diff --git a/src/base/BaseTwilio.ts b/src/base/BaseTwilio.ts
index 7c8d900543..05c0f02d6d 100644
--- a/src/base/BaseTwilio.ts
+++ b/src/base/BaseTwilio.ts
@@ -1,5 +1,6 @@
 import RequestClient from "./RequestClient"; /* jshint ignore:line */
 import { HttpMethod } from "../interfaces"; /* jshint ignore:line */
+import { Headers } from "../http/request"; /* jshint ignore:line */
 
 const os = require("os"); /* jshint ignore:line */
 const url = require("url"); /* jshint ignore:line */
@@ -143,7 +144,7 @@ namespace Twilio {
       const username = opts.username || this.username;
       const password = opts.password || this.password;
 
-      const headers: any = opts.headers || {};
+      const headers = opts.headers || {};
 
       const pkgVersion = moduleInfo.version;
       const osName = os.platform();
diff --git a/tsconfig.json b/tsconfig.json
index a99ed63d38..3e0fc0a952 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,6 +1,7 @@
 {
   "compilerOptions": {
     "target": "es2020",
+    "lib": ["es2020"],
     "module": "commonjs",
     "declaration": true,
     "esModuleInterop": true,