diff --git a/main.tf b/main.tf
index 455c037..1129d34 100644
--- a/main.tf
+++ b/main.tf
@@ -1,6 +1,5 @@
 locals {
   resource_name_prefix = "${var.namespace}-${var.resource_tag_name}"
-  api_url              = "${aws_api_gateway_deployment._.invoke_url}${aws_api_gateway_stage._.stage_name}"
   api_name             = "${local.resource_name_prefix}-${var.api_name}"
 }
 
@@ -10,6 +9,10 @@ data "template_file" "_" {
   vars = var.api_template_vars
 }
 
+data "aws_api_gateway_domain_name" "_" {
+  domain_name = var.api_domain_name
+}
+
 resource "aws_api_gateway_rest_api" "_" {
   name           = local.api_name
   api_key_source = "HEADER"
@@ -24,8 +27,8 @@ resource "aws_api_gateway_deployment" "_" {
   lifecycle {
     create_before_destroy = true
   }
-  
-  # Triggers a re-deployment to the stage   
+
+  # Triggers a re-deployment to the stage
   triggers = {
     redeployment = base64sha256(data.template_file._.template)
   }
@@ -58,8 +61,26 @@ resource "aws_api_gateway_method_settings" "_" {
   }
 }
 
+#
+# Domain Setup
+#
+resource "aws_api_gateway_domain_name" "_" {
+  domain_name              = var.api_domain_name
+  endpoint_configuration {
+    types = ["REGIONAL"]
+  }
+  regional_certificate_arn = var.acm_certificate_arn
+  security_policy = "TLS_1_2"
+}
+
+resource "aws_api_gateway_base_path_mapping" "_" {
+  api_id      = aws_api_gateway_rest_api._.id
+  domain_name = aws_api_gateway_domain_name._.domain_name
+  stage_name  = aws_api_gateway_stage._.stage_name
+}
+
 # -----------------------------------------------------------------------------
-# CloudWatch: API Gateway 
+# CloudWatch: API Gateway
 # -----------------------------------------------------------------------------
 module "cloudwatch_alarms_apigateway" {
   source = "./cloudwatch-alarms-apigateway"
diff --git a/outputs.tf b/outputs.tf
index 46a55d0..6101dd1 100644
--- a/outputs.tf
+++ b/outputs.tf
@@ -7,7 +7,11 @@ output "rest_api_id" {
 }
 
 output "api_url" {
-  value = local.api_url
+  value = aws_api_gateway_deployment._.invoke_url
+}
+
+output "api_domain_name" {
+  value = data.aws_api_gateway_domain_name._.regional_domain_name
 }
 
 output "api_name" {
@@ -16,4 +20,4 @@ output "api_name" {
 
 output "api_stage" {
   value = aws_api_gateway_stage._.stage_name
-}
\ No newline at end of file
+}
diff --git a/variables.tf b/variables.tf
index a4d26fd..8a1219f 100644
--- a/variables.tf
+++ b/variables.tf
@@ -8,6 +8,8 @@ variable "namespace" {
 
 variable "region" {
   description = "AWS region"
+  type        = string
+  default     = "us-east-1"
 }
 
 variable "resource_tag_name" {
@@ -27,7 +29,17 @@ variable "api_template" {
 
 variable "api_template_vars" {
   description = "Variables required in the OpenAPI template file"
-  type        = map
+  type        = map(string)
+}
+
+variable "api_domain_name" {
+  description = "Domain name of the API Gateway REST API for self-signed TLS certificate"
+  type        = string
+}
+
+variable "acm_certificate_arn" {
+  description = "The ARN of the ACM certificate to use for the custom domain name"
+  type        = string
 }
 
 variable "api_throttling_rate_limit" {
@@ -67,7 +79,7 @@ variable "xray_tracing_enabled" {
 # -----------------------------------------------------------------------------
 variable "resources" {
   description = "Methods that have Cloudwatch alarms enabled"
-  type        = map
+  type        = map(string)
 }
 
 variable "latency_threshold_p95" {
@@ -113,4 +125,4 @@ variable "fiveRate_evaluationPeriods" {
   description = "How many periods are evaluated before the alarm is triggered"
   default     = 5
   type        = number
-}
\ No newline at end of file
+}
diff --git a/versions.tf b/versions.tf
index ac97c6a..9d58500 100644
--- a/versions.tf
+++ b/versions.tf
@@ -1,4 +1,4 @@
 
 terraform {
-  required_version = ">= 0.12"
+  required_version = ">= 0.14"
 }