diff --git a/src/main/java/org/ntlab/citrusserver/repositories/PublicBookManager.java b/src/main/java/org/ntlab/citrusserver/repositories/PublicBookManager.java
index fb9717b..e8a7d17 100644
--- a/src/main/java/org/ntlab/citrusserver/repositories/PublicBookManager.java
+++ b/src/main/java/org/ntlab/citrusserver/repositories/PublicBookManager.java
@@ -111,4 +111,9 @@
             }
         }
     }
+
+    @Override
+    public void bookDeleted(Account account, Book book) {
+
+    }
 }