diff --git a/modules/gke-cluster/README.md b/modules/gke-cluster/README.md
index 19a15a54..4617cae0 100644
--- a/modules/gke-cluster/README.md
+++ b/modules/gke-cluster/README.md
@@ -68,44 +68,44 @@ module "cluster-1" {
 
 | name | description | type | required | default |
 |---|---|:---:|:---:|:---:|
-| [location](variables.tf#L163) | Cluster zone or region. | <code>string</code> | ✓ |  |
-| [name](variables.tf#L230) | Cluster name. | <code>string</code> | ✓ |  |
-| [network](variables.tf#L235) | Name or self link of the VPC used for the cluster. Use the self link for Shared VPC. | <code>string</code> | ✓ |  |
-| [project_id](variables.tf#L279) | Cluster project id. | <code>string</code> | ✓ |  |
-| [secondary_range_pods](variables.tf#L302) | Subnet secondary range name used for pods. | <code>string</code> | ✓ |  |
-| [secondary_range_services](variables.tf#L307) | Subnet secondary range name used for services. | <code>string</code> | ✓ |  |
-| [subnetwork](variables.tf#L312) | VPC subnetwork name or self link. | <code>string</code> | ✓ |  |
+| [location](variables.tf#L159) | Cluster zone or region. | <code>string</code> | ✓ |  |
+| [name](variables.tf#L226) | Cluster name. | <code>string</code> | ✓ |  |
+| [network](variables.tf#L231) | Name or self link of the VPC used for the cluster. Use the self link for Shared VPC. | <code>string</code> | ✓ |  |
+| [project_id](variables.tf#L275) | Cluster project id. | <code>string</code> | ✓ |  |
+| [secondary_range_pods](variables.tf#L298) | Subnet secondary range name used for pods. | <code>string</code> | ✓ |  |
+| [secondary_range_services](variables.tf#L303) | Subnet secondary range name used for services. | <code>string</code> | ✓ |  |
+| [subnetwork](variables.tf#L308) | VPC subnetwork name or self link. | <code>string</code> | ✓ |  |
 | [addons](variables.tf#L17) | Addons enabled in the cluster (true means enabled). | <code title="object&#40;&#123;&#10;  cloudrun_config            &#61; bool&#10;  dns_cache_config           &#61; bool&#10;  horizontal_pod_autoscaling &#61; bool&#10;  http_load_balancing        &#61; bool&#10;  istio_config &#61; object&#40;&#123;&#10;    enabled &#61; bool&#10;    tls     &#61; bool&#10;  &#125;&#41;&#10;  network_policy_config                 &#61; bool&#10;  gce_persistent_disk_csi_driver_config &#61; bool&#10;  gcp_filestore_csi_driver_config       &#61; bool&#10;  config_connector_config               &#61; bool&#10;  kalm_config                           &#61; bool&#10;&#125;&#41;">object&#40;&#123;&#8230;&#125;&#41;</code> |  | <code title="&#123;&#10;  cloudrun_config            &#61; false&#10;  dns_cache_config           &#61; false&#10;  horizontal_pod_autoscaling &#61; true&#10;  http_load_balancing        &#61; true&#10;  istio_config &#61; &#123;&#10;    enabled &#61; false&#10;    tls     &#61; false&#10;  &#125;&#10;  network_policy_config                 &#61; false&#10;  gce_persistent_disk_csi_driver_config &#61; false&#10;  gcp_filestore_csi_driver_config       &#61; false&#10;  config_connector_config               &#61; false&#10;  kalm_config                           &#61; false&#10;&#125;">&#123;&#8230;&#125;</code> |
 | [authenticator_security_group](variables.tf#L51) | RBAC security group for Google Groups for GKE, format is gke-security-groups@yourdomain.com. | <code>string</code> |  | <code>null</code> |
