diff --git a/.idea/misc.xml b/.idea/misc.xml
index 9f71c83d..773fe0fb 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,4 +1,3 @@
-<?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ExternalStorageConfigurationManager" enabled="true" />
   <component name="ProjectRootManager" version="2" languageLevel="JDK_17" project-jdk-name="jbr-17" project-jdk-type="JavaSDK">
diff --git a/feature/library/src/main/java/one/nem/lacerta/feature/library/LibraryTopFragment.java b/feature/library/src/main/java/one/nem/lacerta/feature/library/LibraryTopFragment.java
index 7ca13af5..ada38c82 100644
--- a/feature/library/src/main/java/one/nem/lacerta/feature/library/LibraryTopFragment.java
+++ b/feature/library/src/main/java/one/nem/lacerta/feature/library/LibraryTopFragment.java
@@ -1,6 +1,5 @@
 package one.nem.lacerta.feature.library;
 
-import static one.nem.lacerta.feature.library.LibraryUtils.convertToLibraryItems;
 
 import android.os.Bundle;
 
diff --git a/feature/library/src/main/java/one/nem/lacerta/feature/library/LibraryUtils.java b/feature/library/src/main/java/one/nem/lacerta/feature/library/LibraryUtils.java
deleted file mode 100644
index f18eb122..00000000
--- a/feature/library/src/main/java/one/nem/lacerta/feature/library/LibraryUtils.java
+++ /dev/null
@@ -1,24 +0,0 @@
-package one.nem.lacerta.feature.library;
-
-import java.util.ArrayList;
-import java.util.List;
-
-import one.nem.lacerta.model.ListItem;
-import one.nem.lacerta.model.document.DocumentMeta;
-
-// DocumentMeta クラスのリストを ListItem クラスのリストに変換するためのユーティリティクラスの一部
-public class LibraryUtils {
-
-    public static ArrayList<ListItem> convertToLibraryItems(List<DocumentMeta> metas) {
-        ArrayList<ListItem> libraryItems = new ArrayList<>();
-        for (DocumentMeta meta : metas) {
-            ListItem listItem = new ListItem();
-            listItem.setTitle(meta.getTitle());
-
-            listItem.setDescription(meta.getId());
-
-            libraryItems.add(listItem);
-        }
-        return libraryItems;
-    }
-}