diff --git a/dist/index.js b/dist/index.js
index 086f10a..dc87c1e 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -128,7 +128,6 @@ module.exports = AWS.MediaLive;
 const core = __webpack_require__(6470);
 const aws = __webpack_require__(9350);
 const assert = __webpack_require__(2357);
-const util = __webpack_require__(1669);
 
 // The max time that a GitHub action is allowed to run is 6 hours.
 // That seems like a reasonable default to use if no role duration is defined.
@@ -258,10 +257,9 @@ async function exportAccountId(maskAccountId, region) {
 }
 
 function getStsClient(region) {
-  const endpoint = util.format('https://sts.%s.amazonaws.com', region);
   return new aws.STS({
     region,
-    endpoint,
+    stsRegionalEndpoints: 'regional',
     customUserAgent: USER_AGENT
   });
 }