 | [cluster_autoscaling](variables.tf#L57) | Enable and configure limits for Node Auto-Provisioning with Cluster Autoscaler. | <code title="object&#40;&#123;&#10;  enabled    &#61; bool&#10;  cpu_min    &#61; number&#10;  cpu_max    &#61; number&#10;  memory_min &#61; number&#10;  memory_max &#61; number&#10;&#125;&#41;">object&#40;&#123;&#8230;&#125;&#41;</code> |  | <code title="&#123;&#10;  enabled    &#61; false&#10;  cpu_min    &#61; 0&#10;  cpu_max    &#61; 0&#10;  memory_min &#61; 0&#10;  memory_max &#61; 0&#10;&#125;">&#123;&#8230;&#125;</code> |
 | [database_encryption](variables.tf#L75) | Enable and configure GKE application-layer secrets encryption. | <code title="object&#40;&#123;&#10;  enabled  &#61; bool&#10;  state    &#61; string&#10;  key_name &#61; string&#10;&#125;&#41;">object&#40;&#123;&#8230;&#125;&#41;</code> |  | <code title="&#123;&#10;  enabled  &#61; false&#10;  state    &#61; &#34;DECRYPTED&#34;&#10;  key_name &#61; null&#10;&#125;">&#123;&#8230;&#125;</code> |
 | [default_max_pods_per_node](variables.tf#L89) | Maximum number of pods per node in this cluster. | <code>number</code> |  | <code>110</code> |
 | [description](variables.tf#L95) | Cluster description. | <code>string</code> |  | <code>null</code> |
-| [dns_config](variables.tf#L101) | Configuration for Using Cloud DNS for GKE. | <code title="object&#40;&#123;&#10;  cluster_dns        &#61; string&#10;  cluster_dns_scope  &#61; string&#10;  cluster_dns_domain &#61; string&#10;&#125;&#41;">object&#40;&#123;&#8230;&#125;&#41;</code> |  | <code title="&#123;&#10;  cluster_dns        &#61; &#34;PROVIDER_UNSPECIFIED&#34;&#10;  cluster_dns_scope  &#61; &#34;DNS_SCOPE_UNSPECIFIED&#34;&#10;  cluster_dns_domain &#61; &#34;&#34;&#10;&#125;">&#123;&#8230;&#125;</code> |
-| [enable_autopilot](variables.tf#L115) | Create cluster in autopilot mode. With autopilot there's no need to create node-pools and some features are not supported (e.g. setting default_max_pods_per_node). | <code>bool</code> |  | <code>false</code> |
-| [enable_binary_authorization](variables.tf#L121) | Enable Google Binary Authorization. | <code>bool</code> |  | <code>null</code> |
-| [enable_dataplane_v2](variables.tf#L127) | Enable Dataplane V2 on the cluster, will disable network_policy addons config. | <code>bool</code> |  | <code>false</code> |
-| [enable_intranode_visibility](variables.tf#L133) | Enable intra-node visibility to make same node pod to pod traffic visible. | <code>bool</code> |  | <code>null</code> |
-| [enable_l4_ilb_subsetting](variables.tf#L139) | Enable L4ILB Subsetting. | <code>bool</code> |  | <code>null</code> |
-| [enable_shielded_nodes](variables.tf#L145) | Enable Shielded Nodes features on all nodes in this cluster. | <code>bool</code> |  | <code>null</code> |
-| [enable_tpu](variables.tf#L151) | Enable Cloud TPU resources in this cluster. | <code>bool</code> |  | <code>null</code> |
-| [labels](variables.tf#L157) | Cluster resource labels. | <code>map&#40;string&#41;</code> |  | <code>null</code> |
-| [logging_config](variables.tf#L168) | Logging configuration (enabled components). | <code>list&#40;string&#41;</code> |  | <code>null</code> |
-| [logging_service](variables.tf#L174) | Logging service (disable with an empty string). | <code>string</code> |  | <code>&#34;logging.googleapis.com&#47;kubernetes&#34;</code> |
