diff --git a/.idea/compiler.xml b/.idea/compiler.xml
index b589d56..b86273d 100644
--- a/.idea/compiler.xml
+++ b/.idea/compiler.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="CompilerConfiguration">
-    <bytecodeTargetLevel target="17" />
+    <bytecodeTargetLevel target="21" />
   </component>
 </project>
\ No newline at end of file
diff --git a/.idea/deploymentTargetSelector.xml b/.idea/deploymentTargetSelector.xml
index b268ef3..a207691 100644
--- a/.idea/deploymentTargetSelector.xml
+++ b/.idea/deploymentTargetSelector.xml
@@ -4,6 +4,14 @@
     <selectionStates>
       <SelectionState runConfigName="app">
         <option name="selectionMode" value="DROPDOWN" />
+        <DropdownSelection timestamp="2025-12-18T10:01:01.554873400Z">
+          <Target type="DEFAULT_BOOT">
+            <handle>
+              <DeviceId pluginId="LocalEmulator" identifier="path=C:\Users\natsu\.android\avd\Pixel_8.avd" />
+            </handle>
+          </Target>
+        </DropdownSelection>
+        <DialogSelection />
       </SelectionState>
     </selectionStates>
   </component>
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 8978d23..74dd639 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,6 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ExternalStorageConfigurationManager" enabled="true" />
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="jbr-17" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="jbr-21" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">
diff --git a/app/src/main/java/com/example/tampopo_client/views/FriendReceivedFragment.java b/app/src/main/java/com/example/tampopo_client/views/FriendReceivedFragment.java
index b5a8976..cb52bac 100644
--- a/app/src/main/java/com/example/tampopo_client/views/FriendReceivedFragment.java
+++ b/app/src/main/java/com/example/tampopo_client/views/FriendReceivedFragment.java
@@ -36,6 +36,10 @@
 
     private Tampopo tampopo;
 
+    // RecyclerView とそのアダプターをフィールドとして保持しておく
+    private RecyclerView recyclerView;
+    private MyFriendRequestRecyclerViewAdapter adapter;
+
     /**
      * Mandatory empty constructor for the fragment manager to instantiate the
      * fragment (e.g. upon screen orientation changes).
@@ -81,13 +85,20 @@
         // Set the adapter
         if (view instanceof RecyclerView) {
             Context context = view.getContext();
-            RecyclerView recyclerView = (RecyclerView) view;
+            recyclerView = (RecyclerView) view;
+
             if (mColumnCount <= 1) {
                 recyclerView.setLayoutManager(new LinearLayoutManager(context));
             } else {
                 recyclerView.setLayoutManager(new GridLayoutManager(context, mColumnCount));
             }
-            recyclerView.setAdapter(new MyFriendRequestRecyclerViewAdapter(FriendRequestContent.ITEMS, friendViewModel, receiverId, token));
+
+            // 画面を開くたびに、いったんリストを空にしてから最新データを入れるようにする
+            FriendRequestContent.ITEMS.clear();
+            FriendRequestContent.ITEM_MAP.clear();
+
+            adapter = new MyFriendRequestRecyclerViewAdapter(FriendRequestContent.ITEMS, friendViewModel, receiverId, token);
+            recyclerView.setAdapter(adapter);
         }
         return view;
     }
@@ -102,9 +113,17 @@
             // LiveData に変更があったとき（新しい友達リクエストのリストが届いたとき）に呼ばれるメソッド
             @Override
             public void onChanged(List<FriendRequest> friendRequests) {
+                // LiveData に新しいリストが来たら、表示用リストを作り直してアダプターに更新を通知
+                FriendRequestContent.ITEMS.clear();
+                FriendRequestContent.ITEM_MAP.clear();
+
                 for (FriendRequest f: friendRequests) {
                     FriendRequestContent.addItem(new FriendRequestContent.FriendRequestItem(f.getSenderId(), "ユーザー名"));
                 }
+
+                if (adapter != null) {
+                    adapter.notifyDataSetChanged();
+                }
             }
         });
     }