diff --git a/core/migrations/0002_auto_20160705_2303.py b/core/migrations/0002_auto_20160705_2303.py
new file mode 100644
index 00000000..fc207d40
--- /dev/null
+++ b/core/migrations/0002_auto_20160705_2303.py
@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='user',
+            name='date_of_birth',
+            field=models.DateField(verbose_name='date of birth', blank=True),
+        ),
+    ]
diff --git a/core/migrations/0003_auto_20160705_2304.py b/core/migrations/0003_auto_20160705_2304.py
new file mode 100644
index 00000000..607b57df
--- /dev/null
+++ b/core/migrations/0003_auto_20160705_2304.py
@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0002_auto_20160705_2303'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='user',
+            name='date_of_birth',
+            field=models.DateField(null=True, blank=True, verbose_name='date of birth'),
+        ),
+    ]
diff --git a/core/models.py b/core/models.py
index eb4b4b66..839ce9b0 100644
--- a/core/models.py
+++ b/core/models.py
@@ -75,7 +75,7 @@ class User(AbstractBaseUser, PermissionsMixin):
     first_name = models.CharField(_('first name'), max_length=30)
     last_name = models.CharField(_('last name'), max_length=30)
     email = models.EmailField(_('email address'), unique=True)
-    date_of_birth = models.DateField(_('date of birth'))
+    date_of_birth = models.DateField(_('date of birth'), blank=True, null=True)
     nick_name = models.CharField(max_length=30, blank=True)
     is_staff = models.BooleanField(
         _('staff status'),
@@ -99,7 +99,7 @@ class User(AbstractBaseUser, PermissionsMixin):
     objects = UserManager()
 
     USERNAME_FIELD = 'username'
-    REQUIRED_FIELDS = ['email', 'date_of_birth']
+    # REQUIRED_FIELDS = ['email']
 
     class Meta:
         verbose_name = _('user')