diff --git a/oidc_provider/models.py b/oidc_provider/models.py
index f545ac6..d741ce2 100644
--- a/oidc_provider/models.py
+++ b/oidc_provider/models.py
@@ -86,28 +86,26 @@ class Token(models.Model):
 class UserInfo(models.Model):
 
     user = models.OneToOneField(User, primary_key=True)
-
-    given_name = models.CharField(max_length=255, default='')
-    family_name = models.CharField(max_length=255, default='')
-    middle_name = models.CharField(max_length=255, default='')
-    nickname = models.CharField(max_length=255, default='')
-    preferred_username = models.CharField(max_length=255, default='')
-    profile = models.URLField(default='')
-    picture = models.URLField(default='')
-    website = models.URLField(default='')
-    email_verified = models.BooleanField(default=False)
-    gender = models.CharField(max_length=100, default='')
-    birthdate = models.DateField(null=True)
-    zoneinfo = models.CharField(max_length=100, default='')
-    locale = models.CharField(max_length=100, default='')
-    phone_number = models.CharField(max_length=255, default='')
-    phone_number_verified = models.BooleanField(default=False)
-    address_formatted = models.CharField(max_length=255, default='')
-    address_street_address = models.CharField(max_length=255, default='')
-    address_locality = models.CharField(max_length=255, default='')
-    address_region = models.CharField(max_length=255, default='')
-    address_postal_code = models.CharField(max_length=255, default='')
-    address_country = models.CharField(max_length=255, default='')
+    given_name = models.CharField(max_length=255, blank=True, null=True)
+    family_name = models.CharField(max_length=255, blank=True, null=True)
+    middle_name = models.CharField(max_length=255, blank=True, null=True)
+    nickname = models.CharField(max_length=255, blank=True, null=True)
+    preferred_username = models.CharField(max_length=255, blank=True, null=True)
+    profile = models.URLField(default='', null=True, blank=True)
+    picture = models.URLField(default='', null=True, blank=True)
+    website = models.URLField(default='', null=True, blank=True)
+    email_verified = models.NullBooleanField(default=False)
+    locale = models.CharField(max_length=100, blank=True, null=True)
+    phone_number = models.CharField(max_length=255, blank=True, null=True)
+    phone_number_verified = models.NullBooleanField(default=False)
+    address_formatted = models.CharField(max_length=255, blank=True, null=True)
+    address_street_address = models.CharField(max_length=255, blank=True,
+                                              null=True)
+    address_locality = models.CharField(max_length=255, blank=True, null=True)
+    address_region = models.CharField(max_length=255, blank=True, null=True)
+    address_postal_code = models.CharField(max_length=255, blank=True,
+                                           null=True)
+    address_country = models.CharField(max_length=255, blank=True, null=True)
     updated_at = models.DateTimeField(auto_now=True, null=True)
 
     @property