diff --git a/index.js b/index.js
index ed2ad7c..8f2d0ed 100644
--- a/index.js
+++ b/index.js
@@ -6,7 +6,7 @@ const zlib = require('zlib');
 const { Buffer } = require('buffer');
 const { promisify } = require('util');
 
-const AWS = require('aws-sdk');
+const { S3Client, PutObjectCommand } = require('@aws-sdk/client-s3');
 const sharp = require('sharp');
 const _ = require('lodash');
 const debug = require('debug')('nodemailer-base64-to-s3');
@@ -46,14 +46,7 @@ const base64ToS3 = (options = {}) => {
   if (_.startsWith(opts.dir, '/')) opts.dir = opts.dir.slice(1);
 
   // prepare AWS upload using config
-  const s3 = new AWS.S3(opts.aws);
-
-  // we cannot currently use this since it does not return a promise
-  // <https://github.com/aws/aws-sdk-js/pull/1079>
-  // await s3obj.upload({ Body }).promise();
-  //
-  // so instead we use promisify to convert it to a promise
-  const upload = promisify(s3.upload).bind(s3);
+  const s3Client = new S3Client(opts.aws);
 
   async function compile(mail, fn) {
     try {
@@ -124,6 +117,7 @@ const base64ToS3 = (options = {}) => {
     const Key = `${opts.dir}${fileName}`;
 
     const obj = {
+      ...opts.aws.params,
       Key,
       ACL: 'public-read',
       Body,
@@ -135,7 +129,9 @@ const base64ToS3 = (options = {}) => {
     // use a fallback dir if the upload fails
     // but only if the environment is not production
     try {
-      const data = cache[Key] ? cache[Key] : await upload(obj);
+      const data = cache[Key]
+        ? cache[Key]
+        : await s3Client.send(new PutObjectCommand(obj));
       if (cache[Key]) debug(`hitting cache for ${Key}`);
 
       const replacement = isSANB(opts.cloudFrontDomainName)
diff --git a/package.json b/package.json
index 79fc21d..fd1862d 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
     "Nick Baugh <niftylettuce@gmail.com> (http://niftylettuce.com/)"
   ],
   "dependencies": {
-    "aws-sdk": "^2.1152.0",
+    "@aws-sdk/client-s3": "^3.373.0",
     "debug": "^4.3.4",
     "is-string-and-not-blank": "^0.0.2",
     "lodash": "^4.17.21",
@@ -30,7 +30,7 @@
     "cheerio": "^1.0.0-rc.11",
     "cross-env": "^7.0.3",
     "dotenv": "^16.0.1",
-    "eslint": "^8.17.0",
+    "eslint": "8.39.0",
     "eslint-config-xo-lass": "^2.0.1",
     "fixpack": "^4.0.0",
     "husky": "^8.0.1",
diff --git a/test/test.js b/test/test.js
index 6a7000f..06662d6 100644
--- a/test/test.js
+++ b/test/test.js
@@ -30,6 +30,7 @@ transport.use(
     dir: 'nodemailer/',
     cloudFrontDomainName: process.env.AWS_CLOUDFRONT_DOMAIN,
     aws: {
+      region: process.env.AWS_REGION,
       accessKeyId: process.env.AWS_ACCESS_KEY_ID,
       secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY,
       params: {