diff --git a/package-lock.json b/package-lock.json
index f8ea6a1a..a4063209 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,7 +12,6 @@
         "@babel/runtime": "^7.29.7",
         "botframework-streaming": "^4.23.3",
         "buffer": "6.0.3",
-        "core-js": "^3.49.0",
         "jwt-decode": "3.1.2",
         "rxjs": "5.5.12",
         "url-search-params-polyfill": "^8.2.5"
@@ -4777,6 +4776,7 @@
       "version": "3.49.0",
       "resolved": "https://registry.npmjs.org/core-js/-/core-js-3.49.0.tgz",
       "integrity": "sha512-es1U2+YTtzpwkxVLwAFdSpaIMyQaq0PBgm3YD1W3Qpsn1NAmO3KSgZfu+oGSWVu6NvLHoHCV/aYcsE5wiB7ALg==",
+      "dev": true,
       "hasInstallScript": true,
       "license": "MIT",
       "funding": {
diff --git a/package.json b/package.json
index 183d561c..2bd67900 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,6 @@
     "@babel/runtime": "^7.29.7",
     "botframework-streaming": "^4.23.3",
     "buffer": "6.0.3",
-    "core-js": "^3.49.0",
     "jwt-decode": "3.1.2",
     "rxjs": "5.5.12",
     "url-search-params-polyfill": "^8.2.5"
diff --git a/src/directLine.ts b/src/directLine.ts
index c7c97e3f..f84fdc87 100644
--- a/src/directLine.ts
+++ b/src/directLine.ts
@@ -1,6 +1,5 @@
 // In order to keep file size down, only import the parts of rxjs that we use
 
-import 'core-js/features/promise';
 import 'url-search-params-polyfill';
 import { AjaxResponse, AjaxCreationMethod, AjaxRequest, AjaxError } from 'rxjs/observable/dom/AjaxObservable';
 import { BehaviorSubject } from 'rxjs/BehaviorSubject';