diff --git a/vote/migrations/005_update_field_type.py b/vote/migrations/005_update_field_type.py
new file mode 100644
index 0000000..6b16d7f
--- /dev/null
+++ b/vote/migrations/005_update_field_type.py
@@ -0,0 +1,23 @@
+# Generated by Django 4.1.7 on 2023-04-02 07:11
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('vote', '0004_auto_20170110_1150'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='vote',
+            name='object_id',
+            field=models.CharField(max_length=50),
+        ),
+        migrations.AlterField(
+            model_name='vote',
+            name='user_id',
+            field=models.CharField(max_length=50),
+        ),
+    ]
diff --git a/vote/models.py b/vote/models.py
index 5c5baa9..ef9720e 100644
--- a/vote/models.py
+++ b/vote/models.py
@@ -27,9 +27,9 @@ class Vote(models.Model):
         DOWN: 'num_vote_down'
     }
 
-    user_id = models.BigIntegerField()
+    user_id = models.CharField(max_length=50)
     content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
-    object_id = models.PositiveIntegerField()
+    object_id = models.CharField(max_length=50)
     content_object = GenericForeignKey()
     action = models.PositiveSmallIntegerField(default=UP)
     create_at = models.DateTimeField(auto_now_add=True)