diff --git a/modules/1ad4goodBidAdapter.js b/modules/1ad4goodBidAdapter.js
index 560808b368f..ed536f2a2bb 100644
--- a/modules/1ad4goodBidAdapter.js
+++ b/modules/1ad4goodBidAdapter.js
@@ -1,8 +1,8 @@
 import * as utils from '../src/utils.js';
 import { registerBidder } from '../src/adapters/bidderFactory.js';
 import { BANNER, VIDEO } from '../src/mediaTypes.js';
-import find from 'core-js/library/fn/array/find.js';
-import includes from 'core-js/library/fn/array/includes.js';
+import find from 'core-js-pure/features/array/find';
+import includes from 'core-js-pure/features/array/includes';
 
 const BIDDER_CODE = '1ad4good';
 const URL = 'https://hb.1ad4good.org/prebid';
diff --git a/modules/adagioBidAdapter.js b/modules/adagioBidAdapter.js
index 3bf5eb5d34d..a57caa994d1 100644
--- a/modules/adagioBidAdapter.js
+++ b/modules/adagioBidAdapter.js
@@ -1,4 +1,4 @@
-import find from 'core-js/library/fn/array/find.js';
+import find from 'core-js-pure/features/array/find';
 import * as utils from '../src/utils.js';
 import {registerBidder} from '../src/adapters/bidderFactory.js';
 import { loadExternalScript } from '../src/adloader.js'
diff --git a/modules/adkernelBidAdapter.js b/modules/adkernelBidAdapter.js
index 18c60c3e438..2409a9f578c 100644
--- a/modules/adkernelBidAdapter.js
+++ b/modules/adkernelBidAdapter.js
@@ -1,8 +1,8 @@
 import * as utils from '../src/utils.js';
 import { BANNER, VIDEO } from '../src/mediaTypes.js';
 import {registerBidder} from '../src/adapters/bidderFactory.js';
-import find from 'core-js/library/fn/array/find.js';
-import includes from 'core-js/library/fn/array/includes.js';
+import find from 'core-js-pure/features/array/find';
+import includes from 'core-js-pure/features/array/includes';
 import {parse as parseUrl} from '../src/url.js';
 
 /*
diff --git a/modules/adomikAnalyticsAdapter.js b/modules/adomikAnalyticsAdapter.js
index ec5923ea0f8..62431d0facd 100644
--- a/modules/adomikAnalyticsAdapter.js
+++ b/modules/adomikAnalyticsAdapter.js
@@ -2,8 +2,8 @@ import adapter from '../src/AnalyticsAdapter.js';
 import CONSTANTS from '../src/constants.json';
 import adapterManager from '../src/adapterManager.js';
 import { logInfo } from '../src/utils.js';
-import find from 'core-js/library/fn/array/find.js';
-import findIndex from 'core-js/library/fn/array/find-index.js';
+import find from 'core-js-pure/features/array/find';
+import findIndex from 'core-js-pure/features/array/find-index';
 
 // Events used in adomik analytics adapter
 const auctionInit = CONSTANTS.EVENTS.AUCTION_INIT;
diff --git a/modules/adpod.js b/modules/adpod.js
index a2d5cb4a0ed..c4109aefa66 100644
--- a/modules/adpod.js
+++ b/modules/adpod.js
@@ -20,12 +20,12 @@ import { setupBeforeHookFnOnce, module } from '../src/hook.js';
 import { store } from '../src/videoCache.js';
 import { config } from '../src/config.js';
 import { ADPOD } from '../src/mediaTypes.js';
-import Set from 'core-js/library/fn/set.js';
-import find from 'core-js/library/fn/array/find.js';
+import Set from 'core-js-pure/features/set';
+import find from 'core-js-pure/features/array/find';
 import { auctionManager } from '../src/auctionManager.js';
 import CONSTANTS from '../src/constants.json';
 