-| [maintenance_config](variables.tf#L180) | Maintenance window configuration. | <code title="object&#40;&#123;&#10;  daily_maintenance_window &#61; object&#40;&#123;&#10;    start_time &#61; string&#10;  &#125;&#41;&#10;  recurring_window &#61; object&#40;&#123;&#10;    start_time &#61; string&#10;    end_time   &#61; string&#10;    recurrence &#61; string&#10;  &#125;&#41;&#10;  maintenance_exclusion &#61; list&#40;object&#40;&#123;&#10;    exclusion_name &#61; string&#10;    start_time     &#61; string&#10;    end_time       &#61; string&#10;  &#125;&#41;&#41;&#10;&#125;&#41;">object&#40;&#123;&#8230;&#125;&#41;</code> |  | <code title="&#123;&#10;  daily_maintenance_window &#61; &#123;&#10;    start_time &#61; &#34;03:00&#34;&#10;  &#125;&#10;  recurring_window      &#61; null&#10;  maintenance_exclusion &#61; &#91;&#93;&#10;&#125;">&#123;&#8230;&#125;</code> |
-| [master_authorized_ranges](variables.tf#L206) | External Ip address ranges that can access the Kubernetes cluster master through HTTPS. | <code>map&#40;string&#41;</code> |  | <code>&#123;&#125;</code> |
-| [min_master_version](variables.tf#L212) | Minimum version of the master, defaults to the version of the most recent official release. | <code>string</code> |  | <code>null</code> |
-| [monitoring_config](variables.tf#L218) | Monitoring configuration (enabled components). | <code>list&#40;string&#41;</code> |  | <code>null</code> |
-| [monitoring_service](variables.tf#L224) | Monitoring service (disable with an empty string). | <code>string</code> |  | <code>&#34;monitoring.googleapis.com&#47;kubernetes&#34;</code> |
-| [node_locations](variables.tf#L240) | Zones in which the cluster's nodes are located. | <code>list&#40;string&#41;</code> |  | <code>&#91;&#93;</code> |
-| [notification_config](variables.tf#L246) | GKE Cluster upgrade notifications via PubSub. | <code>bool</code> |  | <code>false</code> |
-| [peering_config](variables.tf#L252) | Configure peering with the master VPC for private clusters. | <code title="object&#40;&#123;&#10;  export_routes &#61; bool&#10;  import_routes &#61; bool&#10;  project_id    &#61; string&#10;&#125;&#41;">object&#40;&#123;&#8230;&#125;&#41;</code> |  | <code>null</code> |
-| [pod_security_policy](variables.tf#L262) | Enable the PodSecurityPolicy feature. | <code>bool</code> |  | <code>null</code> |
-| [private_cluster_config](variables.tf#L268) | Enable and configure private cluster, private nodes must be true if used. | <code title="object&#40;&#123;&#10;  enable_private_nodes    &#61; bool&#10;  enable_private_endpoint &#61; bool&#10;  master_ipv4_cidr_block  &#61; string&#10;  master_global_access    &#61; bool&#10;&#125;&#41;">object&#40;&#123;&#8230;&#125;&#41;</code> |  | <code>null</code> |
-| [release_channel](variables.tf#L284) | Release channel for GKE upgrades. | <code>string</code> |  | <code>null</code> |
-| [resource_usage_export_config](variables.tf#L290) | Configure the ResourceUsageExportConfig feature. | <code title="object&#40;&#123;&#10;  enabled &#61; bool&#10;  dataset &#61; string&#10;&#125;&#41;">object&#40;&#123;&#8230;&#125;&#41;</code> |  | <code title="&#123;&#10;  enabled &#61; null&#10;  dataset &#61; null&#10;&#125;">&#123;&#8230;&#125;</code> |
-| [vertical_pod_autoscaling](variables.tf#L317) | Enable the Vertical Pod Autoscaling feature. | <code>bool</code> |  | <code>null</code> |
-| [workload_identity](variables.tf#L323) | Enable the Workload Identity feature. | <code>bool</code> |  | <code>true</code> |
