DEBUG
 
 
 # QR Code Service
-qr.domain.uri=http://localhost:8080/
+qr.domain.uri=http://3.34.144.148:8080/
 qr.code.directory=src/main/resources/static/qrcodes/
 
 # Kakao Service
diff --git a/src/main/resources/static/js/card/card-share.js b/src/main/resources/static/js/card/card-share.js
index e5ac237..6f0758c 100644
--- a/src/main/resources/static/js/card/card-share.js
+++ b/src/main/resources/static/js/card/card-share.js
@@ -8,16 +8,16 @@ document.getElementById('kakao-share-btn').addEventListener('click', function ()
             description: '회사: [[${card.company}]], 직책: [[${card.position}]]',
             imageUrl: 'https://developers.kakao.com/assets/img/about/logos/kakaolink/kakaolink_btn_medium.png',
             link: {
-                mobileWebUrl: 'http://localhost:8080/cards/' + cardId + '/view',
-                webUrl: 'http://localhost:8080/cards/' + cardId + '/view'
+                mobileWebUrl: 'http://3.34.144.148:8080/cards/' + cardId + '/view',
+                webUrl: 'http://3.34.144.148:8080/cards/' + cardId + '/view'
             }
         },
         buttons: [
             {
                 title: '명함 보기',
                 link: {
-                    mobileWebUrl: 'http://localhost:8080/cards/' + cardId + '/view',
-                    webUrl: 'http://localhost:8080/cards/' + cardId + '/view'
+                    mobileWebUrl: 'http://3.34.144.148:8080/cards/' + cardId + '/view',
+                    webUrl: 'http://3.34.144.148:8080/cards/' + cardId + '/view'
                 }
             }
         ],
diff --git a/src/main/resources/static/js/chat.js b/src/main/resources/static/js/chat.js
index 697f1ce..ccaa441 100644
--- a/src/main/resources/static/js/chat.js
+++ b/src/main/resources/static/js/chat.js
@@ -148,7 +148,7 @@ $(document).ready(function () {
         fetchChatRoom(chatId);
 
         // 임시로 로컬 서버 설정
-        const socket = new WebSocket(`ws://localhost:8080/ws?chatId=${chatId}&userId=${memberId}`);
+        const socket = new WebSocket(`ws://3.34.144.148:8080/ws?chatId=${chatId}&userId=${memberId}`);
 
         // 웹소켓 연결
         socket.addEventListener("open", () => {
diff --git a/src/test/java/com/devcard/devcard/chat/service/ChatServiceTest.java b/src/test/java/com/devcard/devcard/chat/service/ChatServiceTest.java
index b23d1c5..489a95d 100644
--- a/src/test/java/com/devcard/devcard/chat/service/ChatServiceTest.java
+++ b/src/test/java/com/devcard/devcard/chat/service/ChatServiceTest.java
@@ -370,7 +370,7 @@ void testExtractMessage_EmptyJsonObject() {
     @DisplayName("유효한 chatId 추출 성공")
     void testExtractChatIdFromSession_ValidChatId() {
         // 유효한 URI 설정
-        when(session.getUri()).thenReturn(URI.create("ws://localhost:8080/ws?chatId=1&userId=1"));
+        when(session.getUri()).thenReturn(URI.create("ws://3.34.144.148:8080/ws?chatId=1&userId=1"));
 
         // chatId가 1로 반환되는지 확인
         Long chatId = chatService.extractChatIdFromSession(session);
@@ -381,7 +381,7 @@ void testExtractChatIdFromSession_ValidChatId() {
     @DisplayName("쿼리 파라미터 없음 - chatId")
     void testExtractChatIdFromSession_NoChatId() {
         // chatId가 없는 URI 설정
-        when(session.getUri()).thenReturn(URI.create("ws://localhost:8080/ws"));
+        when(session.getUri()).thenReturn(URI.create("ws://3.34.144.148:8080/ws"));
 
         // chatId가 없으므로 IllegalArgumentException 발생
         Exception exception = assertThrows(
@@ -395,7 +395,7 @@ void testExtractChatIdFromSession_NoChatId() {
     @DisplayName("chatId 숫자 형식 오류")
     void testExtractChatIdFromSession_InvalidChatIdFormat() {
         // chatId가 잘못된 형식인 URI 설정
-        when(session.getUri()).thenReturn(URI.create("ws://localhost:8080/ws?chatId=abc&userId=1"));
+        when(session.getUri()).thenReturn(URI.create("ws://3.34.144.148:8080/ws?chatId=abc&userId=1"));
 
         // chatId가 숫자 형식이 아니므로 IllegalArgumentException 발생
         Exception exception = assertThrows(
@@ -409,7 +409,7 @@ void testExtractChatIdFromSession_InvalidChatIdFormat() {
     @DisplayName("유효한 userId 추출 성공")
     void testExtractUserIdFromSession_ValidUserId() {
         // 유효한 URI 설정
-        when(session.getUri()).thenReturn(URI.create("ws://localhost:8080/ws?chatId=1&userId=1"));
+        when(session.getUri()).thenReturn(URI.create("ws://3.34.144.148:8080/ws?chatId=1&userId=1"));
 
         // userId가 1로 반환되는지 확인
         Long userId = chatService.extractUserIdFromSession(session);
@@ -420,7 +420,7 @@ void testExtractUserIdFromSession_ValidUserId() {
     @DisplayName("쿼리 파라미터 없음 - userId")
     void testExtractUserIdFromSession_NoUserId() {
         // userId가 없는 URI 설정
-        when(session.getUri()).thenReturn(URI.create("ws://localhost:8080/ws"));
+        when(session.getUri()).thenReturn(URI.create("ws://3.34.144.148:8080/ws"));
 
         // userId가 없으므로 IllegalArgumentException 발생
         Exception exception = assertThrows(
@@ -434,7 +434,7 @@ void testExtractUserIdFromSession_NoUserId() {
     @DisplayName("userId 숫자 형식 오류")
     void testExtractUserIdFromSession_InvalidUserIdFormat() {
         // userId가 잘못된 형식인 URI 설정
-        when(session.getUri()).thenReturn(URI.create("ws://localhost:8080/ws?chatId=1&userId=abc"));
+        when(session.getUri()).thenReturn(URI.create("ws://3.34.144.148:8080/ws?chatId=1&userId=abc"));
 
         // userId가 숫자 형식이 아니므로 IllegalArgumentException 발생
         Exception exception = assertThrows(