diff --git a/scripts/upgrade b/scripts/upgrade
index c7de781..33321de 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -27,6 +27,8 @@ user_home=$(ynh_app_setting_get --app=$app --key=user_home)
 fpm_footprint=$(ynh_app_setting_get --app=$app --key=fpm_footprint)
 fpm_usage=$(ynh_app_setting_get --app=$app --key=fpm_usage)
 
+unprotected_uris=$(ynh_app_setting_get $app unprotected_uris)
+
 #=================================================
 # CHECK VERSION
 #=================================================
@@ -65,6 +67,13 @@ if [ -z "$fpm_usage" ]; then
 	ynh_app_setting_set --app=$app --key=fpm_usage --value=$fpm_usage
 fi
 
+# Delete unprotected_uris if it exists
+if [ ! -z $unprotected_uris ]; then
+	ynh_app_setting_delete $app unprotected_uris
+    # Delete unprotected_uris implicitly remove visitors, add it again.
+    ynh_permission_update --permission "main" --add "visitors"
+fi
+
 #=================================================
 # BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
 #=================================================