diff --git a/modules/resource-group/README.md b/modules/resource-group/README.md
index 348fae5..5cb4712 100644
--- a/modules/resource-group/README.md
+++ b/modules/resource-group/README.md
@@ -9,14 +9,14 @@ This module creates following resources.
 
 | Name | Version |
 |------|---------|
-| <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 1.1 |
+| <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 1.5 |
 | <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 4.14 |
 
 ## Providers
 
 | Name | Version |
 |------|---------|
-| <a name="provider_aws"></a> [aws](#provider\_aws) | 4.16.0 |
+| <a name="provider_aws"></a> [aws](#provider\_aws) | 5.15.0 |
 
 ## Modules
 
@@ -35,7 +35,7 @@ No modules.
 | <a name="input_name"></a> [name](#input\_name) | (Required) A name to identify the resource group. A resource group name can have a maximum of 127 characters, including letters, numbers, hyphens, dots, and underscores. The name cannot start with `AWS` or `aws`. | `string` | n/a | yes |
 | <a name="input_description"></a> [description](#input\_description) | (Optional) The description of the resource group. | `string` | `"Managed by Terraform."` | no |
 | <a name="input_module_tags_enabled"></a> [module\_tags\_enabled](#input\_module\_tags\_enabled) | (Optional) Whether to create AWS Resource Tags for the module informations. | `bool` | `true` | no |
-| <a name="input_query"></a> [query](#input\_query) | (Optional) A configuration for the actual query used to match against resources. It supports `resource_types` and `resource_tags`. `query` block as defined below.<br>    (Required) `resource_tags` - A map of key/value pairs that are compared to the tags attached to resources.<br>    (Optional) `resource_types` - A list of resource-type specification strings with `AWS::service-id::resource-type` format. Limit the results to only those resource types that match the filter. Specify `AWS::AllSupported` to include resources of any resources that are currently supported by Resource Group. | `any` | `{}` | no |
+| <a name="input_query"></a> [query](#input\_query) | (Optional) A configuration for the actual query used to match against resources. It supports `resource_types` and `resource_tags`. `query` block as defined below.<br>    (Optional) `resource_tags` - A map of key/value pairs that are compared to the tags attached to resources.<br>    (Optional) `resource_types` - A list of resource-type specification strings with `AWS::service-id::resource-type` format. Limit the results to only those resource types that match the filter. Specify `AWS::AllSupported` to include resources of any resources that are currently supported by Resource Group. | <pre>object({<br>    resource_tags  = optional(map(string), {})<br>    resource_types = optional(list(string), ["AWS::AllSupported"])<br>  })</pre> | `{}` | no |
 | <a name="input_tags"></a> [tags](#input\_tags) | (Optional) A map of tags to add to all resources. | `map(string)` | `{}` | no |
 
 ## Outputs
diff --git a/modules/resource-group/main.tf b/modules/resource-group/main.tf
index 1efd8b3..fe9e009 100644
--- a/modules/resource-group/main.tf
+++ b/modules/resource-group/main.tf
@@ -21,14 +21,14 @@ locals {
 
 locals {
   filters = [
-    for key, value in try(var.query.resource_tags, {}) : {
+    for key, value in var.query.resource_tags : {
       "Key"    = key
       "Values" = flatten([value])
     }
   ]
   query = <<-JSON
   {
-    "ResourceTypeFilters": ${jsonencode(try(var.query.resource_types, ["AWS::AllSupported"]))},
+    "ResourceTypeFilters": ${jsonencode(var.query.resource_types)},
     "TagFilters": ${jsonencode(local.filters)}
   }
   JSON
diff --git a/modules/resource-group/outputs.tf b/modules/resource-group/outputs.tf
index 1e0f6ea..4ddf8a8 100644
--- a/modules/resource-group/outputs.tf
+++ b/modules/resource-group/outputs.tf
@@ -15,10 +15,10 @@ output "description" {
 
 output "resource_types" {
   description = "The resource types used by the resource group to query resources."
-  value       = try(var.query.resource_types, ["AWS::AllSupported"])
+  value       = var.query.resource_types
 }
 
 output "resource_tags" {
   description = "The resource tags used by the resource group to query resources."
-  value       = try(var.query.resource_tags, {})
+  value       = var.query.resource_tags
 }
diff --git a/modules/resource-group/variables.tf b/modules/resource-group/variables.tf
index 6ae4201..70b82c2 100644
--- a/modules/resource-group/variables.tf
+++ b/modules/resource-group/variables.tf
@@ -1,32 +1,40 @@
 variable "name" {
   description = "(Required) A name to identify the resource group. A resource group name can have a maximum of 127 characters, including letters, numbers, hyphens, dots, and underscores. The name cannot start with `AWS` or `aws`."
   type        = string
+  nullable    = false
 }
 
 variable "description" {
   description = "(Optional) The description of the resource group."
   type        = string
   default     = "Managed by Terraform."
+  nullable    = false
 }
 
 variable "query" {
   description = <<EOF
   (Optional) A configuration for the actual query used to match against resources. It supports `resource_types` and `resource_tags`. `query` block as defined below.
-    (Required) `resource_tags` - A map of key/value pairs that are compared to the tags attached to resources.
+    (Optional) `resource_tags` - A map of key/value pairs that are compared to the tags attached to resources.
     (Optional) `resource_types` - A list of resource-type specification strings with `AWS::service-id::resource-type` format. Limit the results to only those resource types that match the filter. Specify `AWS::AllSupported` to include resources of any resources that are currently supported by Resource Group.
   EOF
-  type        = any
-  default     = {}
+  type = object({
+    resource_tags  = optional(map(string), {})
+    resource_types = optional(list(string), ["AWS::AllSupported"])
+  })
+  default  = {}
+  nullable = false
 }
 
 variable "tags" {
   description = "(Optional) A map of tags to add to all resources."
   type        = map(string)
   default     = {}
+  nullable    = false
 }
 
 variable "module_tags_enabled" {
   description = "(Optional) Whether to create AWS Resource Tags for the module informations."
   type        = bool
   default     = true
+  nullable    = false
 }
diff --git a/modules/resource-group/versions.tf b/modules/resource-group/versions.tf
index 9c76940..283cac8 100644
--- a/modules/resource-group/versions.tf
+++ b/modules/resource-group/versions.tf
@@ -1,5 +1,5 @@
 terraform {
-  required_version = ">= 1.1"
+  required_version = ">= 1.5"
 
   required_providers {
     aws = {