diff --git a/src/main/java/com/app/bookstore/service/shopping/cart/ShoppingCartService.java b/src/main/java/com/app/bookstore/service/shopping/cart/ShoppingCartService.java
index 5cdc6b5..82199a4 100644
--- a/src/main/java/com/app/bookstore/service/shopping/cart/ShoppingCartService.java
+++ b/src/main/java/com/app/bookstore/service/shopping/cart/ShoppingCartService.java
@@ -7,7 +7,7 @@
 import org.springframework.security.core.Authentication;
 
 public interface ShoppingCartService {
-    ShoppingCartResponseDto findByUserId(Long userId);
+    ShoppingCartResponseDto findByUserId(Long id);
 
     void createShoppingCart(User user);
 
@@ -16,7 +16,7 @@ ShoppingCartResponseDto addToShoppingCart(Authentication authentication,
 
     ShoppingCartResponseDto updateByCartId(
             Authentication authentication,
-            Long cartItemId,
+            Long id,
             PutCartItemRequestDto requestDto
     );
 }
diff --git a/src/main/java/com/app/bookstore/service/shopping/cart/ShoppingCartServiceImpl.java b/src/main/java/com/app/bookstore/service/shopping/cart/ShoppingCartServiceImpl.java
index b2a59eb..65e3924 100644
--- a/src/main/java/com/app/bookstore/service/shopping/cart/ShoppingCartServiceImpl.java
+++ b/src/main/java/com/app/bookstore/service/shopping/cart/ShoppingCartServiceImpl.java
@@ -21,8 +21,8 @@ public class ShoppingCartServiceImpl implements ShoppingCartService {
     private final ShoppingCartMapper shoppingCartMapper;
 
     @Override
-    public ShoppingCartResponseDto findByUserId(Long userId) {
-        return shoppingCartMapper.toDto(shoppingCartRepository.findShoppingCartByUserId(userId));
+    public ShoppingCartResponseDto findByUserId(Long id) {
+        return shoppingCartMapper.toDto(shoppingCartRepository.findShoppingCartByUserId(id));
     }
 
     @Override