diff --git a/accounts/utils.py b/accounts/utils.py
index 3657064..8854676 100644
--- a/accounts/utils.py
+++ b/accounts/utils.py
@@ -7,11 +7,11 @@ def generate_user_uid():
 
 
 def is_orga(request, user):
-    return user.is_authenticated() and user.participation_set.get(site=get_current_site(request)).is_orga()
+    return user.is_authenticated and user.participation_set.get(site=get_current_site(request)).is_orga()
 
 
 def is_staff(request, user):
-    return user.is_authenticated() and user.participation_set.get(site=get_current_site(request)).is_staff()
+    return user.is_authenticated and user.participation_set.get(site=get_current_site(request)).is_staff()
 
 
 def can_edit_profile(request, profile):
diff --git a/requirements.txt b/requirements.txt
index 61c905a..df32d05 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-django<1.10
+django<1.11
 django-autoslug
 django-bootstrap3
 django-bower