diff --git a/hw3/src/model/PhotoAlbumModel.java b/hw3/src/model/PhotoAlbumModel.java
index 78eb527..67c211c 100644
--- a/hw3/src/model/PhotoAlbumModel.java
+++ b/hw3/src/model/PhotoAlbumModel.java
@@ -64,7 +64,7 @@ public class PhotoAlbumModel {
     }
 
     public List<Photo> getPhotos() {
-        return new ArrayList<>(photos);
+        return Collections.unmodifiableList(photos);
     }
 
     public Photo getCurrentPhoto() {