-const from = require('core-js/library/fn/array/from.js');
+const from = require('core-js-pure/features/array/from');
 
 const TARGETING_KEY_PB_CAT_DUR = 'hb_pb_cat_dur';
 const TARGETING_KEY_CACHE_ID = 'hb_cache_id';
diff --git a/modules/adtelligentBidAdapter.js b/modules/adtelligentBidAdapter.js
index 2d3162b435d..0cfb90990c8 100644
--- a/modules/adtelligentBidAdapter.js
+++ b/modules/adtelligentBidAdapter.js
@@ -2,7 +2,7 @@ import * as utils from '../src/utils.js';
 import {registerBidder} from '../src/adapters/bidderFactory.js';
 import {VIDEO, BANNER} from '../src/mediaTypes.js';
 import {Renderer} from '../src/Renderer.js';
-import find from 'core-js/library/fn/array/find.js';
+import find from 'core-js-pure/features/array/find';
 
 const URL = 'https://ghb.adtelligent.com/auction/';
 const OUTSTREAM_SRC = 'https://player.adtelligent.com/outstream-unit/2.01/outstream.min.js';
diff --git a/modules/advangelistsBidAdapter.js b/modules/advangelistsBidAdapter.js
index b3064568d3a..ad744d64bf8 100644
--- a/modules/advangelistsBidAdapter.js
+++ b/modules/advangelistsBidAdapter.js
@@ -3,8 +3,8 @@ import { parse as parseUrl } from '../src/url.js';
 import { config } from '../src/config.js';
 import { registerBidder } from '../src/adapters/bidderFactory.js';
 import { VIDEO, BANNER } from '../src/mediaTypes.js';
-import find from 'core-js/library/fn/array/find.js';
-import includes from 'core-js/library/fn/array/includes.js';
+import find from 'core-js-pure/features/array/find';
+import includes from 'core-js-pure/features/array/includes';
 
 const ADAPTER_VERSION = '1.0';
 const BIDDER_CODE = 'advangelists';
diff --git a/modules/adxcgBidAdapter.js b/modules/adxcgBidAdapter.js
index 37690c66d58..f1e1a93977e 100644
--- a/modules/adxcgBidAdapter.js
+++ b/modules/adxcgBidAdapter.js
@@ -3,7 +3,7 @@ import * as utils from '../src/utils.js'
 import * as url from '../src/url.js'
 import { registerBidder } from '../src/adapters/bidderFactory.js'
 import { BANNER, NATIVE, VIDEO } from '../src/mediaTypes.js'
-import includes from 'core-js/library/fn/array/includes.js'
+import includes from 'core-js-pure/features/array/includes'
 
 /**
  * Adapter for requesting bids from adxcg.net
diff --git a/modules/adyoulikeBidAdapter.js b/modules/adyoulikeBidAdapter.js
index 7e591b3901c..7ccd9d665ef 100644
--- a/modules/adyoulikeBidAdapter.js
+++ b/modules/adyoulikeBidAdapter.js
@@ -2,7 +2,7 @@ import * as utils from '../src/utils.js';
 import { format } from '../src/url.js';
 // import { config } from '../src/config.js';
 import { registerBidder } from '../src/adapters/bidderFactory.js';
-import find from 'core-js/library/fn/array/find.js';
+import find from 'core-js-pure/features/array/find';
 
 const VERSION = '1.0';
 const BIDDER_CODE = 'adyoulike';
diff --git a/modules/appnexusBidAdapter.js b/modules/appnexusBidAdapter.js
index 9f107bf54ec..a79607b9e9d 100644
--- a/modules/appnexusBidAdapter.js
+++ b/modules/appnexusBidAdapter.js
@@ -4,8 +4,8 @@ import { config } from '../src/config.js';
 import { registerBidder, getIabSubCategory } from '../src/adapters/bidderFactory.js';
 import { BANNER, NATIVE, VIDEO, ADPOD } from '../src/mediaTypes.js';
 import { auctionManager } from '../src/auctionManager.js';
-import find from 'core-js/library/fn/array/find.js';
-import includes from 'core-js/library/fn/array/includes.js';
+import find from 'core-js-pure/features/array/find';
+import includes from 'core-js-pure/features/array/includes';
 import { OUTSTREAM, INSTREAM } from '../src/video.js';
 
