diff --git a/common/settings.py b/common/settings.py
index ffb3cd4..b6dabcc 100644
--- a/common/settings.py
+++ b/common/settings.py
@@ -103,6 +103,9 @@ STATICFILES_STORAGE = 'django.contrib.staticfiles.storage.ManifestStaticFilesSto
 
 ALLOWED_HOSTS = ['localhost', 'stages.pierre-coullery.ch']
 
+# candidats admin shows confirmation_date readonly field twice.
+SILENCED_SYSTEM_CHECKS = ['admin.E012']
+
 FABRIC_HOST = 'stages.pierre-coullery.ch'
 FABRIC_USERNAME = ''
 
diff --git a/requirements.txt b/requirements.txt
index 3bbde5b..5a274ad 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-Django==2.0.1
+Django>=2.0.1,<=2.2
 tabimport>=0.4.0
 openpyxl==2.4.9
 xlrd
diff --git a/templates/admin/index.html b/templates/admin/index.html
index 92d8cdc..7551e89 100644
--- a/templates/admin/index.html
+++ b/templates/admin/index.html
@@ -1,5 +1,5 @@
 {% extends "admin/base_site.html" %}
-{% load i18n admin_static %}
+{% load i18n static %}
 
 {% block extrastyle %}{{ block.super }}
   <link rel="stylesheet" type="text/css" href="{% static 'admin/css/dashboard.css' %}">
diff --git a/templates/attribution.html b/templates/attribution.html
index 0a54fea..3872ae7 100644
--- a/templates/attribution.html
+++ b/templates/attribution.html
@@ -1,5 +1,5 @@
 {% extends "admin/base_site.html" %}
-{% load i18n admin_static %}
+{% load i18n static %}
 
 {% block extrastyle %}{{ block.super }}
 <style>