diff --git a/net/settings_common.py b/net/settings_common.py
index b3025b2db..eeba49743 100644
--- a/net/settings_common.py
+++ b/net/settings_common.py
@@ -89,7 +89,7 @@
 VO_LOGFILE = LOG_DIR + 'vo.log'
 
 # http://stackoverflow.com/questions/20301338/django-openid-auth-typeerror-openid-yadis-manager-yadisservicemanager-object-is
-SESSION_SERIALIZER = 'django.contrib.sessions.serializers.PickleSerializer'
+SESSION_SERIALIZER = 'django.contrib.sessions.serializers.JSONSerializer'
 
 # must match fixtures/initial_data.json
 MACHINE_USERNAME = "an-machine"