diff --git a/.github/workflows/cd.yml b/.github/workflows/cd.yml
index f5cc1b90..b4c4e5e1 100644
--- a/.github/workflows/cd.yml
+++ b/.github/workflows/cd.yml
@@ -1,4 +1,4 @@
-name: Continuous Deployment
+name: Backend Continuous Deployment
 
 on:
   push:
@@ -9,27 +9,25 @@ jobs:
     runs-on: ubuntu-24.04
 
     steps:
-      # 1. Compare branch 코드 내려 받기
-      - name: Checkout PR
+      # 1. 브랜치 checkout
+      - name: Checkout code
         uses: actions/checkout@v3
-        with:
-          ref: ${{ github.event.pull_request.head.ref }}
 
-      # 2. 자바 환경 설정
+      # 2. JDK 설정
       - name: Set up JDK 17
         uses: actions/setup-java@v3
         with:
-          java-version: '17'
-          distribution: 'temurin'
+          java-version: "17"
+          distribution: "temurin"
 
-        # 3. Docker 이미지 build 및 push
+      # 3. Docker 이미지 build 및 push
       - name: docker build and push
         run: |
           docker login -u ${{ secrets.DOCKER_USERNAME }} -p ${{ secrets.DOCKER_PASSWORD }}
           docker build -t ${{ secrets.DOCKER_USERNAME }}/gotcha:latest .
           docker push ${{ secrets.DOCKER_USERNAME }}/gotcha:latest
 
-      # 4. ec2 pull
+      # 4. backend 서비스 재시작
       - name: Deploy to server
         uses: appleboy/ssh-action@master
         with:
@@ -39,9 +37,17 @@ jobs:
           key: ${{ secrets.SERVER_KEY }}
           script: |
             docker login -u ${{ secrets.DOCKER_USERNAME }} -p ${{ secrets.DOCKER_PASSWORD }}
-            docker system prune -a -f
-            docker-compose down
-            docker rmi ${{ secrets.DOCKER_USERNAME }}/gotcha:latest
+
+            echo "==== BACKEND 컨테이너 중지 ===="
+            docker-compose stop app || true
+
+            echo "==== 오래된 BACKEND 이미지 삭제 ===="
+            docker rmi ${{ secrets.DOCKER_USERNAME }}/gotcha:latest || true
+
+            echo "==== 최신 BACKEND 이미지 pull ===="
             docker pull ${{ secrets.DOCKER_USERNAME }}/gotcha:latest
-            docker-compose up -d
 
+            echo "==== BACKEND만 재시작 ===="
+            docker-compose up -d app
+
+            echo "==== 백엔드 배포 완료! ===="
diff --git a/gotcha-common/src/main/java/gotcha_common/util/CookieUtil.java b/gotcha-common/src/main/java/gotcha_common/util/CookieUtil.java
index 5b130b38..be5d569c 100644
--- a/gotcha-common/src/main/java/gotcha_common/util/CookieUtil.java
+++ b/gotcha-common/src/main/java/gotcha_common/util/CookieUtil.java
@@ -20,7 +20,7 @@ public ResponseCookie createCookie(String key, String value, boolean autoSignIn)
                 .path("/")
                 .httpOnly(true)
                 .secure(secure)
-                .sameSite(secure ? "None" : "Lax");
+                .sameSite(secure ? "Strict" : "Lax");
 
         if(autoSignIn)
             cookie.maxAge(COOKIE_REFRESH_EXPIRATION);
@@ -35,7 +35,7 @@ public void deleteCookie(String cookieName, HttpServletResponse response) {
                 .httpOnly(true)
                 .maxAge(0)
                 .secure(secure)
-                .sameSite(secure ? "None" : "Lax")
+                .sameSite(secure ? "Strict" : "Lax")
                 .build();
 
         response.addHeader("Set-Cookie", cookie.toString());