 const BIDDER_CODE = 'appnexus';
diff --git a/modules/audienceNetworkBidAdapter.js b/modules/audienceNetworkBidAdapter.js
index 54a50af4269..da81a386e5f 100644
--- a/modules/audienceNetworkBidAdapter.js
+++ b/modules/audienceNetworkBidAdapter.js
@@ -4,8 +4,8 @@
 import { registerBidder } from '../src/adapters/bidderFactory.js';
 import { formatQS } from '../src/url.js';
 import { generateUUID, deepAccess, convertTypes } from '../src/utils.js';
-import findIndex from 'core-js/library/fn/array/find-index.js';
-import includes from 'core-js/library/fn/array/includes.js';
+import findIndex from 'core-js-pure/features/array/find-index';
+import includes from 'core-js-pure/features/array/includes';
 
 const code = 'audienceNetwork';
 const currency = 'USD';
diff --git a/modules/beachfrontBidAdapter.js b/modules/beachfrontBidAdapter.js
index bbb4ae35729..3d3ac9b51ef 100644
--- a/modules/beachfrontBidAdapter.js
+++ b/modules/beachfrontBidAdapter.js
@@ -4,8 +4,8 @@ import { config } from '../src/config.js';
 import { registerBidder } from '../src/adapters/bidderFactory.js';
 import { Renderer } from '../src/Renderer.js';
 import { VIDEO, BANNER } from '../src/mediaTypes.js';
-import find from 'core-js/library/fn/array/find.js';
-import includes from 'core-js/library/fn/array/includes.js';
+import find from 'core-js-pure/features/array/find';
+import includes from 'core-js-pure/features/array/includes';
 
 const ADAPTER_VERSION = '1.9';
 const ADAPTER_NAME = 'BFIO_PREBID';
diff --git a/modules/bridgewellBidAdapter.js b/modules/bridgewellBidAdapter.js
index a95a19f0402..b4891549115 100644
--- a/modules/bridgewellBidAdapter.js
+++ b/modules/bridgewellBidAdapter.js
@@ -1,7 +1,7 @@
 import * as utils from '../src/utils.js';
 import { registerBidder } from '../src/adapters/bidderFactory.js';
 import { BANNER, NATIVE } from '../src/mediaTypes.js';
-import find from 'core-js/library/fn/array/find.js';
+import find from 'core-js-pure/features/array/find';
 
 const BIDDER_CODE = 'bridgewell';
 const REQUEST_ENDPOINT = 'https://prebid.scupio.com/recweb/prebid.aspx?cb=' + Math.random();
diff --git a/modules/consentManagement.js b/modules/consentManagement.js
index f098effdb08..91869bdbabc 100644
--- a/modules/consentManagement.js
+++ b/modules/consentManagement.js
@@ -7,8 +7,8 @@
 import * as utils from '../src/utils.js';
 import { config } from '../src/config.js';
 import { gdprDataHandler } from '../src/adapterManager.js';
-import includes from 'core-js/library/fn/array/includes.js';
-import strIncludes from 'core-js/library/fn/string/includes.js';
+import includes from 'core-js-pure/features/array/includes';
+import strIncludes from 'core-js-pure/features/string/includes';
 
 const DEFAULT_CMP = 'iab';
 const DEFAULT_CONSENT_TIMEOUT = 10000;
diff --git a/modules/criteoBidAdapter.js b/modules/criteoBidAdapter.js
index b1b1cc75745..eb509583823 100644
--- a/modules/criteoBidAdapter.js
+++ b/modules/criteoBidAdapter.js
@@ -4,7 +4,7 @@ import { config } from '../src/config.js';
 import { BANNER, NATIVE, VIDEO } from '../src/mediaTypes.js';
 import { parse } from '../src/url.js';
 import * as utils from '../src/utils.js';
-import find from 'core-js/library/fn/array/find.js';
+import find from 'core-js-pure/features/array/find';
 import { verify } from 'criteo-direct-rsa-validate/build/verify.js';
 
