diff --git a/README.md b/README.md
index 2e1621b..4dbd601 100644
--- a/README.md
+++ b/README.md
@@ -136,14 +136,14 @@ Here's a complete [example](examples/complete/main.tf) of using this `terraform-
 
 | Name | Version |
 |------|---------|
-| <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 0.13.0 |
-| <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 2.0 |
+| <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 1.0 |
+| <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 4.0 |
 
 ## Providers
 
 | Name | Version |
 |------|---------|
-| <a name="provider_aws"></a> [aws](#provider\_aws) | >= 2.0 |
+| <a name="provider_aws"></a> [aws](#provider\_aws) | >= 4.0 |
 
 ## Modules
 
@@ -164,7 +164,6 @@ Here's a complete [example](examples/complete/main.tf) of using this `terraform-
 | [aws_cloudwatch_metric_alarm.default](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/cloudwatch_metric_alarm) | resource |
 | [aws_sns_topic.default](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/sns_topic) | resource |
 | [aws_sns_topic_policy.default](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/sns_topic_policy) | resource |
-| [aws_caller_identity.current](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/caller_identity) | data source |
 | [aws_caller_identity.default](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/caller_identity) | data source |
 | [aws_iam_policy_document.sns_kms_key_policy](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/iam_policy_document) | data source |
 | [aws_iam_policy_document.sns_topic_policy](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/iam_policy_document) | data source |
diff --git a/alarms.tf b/alarms.tf
index 40e0e6a..30e7b70 100644
--- a/alarms.tf
+++ b/alarms.tf
@@ -1,4 +1,3 @@
-data "aws_caller_identity" "current" {}
 data "aws_region" "current" {}
 
 locals {
@@ -9,7 +8,6 @@ locals {
   log_group_region      = var.log_group_region == "" ? data.aws_region.current.name : var.log_group_region
 
   metric_namespace = var.metric_namespace
-  metric_value     = "1"
   metrics_index    = values(var.metrics)
 }
 
@@ -106,6 +104,6 @@ resource "aws_cloudwatch_dashboard" "individual" {
 locals {
   dashboard_url_prefix = "https://console.aws.amazon.com/cloudwatch/home?region=${local.log_group_region}#dashboards:name="
 
-  dashboard_combined_url   = join("", concat([local.dashboard_url_prefix], aws_cloudwatch_dashboard.combined.*.dashboard_name))
-  dashboard_individual_url = join("", concat([local.dashboard_url_prefix], aws_cloudwatch_dashboard.individual.*.dashboard_name))
+  dashboard_combined_url   = join("", concat([local.dashboard_url_prefix], aws_cloudwatch_dashboard.combined[*].dashboard_name))
+  dashboard_individual_url = join("", concat([local.dashboard_url_prefix], aws_cloudwatch_dashboard.individual[*].dashboard_name))
 }
diff --git a/docs/terraform.md b/docs/terraform.md
index 42529c2..05c06c8 100644
--- a/docs/terraform.md
+++ b/docs/terraform.md
@@ -3,14 +3,14 @@
 
 | Name | Version |
 |------|---------|
-| <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 0.13.0 |
-| <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 2.0 |
+| <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 1.0 |
+| <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 4.0 |
 
 ## Providers
 
 | Name | Version |
 |------|---------|
-| <a name="provider_aws"></a> [aws](#provider\_aws) | >= 2.0 |
+| <a name="provider_aws"></a> [aws](#provider\_aws) | >= 4.0 |
 
 ## Modules
 
@@ -31,7 +31,6 @@
 | [aws_cloudwatch_metric_alarm.default](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/cloudwatch_metric_alarm) | resource |
 | [aws_sns_topic.default](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/sns_topic) | resource |
 | [aws_sns_topic_policy.default](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/sns_topic_policy) | resource |
-| [aws_caller_identity.current](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/caller_identity) | data source |
 | [aws_caller_identity.default](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/caller_identity) | data source |
 | [aws_iam_policy_document.sns_kms_key_policy](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/iam_policy_document) | data source |
 | [aws_iam_policy_document.sns_topic_policy](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/iam_policy_document) | data source |
diff --git a/examples/complete/main.tf b/examples/complete/main.tf
index 7b4cbb7..dbe71bf 100644
--- a/examples/complete/main.tf
+++ b/examples/complete/main.tf
@@ -8,7 +8,7 @@ data "aws_caller_identity" "current" {}
 
 module "cloudtrail_s3_bucket" {
   source  = "cloudposse/cloudtrail-s3-bucket/aws"
-  version = "0.15.0"
+  version = "0.26.0"
 
   force_destroy = true
 
diff --git a/examples/complete/versions.tf b/examples/complete/versions.tf
new file mode 100644
index 0000000..d8dd1a4
--- /dev/null
+++ b/examples/complete/versions.tf
@@ -0,0 +1,10 @@
+terraform {
+  required_version = ">= 1.0"
+
+  required_providers {
+    aws = {
+      source  = "hashicorp/aws"
+      version = ">= 4.0"
+    }
+  }
+}
diff --git a/versions.tf b/versions.tf
index 5b2c49b..d8dd1a4 100644
--- a/versions.tf
+++ b/versions.tf
@@ -1,10 +1,10 @@
 terraform {
-  required_version = ">= 0.13.0"
+  required_version = ">= 1.0"
 
   required_providers {
     aws = {
       source  = "hashicorp/aws"
-      version = ">= 2.0"
+      version = ">= 4.0"
     }
   }
 }