diff --git a/common/versions.tf b/common/versions.tf
index 0459582..74b46e5 100644
--- a/common/versions.tf
+++ b/common/versions.tf
@@ -1,4 +1,5 @@
 terraform {
+  experiments = [module_variable_optional_attrs]
   required_providers {
     aws = {
       source  = "hashicorp/aws"