diff --git a/scripts/upgrade b/scripts/upgrade
index 0bdcc61..0f009ac 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -35,6 +35,10 @@ ynh_app_setting_delete --key=email # also delete unnecessary duplicate of state
 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
 #=================================================