diff --git a/debian/control b/debian/control
index 218de93..81762a9 100644
--- a/debian/control
+++ b/debian/control
@@ -11,6 +11,5 @@ Package: python-authentic2-auth-fedict
 Architecture: all
 Depends: ${misc:Depends},
     python-authentic2 (>= 2.1.20.1054)
-Conflicts: python-authentic2 (> 2.1.20.1137)
 Description: Fedict authentication frontend for Authentic2
 
diff --git a/src/authentic2_auth_fedict/__init__.py b/src/authentic2_auth_fedict/__init__.py
index 216f6e9..edfdbe4 100644
--- a/src/authentic2_auth_fedict/__init__.py
+++ b/src/authentic2_auth_fedict/__init__.py
@@ -14,6 +14,8 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+import json
+
 import django.apps
 from django.utils.translation import ugettext_lazy as _
 from django.contrib.auth.signals import user_logged_in
@@ -63,20 +65,32 @@ class Plugin(object):
         return [
             {'label': _('National Register Number'),
              'name': 'nrn',
+             'serialize': json.dumps,
+             'deserialize': json.loads,
              'field_class': fields.NrnField, },
             {'label': _('Date'),
+             'serialize': json.dumps,
+             'deserialize': json.loads,
              'name': 'date',
              'field_class': fields.DateField, },
             {'label': _('Street'),
+             'serialize': json.dumps,
+             'deserialize': json.loads,
              'name': 'street',
              'field_class': fields.StreetField, },
             {'label': _('House number'),
+             'serialize': json.dumps,
+             'deserialize': json.loads,
              'name': 'num_house',
              'field_class': fields.NumHouseField, },
             {'label': _('Phone number'),
+             'serialize': json.dumps,
+             'deserialize': json.loads,
              'name': 'phone',
              'field_class': fields.NumPhoneField, },
             {'label': _('Country'),
+             'serialize': json.dumps,
+             'deserialize': json.loads,
              'name': 'country',
              'field_class': fields.CountryField, },
         ]