diff --git a/app/src/main/java/com/example/oplogy/AppDatabase.java b/app/src/main/java/com/example/oplogy/AppDatabase.java
index c52259d..091f71e 100644
--- a/app/src/main/java/com/example/oplogy/AppDatabase.java
+++ b/app/src/main/java/com/example/oplogy/AppDatabase.java
@@ -3,7 +3,7 @@ package com.example.oplogy;
 import androidx.room.Database;
 import androidx.room.RoomDatabase;
 
-@Database(entities = {SetUpTable.class}, version = 2, exportSchema = false)
+@Database(entities = {SetUpTable.class}, version = 3, exportSchema = false)
 public abstract class AppDatabase extends RoomDatabase {
     // データベースにアクセスするためのメソッドを提供する
     public abstract SetUpTableDao setUpTableDao();
diff --git a/app/src/main/java/com/example/oplogy/MainActivity.java b/app/src/main/java/com/example/oplogy/MainActivity.java
index e759dc1..6f1aac7 100644
--- a/app/src/main/java/com/example/oplogy/MainActivity.java
+++ b/app/src/main/java/com/example/oplogy/MainActivity.java
@@ -176,7 +176,9 @@ public class MainActivity extends AppCompatActivity implements View.OnClickListe
 
         // タスク1: ローカルDBから生徒数を取得してtotalStudentと比較
         executor.execute(() -> {
-            AppDatabase db = Room.databaseBuilder(getApplicationContext(), AppDatabase.class, "SetUpTable").build();
+            AppDatabase db = Room.databaseBuilder(getApplicationContext(), AppDatabase.class, "SetUpTable")
+                    .fallbackToDestructiveMigration()
+                    .build();
             SetUpTableDao setUpTableDao = db.setUpTableDao();
 
             Log.d("MainActivity", "db" + setUpTableDao.getAll());
@@ -341,7 +343,9 @@ public class MainActivity extends AppCompatActivity implements View.OnClickListe
         //roomからclassIdを取得
         ExecutorService executor = Executors.newSingleThreadExecutor();
         executor.execute(() -> {
-            AppDatabase db = Room.databaseBuilder(getApplicationContext(), AppDatabase.class, "SetUpTable").build();
+            AppDatabase db = Room.databaseBuilder(getApplicationContext(), AppDatabase.class, "SetUpTable")
+                    .fallbackToDestructiveMigration()
+                    .build();
             SetUpTableDao setUpTableDao = db.setUpTableDao();
             classId = setUpTableDao.getClassId();
         });
diff --git a/app/src/main/java/com/example/oplogy/SetUpActivity.java b/app/src/main/java/com/example/oplogy/SetUpActivity.java
index 851d0f1..1f769c6 100644
--- a/app/src/main/java/com/example/oplogy/SetUpActivity.java
+++ b/app/src/main/java/com/example/oplogy/SetUpActivity.java
@@ -127,11 +127,8 @@ public class SetUpActivity extends FragmentActivity
 
             executor.execute(() -> {
                 //roomのインスタンスを作成
-                AppDatabase db = Room.databaseBuilder(
-                        getApplicationContext(),
-                        AppDatabase.class,
-                        "SetUpTable"
-                )
+                AppDatabase db = Room.databaseBuilder(getApplicationContext(), AppDatabase.class, "SetUpTable")
+                        .fallbackToDestructiveMigration()
                         .build();
                 SetUpTableDao setUpTableDao = db.setUpTableDao();
                 // Roomの操作を行う