diff --git a/conf/ldap.exs b/conf/ldap.exs
new file mode 100644
index 0000000..692720e
--- /dev/null
+++ b/conf/ldap.exs
@@ -0,0 +1,11 @@
+config :mobilizon, Mobilizon.Service.Auth.Authenticator, Mobilizon.Service.Auth.LDAPAuthenticator
+config :mobilizon, :ldap,
+  enabled: true,
+  host: "localhost",
+  port: 389,
+  ssl: false,
+  # sslopts: [],
+  tls: false,
+  # tlsopts: [],
+  base: "ou=users,dc=yunohost,dc=org",
+  uid:  "uid"
diff --git a/scripts/install b/scripts/install
index 74fbefd..a691d98 100644
--- a/scripts/install
+++ b/scripts/install
@@ -155,6 +155,7 @@ pushd $final_path/$app
     sudo -u "$app" MIX_ENV=prod mix deps.get
     sudo -u "$app" MIX_ENV=prod mix compile
     sudo -u "$app" MIX_ENV=prod mix mobilizon.instance gen --force --output $config --output-psql /tmp/setup_db.psql --domain $domain --instance-name $name --admin-email $admin_email --dbhost localhost --dbname $db_name --dbuser $db_user --dbpass $db_pwd --listen-port $port
+    cat "../conf/ldap.exs" >> "$config"
     ynh_secure_remove --file="/tmp/setup_db.psql"
     sudo -u "$app" MIX_ENV=prod mix ecto.migrate
     sudo -u "$app" MIX_ENV=prod mix mobilizon.users.new "$admin_email" --admin --password "$password"
diff --git a/scripts/upgrade b/scripts/upgrade
index c48cb70..a1f7624 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -91,6 +91,23 @@ ynh_script_progression --message="Stopping a systemd service..."
 
 ynh_systemd_action --service_name=$app --action="stop" --log_path=systemd --line_match="Stopped"
 
+#=================================================
+# UPGRADE FROM PREVIOUS VERSION
+#=================================================
+
+if ynh_version_gt "1.0.0-rc1~ynh1" "${previous_version}" ; then
+	ynh_script_progression --message="Upgrade configuration to 1.0.0-rc1~ynh1..."
+
+	config="$final_path/$app/config/prod.secret.exs"
+	ynh_backup_if_checksum_is_different --file="$config"
+
+	# Implement ldap
+	cat "../conf/ldap.exs" >> "$config"
+	
+	# Recalculate and store the checksum of the file for the next upgrade.
+	ynh_store_file_checksum --file="$config"
+fi
+
 #=================================================
 # DOWNLOAD, CHECK AND UNPACK SOURCE
 #=================================================