diff --git a/package.json b/package.json
index f918670b..d22f448c 100644
--- a/package.json
+++ b/package.json
@@ -41,7 +41,6 @@
   },
   "dependencies": {
     "async-validator": "^1.8.2",
-    "core-js": "^2.5.3",
     "deepmerge": "^1.5.2",
     "element-resize-detector": "^1.1.12",
     "lodash.throttle": "^4.1.1",
diff --git a/src/index.js b/src/index.js
index 5daf1834..ee7d67dc 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,7 +1,3 @@
-// es6 polyfill
-import 'core-js/fn/array/find';
-import 'core-js/fn/array/find-index';
-
 import Affix from './components/affix';
 import Alert from './components/alert';
 import AutoComplete from './components/auto-complete';
diff --git a/yarn.lock b/yarn.lock
index 00c274b3..f86c80bf 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1838,7 +1838,7 @@ core-js@^1.0.0:
   version "1.2.7"
   resolved "https://registry.yarnpkg.com/core-js/-/core-js-1.2.7.tgz#652294c14651db28fa93bd2d5ff2983a4f08c636"
 
-core-js@^2.2.0, core-js@^2.4.0, core-js@^2.5.0, core-js@^2.5.3:
+core-js@^2.2.0, core-js@^2.4.0, core-js@^2.5.0:
   version "2.5.3"
   resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.5.3.tgz#8acc38345824f16d8365b7c9b4259168e8ed603e"