diff --git a/categories/migrations/0003_auto_20200306_1050.py b/categories/migrations/0003_auto_20200306_1050.py
new file mode 100644
index 0000000..c725321
--- /dev/null
+++ b/categories/migrations/0003_auto_20200306_1050.py
@@ -0,0 +1,35 @@
+# Generated by Django 3.0.4 on 2020-03-06 10:50
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('contenttypes', '0002_remove_content_type_name'),
+        ('categories', '0002_auto_20170217_1111'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='category',
+            name='level',
+            field=models.PositiveIntegerField(editable=False),
+        ),
+        migrations.AlterField(
+            model_name='category',
+            name='lft',
+            field=models.PositiveIntegerField(editable=False),
+        ),
+        migrations.AlterField(
+            model_name='category',
+            name='rght',
+            field=models.PositiveIntegerField(editable=False),
+        ),
+        migrations.AlterField(
+            model_name='categoryrelation',
+            name='content_type',
+            field=models.ForeignKey(limit_choices_to=models.Q(models.Q(('app_label', 'simpletext'), ('model', 'simpletext')), models.Q(('app_label', 'flatpages'), ('model', 'flatpage')), _connector='OR'), on_delete=django.db.models.deletion.CASCADE, to='contenttypes.ContentType', verbose_name='content type'),
+        ),
+    ]
diff --git a/example/simpletext/migrations/0003_auto_20200306_0928.py b/example/simpletext/migrations/0003_auto_20200306_0928.py
new file mode 100644
index 0000000..0d786bc
--- /dev/null
+++ b/example/simpletext/migrations/0003_auto_20200306_0928.py
@@ -0,0 +1,28 @@
+# Generated by Django 3.0.4 on 2020-03-06 09:28
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('simpletext', '0002_auto_20171204_0721'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='simplecategory',
+            name='level',
+            field=models.PositiveIntegerField(editable=False),
+        ),
+        migrations.AlterField(
+            model_name='simplecategory',
+            name='lft',
+            field=models.PositiveIntegerField(editable=False),
+        ),
+        migrations.AlterField(
+            model_name='simplecategory',
+            name='rght',
+            field=models.PositiveIntegerField(editable=False),
+        ),
+    ]