diff --git a/scripts/upgrade b/scripts/upgrade
index 4676115..2cc29ae 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -49,6 +49,10 @@ ynh_app_setting_delete --app=$app --key=email # also delete unnecessary duplicat
 email_fullname="$(ynh_user_get_info --username=$admin --key=fullname)"
 email="$(ynh_user_get_info --username=$admin --key=mail)"
 
+api_secret="$(ynh_string_random --length=32)"
+app_key="$(ynh_string_random --length=32)"
+phantomjs_key="$(ynh_string_random --length=32)"
+
 #=================================================
 # UPDATE A CONFIG FILE
 #=================================================