diff --git a/annuaire/settings.py b/annuaire/settings.py
index 62cbb30..08fcbb1 100644
--- a/annuaire/settings.py
+++ b/annuaire/settings.py
@@ -11,6 +11,7 @@ https://docs.djangoproject.com/en/dev/ref/settings/
 """
 
 import os
+from django.urls import reverse_lazy
 
 # Build paths inside the project like this: os.path.join(BASE_DIR, ...)
 BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
@@ -56,7 +57,7 @@ INSTALLED_APPS = [
     "django.contrib.sessions",
     "django.contrib.messages",
     "django.contrib.staticfiles",
-    "django_cas_ng",
+    "authens",
     "fiches",
 ]
 
@@ -91,7 +92,7 @@ TEMPLATES = [
 
 AUTHENTICATION_BACKENDS = (
     "django.contrib.auth.backends.ModelBackend",
-    "django_cas_ng.backends.CASBackend",
+    "fiches.backends.BackendFiches",
 )
 
 WSGI_APPLICATION = "annuaire.wsgi.application"
@@ -157,8 +158,8 @@ MEDIA_ROOT = os.path.join(BASE_DIR, "media")
 
 MEDIA_URL = "/media/"
 
-CAS_SERVER_URL = "https://cas.eleves.ens.fr/"
-
-CAS_VERSION = "2"
+LOGIN_URL = reverse_lazy("authens:login")
+LOGOUT_REDIRECT_URL = reverse_lazy("home")
+AUTHENS_USE_OLDCAS = False
 
 EMAIL_BACKEND = "django.core.mail.backends.console.EmailBackend"
diff --git a/annuaire/urls.py b/annuaire/urls.py
index 8d2de91..dadfa71 100644
--- a/annuaire/urls.py
+++ b/annuaire/urls.py
@@ -18,13 +18,11 @@ from django.contrib import admin
 from django.urls import path, include
 from django.conf.urls.static import static
 from fiches.views import BirthdayView, HomeView
-import django_cas_ng.views as cas_views
 
 urlpatterns = [
     path("", include("fiches.urls")),
     path("admin/", admin.site.urls),
-    path("accounts/login/", cas_views.LoginView.as_view(), name="cas_ng_login"),
-    path("logout", cas_views.LogoutView.as_view(), name="cas_ng_logout"),
+    path("authens/", include("authens.urls")),
     path("i18n/", include("django.conf.urls.i18n")),
 ]
 
diff --git a/fiches/backends.py b/fiches/backends.py
new file mode 100644
index 0000000..dc00480
--- /dev/null
+++ b/fiches/backends.py
@@ -0,0 +1,19 @@
+from authens.backends import ENSCASBackend, ENSCASError
+from authens.utils import parse_entrance_year
+
+from fiches.models import Profile
+
+
+class BackendFiches(ENSCASBackend):
+    """Wrapper around AuthENS's CAS authentication backend.
+    Ensures the required field promotion year is non-empty"""
+
+    def create_user(self, username, attributes):
+        """create a CAS user
+        overwrite to add required promotion"""
+        user = super().create_user(username, attributes)
+        entrance_year = parse_entrance_year(attributes.get("homeDirectory"))
+        if entrance_year is None:
+            raise ENSCASError("Entrance year not available")
+        Profile.objects.create(user=user, promotion=entrance_year)
+        return user
diff --git a/fiches/templates/fiches/base.html b/fiches/templates/fiches/base.html
index 8d1eecb..72bea43 100644
--- a/fiches/templates/fiches/base.html
+++ b/fiches/templates/fiches/base.html
@@ -50,9 +50,9 @@
       <div id="account-area">
         {% if user.is_authenticated %}
         {% blocktrans %}Connecté en tant que <span class="clipper">{{ user }}</span>{% endblocktrans %}<br />
-        <a href='{% url "cas_ng_logout" %}'>{% trans "Se déconnecter" %}</a>
+        <a href='{% url "authens:logout" %}'>{% trans "Se déconnecter" %}</a>
         {% else %}
-        <a href='{% url "cas_ng_login" %}'>{% trans "Se connecter" %}</a>
+        <a href='{% url "authens:login" %}'>{% trans "Se connecter" %}</a>
         {% endif %}
       </div>
     </div>
diff --git a/requirements.txt b/requirements.txt
index 0192af9..c6e40a1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,5 @@
 django==2.2.*
 Pillow
 django_cas_ng
-python-ldap
\ No newline at end of file
+python-ldap
+authens