diff --git a/app/posts/repository.py b/app/posts/repository.py
index f6e5d3c..12668cb 100644
--- a/app/posts/repository.py
+++ b/app/posts/repository.py
@@ -121,29 +121,22 @@ async def save(self, *, post: Post) -> Post:
     async def update_post(
         self,
         *,
-        post_id: int,
+        post: Post,
         title: str,
         description: str,
         category: Category,
         tags: list[str],
-    ) -> Post | None:
-        """기본 필드만 SQL로 업데이트"""
-
-        updated_post = await self.session.scalar(
-            update(Post)
-            .where(Post.id == post_id)
-            .values(
-                title=title,
-                description=description,
-                category=category,
-                tags=tags,
-            )
-            .returning(Post)
-            .options(joinedload(Post.author), joinedload(Post.images))
-        )
+        images: list[PostImage],
+    ) -> Post:
+        """Post 객체를 직접 수정"""
+        post.title = title
+        post.description = description
+        post.category = category
+        post.tags = tags
+        post.images = images
 
         await self.session.flush()
-        return updated_post
+        return post
 
     async def save_post_images(
         self, *, post_images: list[PostImage]
diff --git a/app/posts/service.py b/app/posts/service.py
index 415bb67..ad6e43c 100644
--- a/app/posts/service.py
+++ b/app/posts/service.py
@@ -200,19 +200,15 @@ async def update_post(
                 )
             )
 
-        _ = await self.post_repository.save_post_images(post_images=post_images)
-
         updated_post = await self.post_repository.update_post(
-            post_id=post_id,
+            post=saved_post,
             title=post.title,
             description=post.description,
             category=post.category,
             tags=post.tags,
+            images=post_images,
         )
 
-        if not updated_post:
-            raise HTTPException(status_code=400, detail="게시물 수정 실패")
-
         [like_count, comment_count, is_liked] = await asyncio.gather(
             self.post_like_repository.count_by_id(post_id=post_id),
             self.comment_repository.count_by_post_id(post_id=post_id),