diff --git a/membership/migrations/0011_customuser_username.py b/membership/migrations/0011_customuser_username.py
deleted file mode 100644
index 21a9cc14..00000000
--- a/membership/migrations/0011_customuser_username.py
+++ /dev/null
@@ -1,20 +0,0 @@
-# -*- coding: utf-8 -*-
-# Generated by Django 1.9.4 on 2019-12-10 10:52
-from __future__ import unicode_literals
-
-from django.db import migrations, models
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('membership', '0010_customuser_import_stripe_bill_remark'),
-    ]
-
-    operations = [
-        migrations.AddField(
-            model_name='customuser',
-            name='username',
-            field=models.CharField(max_length=50, null=True),
-        ),
-    ]
diff --git a/membership/migrations/0012_auto_20191210_1141.py b/membership/migrations/0012_auto_20191210_1141.py
deleted file mode 100644
index 7a64373a..00000000
--- a/membership/migrations/0012_auto_20191210_1141.py
+++ /dev/null
@@ -1,20 +0,0 @@
-# -*- coding: utf-8 -*-
-# Generated by Django 1.9.4 on 2019-12-10 11:41
-from __future__ import unicode_literals
-
-from django.db import migrations, models
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('membership', '0011_customuser_username'),
-    ]
-
-    operations = [
-        migrations.AlterField(
-            model_name='customuser',
-            name='username',
-            field=models.CharField(max_length=50, null=True, unique=True),
-        ),
-    ]
diff --git a/membership/migrations/0013_customuser_in_ldap.py b/membership/migrations/0013_customuser_in_ldap.py
deleted file mode 100644
index 81cd2fd7..00000000
--- a/membership/migrations/0013_customuser_in_ldap.py
+++ /dev/null
@@ -1,20 +0,0 @@
-# -*- coding: utf-8 -*-
-# Generated by Django 1.9.4 on 2019-12-10 15:30
-from __future__ import unicode_literals
-
-from django.db import migrations, models
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('membership', '0012_auto_20191210_1141'),
-    ]
-
-    operations = [
-        migrations.AddField(
-            model_name='customuser',
-            name='in_ldap',
-            field=models.BooleanField(default=False),
-        ),
-    ]
diff --git a/membership/migrations/0014_remove_customuser_in_ldap.py b/membership/migrations/0014_remove_customuser_in_ldap.py
deleted file mode 100644
index af594e1f..00000000
--- a/membership/migrations/0014_remove_customuser_in_ldap.py
+++ /dev/null
@@ -1,19 +0,0 @@
-# -*- coding: utf-8 -*-
-# Generated by Django 1.9.4 on 2019-12-10 15:36
-from __future__ import unicode_literals
-
-from django.db import migrations
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('membership', '0013_customuser_in_ldap'),
-    ]
-
-    operations = [
-        migrations.RemoveField(
-            model_name='customuser',
-            name='in_ldap',
-        ),
-    ]
diff --git a/membership/migrations/0015_customuser_in_ldap.py b/membership/migrations/0015_customuser_in_ldap.py
deleted file mode 100644
index 39c3384b..00000000
--- a/membership/migrations/0015_customuser_in_ldap.py
+++ /dev/null
@@ -1,20 +0,0 @@
-# -*- coding: utf-8 -*-
-# Generated by Django 1.9.4 on 2019-12-10 17:05
-from __future__ import unicode_literals
-
-from django.db import migrations, models
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('membership', '0014_remove_customuser_in_ldap'),
-    ]
-
-    operations = [
-        migrations.AddField(
-            model_name='customuser',
-            name='in_ldap',
-            field=models.BooleanField(default=False),
-        ),
-    ]
diff --git a/membership/migrations/0016_auto_20191213_1309.py b/membership/migrations/0016_auto_20191213_1309.py
deleted file mode 100644
index fe888c03..00000000
--- a/membership/migrations/0016_auto_20191213_1309.py
+++ /dev/null
@@ -1,20 +0,0 @@
-# -*- coding: utf-8 -*-
-# Generated by Django 1.9.4 on 2019-12-13 13:09
-from __future__ import unicode_literals
-
-from django.db import migrations, models
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('membership', '0015_customuser_in_ldap'),
-    ]
-
-    operations = [
-        migrations.AlterField(
-            model_name='customuser',
-            name='username',
-            field=models.CharField(max_length=60, null=True, unique=True),
-        ),
-    ]