diff --git a/.github/workflows/deploy-server.yml b/.github/workflows/deploy-server.yml
new file mode 100644
index 0000000..26eeead
--- /dev/null
+++ b/.github/workflows/deploy-server.yml
@@ -0,0 +1,28 @@
+name: Deploy to EC2
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Set up SSH key
+        uses: webfactory/ssh-agent@v0.5.4
+        with:
+          ssh-private-key: ${{ secrets.EC2_KEY }}
+
+      - name: Deploy to EC2
+        env:
+          EC2_HOST: ${{ secrets.EC2_HOST }}
+          EC2_USER: ${{ secrets.EC2_USER }}
+        run: |
+          ssh -o StrictHostKeyChecking=no $EC2_USER@$EC2_HOST << 'EOF'
+            cd /home/ubuntu  # 프로젝트 디렉토리로 이동
+            git pull origin master      # 최신 코드 가져오기
+            npm install                 # 의존성 설치
+            pm2 restart all             # PM2로 애플리케이션 재실행
+          EOF
diff --git a/src/index.ts b/src/index.ts
index d67731e..9720475 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -8,12 +8,17 @@ import summarizeRoutes from "./routes/summarizeRoutes";
 dotenv.config();
 
 const app = express();
+
 app.use(bodyParser.json());
 
 app.use("/slack", slackRoutes);
 
 app.use("/api", summarizeRoutes);
 
+app.get("/", (req, res) => {
+  res.send("Hello, World!");
+});
+
 const PORT = process.env.PORT || 3000;
 app.listen(PORT, () => {
   console.log(`서버가 ${PORT}번 포트에서 실행 중입니다.`);
diff --git a/src/routes/slackRoutes.ts b/src/routes/slackRoutes.ts
index 795e251..84a2ca6 100644
--- a/src/routes/slackRoutes.ts
+++ b/src/routes/slackRoutes.ts
@@ -8,22 +8,30 @@ const router = express.Router();
 
 const slackToken = process.env.SLACK_BOT_TOKEN || "";
 
+const processedEvents = new Set(); // 간단한 예로 메모리에 저장
+
 if (!slackToken) {
   console.error("SLACK_BOT_TOKEN 환경 변수가 설정되지 않았습니다.");
-  process.exit(1); // 환경 변수가 설정되지 않았으면 앱을 종료합니다.
 }
 
 const slackClient = new WebClient(slackToken);
 
 router.post("/events", async (req, res) => {
-  const { type, event } = req.body;
+  const { type, event, event_id } = req.body;
 
   if (type === "url_verification") {
     // 슬랙 URL 검증 요청 처리
     return res.json({ challenge: req.body.challenge });
   }
 
+  if (processedEvents.has(event_id)) {
+    // 이미 처리된 이벤트에 대해 200 응답을 보내고 종료
+    return res.status(200).send("Event already processed.");
+  }
+
   if (event && event.type === "app_mention") {
+    processedEvents.add(event_id);
+
     const { text, channel, ts } = event;
     const youtubeUrl = extractYoutubeUrl(text);