diff --git a/modules/api_gateway/main.tf b/modules/api_gateway/main.tf
index 06c1b40..ad8cf12 100644
--- a/modules/api_gateway/main.tf
+++ b/modules/api_gateway/main.tf
@@ -1,13 +1,4 @@
 locals {
-  account_id = data.aws_caller_identity.current.account_id
-  integration_lambda_list = [
-    for key, value in var.routes :
-    value["lambda_key"] if lookup(value, "lambda_key", "") != ""
-  ]
-  integration_keys = {
-    for k in distinct(local.integration_lambda_list) :
-    k => ""
-  }
   routes = {
     for key, value in var.routes : trimprefix(key, "/") => {
       method         = lookup(value, "method", "ANY")
@@ -50,7 +41,6 @@ locals {
 }
 
 data "aws_region" "current" {}
-data "aws_caller_identity" "current" {}
 
 data "aws_iam_policy_document" "assume_role" {
   statement {
@@ -108,7 +98,7 @@ resource "aws_iam_role_policy" "invocation_policy" {
             ], [
             for key, value in var.lambdas : replace(value.function_arn, "/:\\d+$/", ":*")
           ])
-        ): e]
+        ) : e]
       }
     ]
   })
diff --git a/modules/api_gateway/versions.tf b/modules/api_gateway/versions.tf
index f728746..036e583 100644
--- a/modules/api_gateway/versions.tf
+++ b/modules/api_gateway/versions.tf
@@ -1,4 +1,6 @@
 terraform {
+  required_version = ">= 1.0"
+
   required_providers {
     aws = {
       source  = "hashicorp/aws"