+| [dns_config](variables.tf#L101) | Configuration for Using Cloud DNS for GKE. | <code title="object&#40;&#123;&#10;  cluster_dns        &#61; string&#10;  cluster_dns_scope  &#61; string&#10;  cluster_dns_domain &#61; string&#10;&#125;&#41;">object&#40;&#123;&#8230;&#125;&#41;</code> |  | <code>null</code> |
+| [enable_autopilot](variables.tf#L111) | Create cluster in autopilot mode. With autopilot there's no need to create node-pools and some features are not supported (e.g. setting default_max_pods_per_node). | <code>bool</code> |  | <code>false</code> |
+| [enable_binary_authorization](variables.tf#L117) | Enable Google Binary Authorization. | <code>bool</code> |  | <code>null</code> |
+| [enable_dataplane_v2](variables.tf#L123) | Enable Dataplane V2 on the cluster, will disable network_policy addons config. | <code>bool</code> |  | <code>false</code> |
+| [enable_intranode_visibility](variables.tf#L129) | Enable intra-node visibility to make same node pod to pod traffic visible. | <code>bool</code> |  | <code>null</code> |
+| [enable_l4_ilb_subsetting](variables.tf#L135) | Enable L4ILB Subsetting. | <code>bool</code> |  | <code>null</code> |
+| [enable_shielded_nodes](variables.tf#L141) | Enable Shielded Nodes features on all nodes in this cluster. | <code>bool</code> |  | <code>null</code> |
+| [enable_tpu](variables.tf#L147) | Enable Cloud TPU resources in this cluster. | <code>bool</code> |  | <code>null</code> |
+| [labels](variables.tf#L153) | Cluster resource labels. | <code>map&#40;string&#41;</code> |  | <code>null</code> |
+| [logging_config](variables.tf#L164) | Logging configuration (enabled components). | <code>list&#40;string&#41;</code> |  | <code>null</code> |
+| [logging_service](variables.tf#L170) | Logging service (disable with an empty string). | <code>string</code> |  | <code>&#34;logging.googleapis.com&#47;kubernetes&#34;</code> |
+| [maintenance_config](variables.tf#L176) | Maintenance window configuration. | <code title="object&#40;&#123;&#10;  daily_maintenance_window &#61; object&#40;&#123;&#10;    start_time &#61; string&#10;  &#125;&#41;&#10;  recurring_window &#61; object&#40;&#123;&#10;    start_time &#61; string&#10;    end_time   &#61; string&#10;    recurrence &#61; string&#10;  &#125;&#41;&#10;  maintenance_exclusion &#61; list&#40;object&#40;&#123;&#10;    exclusion_name &#61; string&#10;    start_time     &#61; string&#10;    end_time       &#61; string&#10;  &#125;&#41;&#41;&#10;&#125;&#41;">object&#40;&#123;&#8230;&#125;&#41;</code> |  | <code title="&#123;&#10;  daily_maintenance_window &#61; &#123;&#10;    start_time &#61; &#34;03:00&#34;&#10;  &#125;&#10;  recurring_window      &#61; null&#10;  maintenance_exclusion &#61; &#91;&#93;&#10;&#125;">&#123;&#8230;&#125;</code> |
+| [master_authorized_ranges](variables.tf#L202) | External Ip address ranges that can access the Kubernetes cluster master through HTTPS. | <code>map&#40;string&#41;</code> |  | <code>&#123;&#125;</code> |
+| [min_master_version](variables.tf#L208) | Minimum version of the master, defaults to the version of the most recent official release. | <code>string</code> |  | <code>null</code> |
+| [monitoring_config](variables.tf#L214) | Monitoring configuration (enabled components). | <code>list&#40;string&#41;</code> |  | <code>null</code> |
+| [monitoring_service](variables.tf#L220) | Monitoring service (disable with an empty string). | <code>string</code> |  | <code>&#34;monitoring.googleapis.com&#47;kubernetes&#34;</code> |
+| [node_locations](variables.tf#L236) | Zones in which the cluster's nodes are located. | <code>list&#40;string&#41;</code> |  | <code>&#91;&#93;</code> |
+| [notification_config](variables.tf#L242) | GKE Cluster upgrade notifications via PubSub. | <code>bool</code> |  | <code>false</code> |
+| [peering_config](variables.tf#L248) | Configure peering with the master VPC for private clusters. | <code title="object&#40;&#123;&#10;  export_routes &#61; bool&#10;  import_routes &#61; bool&#10;  project_id    &#61; string&#10;&#125;&#41;">object&#40;&#123;&#8230;&#125;&#41;</code> |  | <code>null</code> |
+| [pod_security_policy](variables.tf#L258) | Enable the PodSecurityPolicy feature. | <code>bool</code> |  | <code>null</code> |
+| [private_cluster_config](variables.tf#L264) | Enable and configure private cluster, private nodes must be true if used. | <code title="object&#40;&#123;&#10;  enable_private_nodes    &#61; bool&#10;  enable_private_endpoint &#61; bool&#10;  master_ipv4_cidr_block  &#61; string&#10;  master_global_access    &#61; bool&#10;&#125;&#41;">object&#40;&#123;&#8230;&#125;&#41;</code> |  | <code>null</code> |
+| [release_channel](variables.tf#L280) | Release channel for GKE upgrades. | <code>string</code> |  | <code>null</code> |
+| [resource_usage_export_config](variables.tf#L286) | Configure the ResourceUsageExportConfig feature. | <code title="object&#40;&#123;&#10;  enabled &#61; bool&#10;  dataset &#61; string&#10;&#125;&#41;">object&#40;&#123;&#8230;&#125;&#41;</code> |  | <code title="&#123;&#10;  enabled &#61; null&#10;  dataset &#61; null&#10;&#125;">&#123;&#8230;&#125;</code> |
+| [vertical_pod_autoscaling](variables.tf#L313) | Enable the Vertical Pod Autoscaling feature. | <code>bool</code> |  | <code>null</code> |
+| [workload_identity](variables.tf#L319) | Enable the Workload Identity feature. | <code>bool</code> |  | <code>true</code> |
 
 ## Outputs
 
@@ -121,4 +121,4 @@ module "cluster-1" {
 | [notifications](outputs.tf#L55) | GKE PubSub notifications topic. |  |
 | [self_link](outputs.tf#L60) | Cluster self link. | ✓ |
 
-<!-- END TFDOC -->
\ No newline at end of file
+<!-- END TFDOC -->
diff --git a/modules/gke-cluster/main.tf b/modules/gke-cluster/main.tf
index d8b5aff3..f82279bf 100644
--- a/modules/gke-cluster/main.tf
+++ b/modules/gke-cluster/main.tf
@@ -278,12 +278,11 @@ resource "google_container_cluster" "cluster" {
   }
 
   dynamic "dns_config" {
-    for_each = var.dns_config != null ? [var.dns_config] : []
-    iterator = config
+    for_each = var.dns_config != null ? [""] : []
     content {
-      cluster_dns        = config.value.cluster_dns
-      cluster_dns_scope  = config.value.cluster_dns_scope
-      cluster_dns_domain = config.value.cluster_dns_domain
+      cluster_dns        = var.dns_config.cluster_dns
+      cluster_dns_scope  = var.dns_config.cluster_dns_scope
+      cluster_dns_domain = var.dns_config.cluster_dns_domain
     }
   }
 
diff --git a/modules/gke-cluster/variables.tf b/modules/gke-cluster/variables.tf
index d3043bda..487aff53 100644
--- a/modules/gke-cluster/variables.tf
+++ b/modules/gke-cluster/variables.tf
@@ -105,11 +105,7 @@ variable "dns_config" {
     cluster_dns_scope  = string
     cluster_dns_domain = string
   })
-  default = {
-    cluster_dns        = "PROVIDER_UNSPECIFIED"
-    cluster_dns_scope  = "DNS_SCOPE_UNSPECIFIED"
-    cluster_dns_domain = ""
-  }
+  default = null
 }
 
 variable "enable_autopilot" {