 export const ADAPTER_VERSION = 26;
diff --git a/modules/emx_digitalBidAdapter.js b/modules/emx_digitalBidAdapter.js
index 22a7bb6f643..2b5a848fd96 100644
--- a/modules/emx_digitalBidAdapter.js
+++ b/modules/emx_digitalBidAdapter.js
@@ -2,7 +2,7 @@ import * as utils from '../src/utils.js';
 import { registerBidder } from '../src/adapters/bidderFactory.js';
 import { BANNER, VIDEO } from '../src/mediaTypes.js';
 import { Renderer } from '../src/Renderer.js';
-import includes from 'core-js/library/fn/array/includes.js';
+import includes from 'core-js-pure/features/array/includes';
 import {parse as parseUrl} from '../src/url.js';
 
 const BIDDER_CODE = 'emx_digital';
diff --git a/modules/gumgumBidAdapter.js b/modules/gumgumBidAdapter.js
index baa79ecfe04..bbc0be5a04d 100644
--- a/modules/gumgumBidAdapter.js
+++ b/modules/gumgumBidAdapter.js
@@ -2,7 +2,7 @@ import * as utils from '../src/utils.js'
 
 import { config } from '../src/config.js'
 import { BANNER, VIDEO } from '../src/mediaTypes.js';
-import includes from 'core-js/library/fn/array/includes.js';
+import includes from 'core-js-pure/features/array/includes';
 import { registerBidder } from '../src/adapters/bidderFactory.js'
 
 const BIDDER_CODE = 'gumgum'
diff --git a/modules/ixBidAdapter.js b/modules/ixBidAdapter.js
index fd22a21b94f..31dc660a1c1 100644
--- a/modules/ixBidAdapter.js
+++ b/modules/ixBidAdapter.js
@@ -1,8 +1,8 @@
 import * as utils from '../src/utils.js';
 import { BANNER, VIDEO } from '../src/mediaTypes.js';
 import { config } from '../src/config.js';
-import find from 'core-js/library/fn/array/find.js';
-import isInteger from 'core-js/library/fn/number/is-integer.js';
+import find from 'core-js-pure/features/array/find';
+import isInteger from 'core-js-pure/features/number/is-integer';
 import { registerBidder } from '../src/adapters/bidderFactory.js';
 
 const BIDDER_CODE = 'ix';
diff --git a/modules/livewrappedBidAdapter.js b/modules/livewrappedBidAdapter.js
index 0e478869b53..75216bab46b 100644
--- a/modules/livewrappedBidAdapter.js
+++ b/modules/livewrappedBidAdapter.js
@@ -1,7 +1,7 @@
 import * as utils from '../src/utils.js';
 import { registerBidder } from '../src/adapters/bidderFactory.js';
 import { config } from '../src/config.js';
-import find from 'core-js/library/fn/array/find.js';
+import find from 'core-js-pure/features/array/find';
 import { BANNER, NATIVE } from '../src/mediaTypes.js';
 
 const BIDDER_CODE = 'livewrapped';
diff --git a/modules/nextrollBidAdapter.js b/modules/nextrollBidAdapter.js
index e85efceba68..5f26822d2ae 100644
--- a/modules/nextrollBidAdapter.js
+++ b/modules/nextrollBidAdapter.js
@@ -3,7 +3,7 @@ import { registerBidder } from '../src/adapters/bidderFactory.js';
 import { BANNER } from '../src/mediaTypes.js';
 import { parse as parseUrl } from '../src/url.js';
 
-import find from 'core-js/library/fn/array/find.js';
+import find from 'core-js-pure/features/array/find';
 
 const BIDDER_CODE = 'nextroll';
 const BIDDER_ENDPOINT = 'https://d.adroll.com/bid/prebid/';
diff --git a/modules/prebidServerBidAdapter/index.js b/modules/prebidServerBidAdapter/index.js
index 3b16330310d..daf3684f19c 100644
--- a/modules/prebidServerBidAdapter/index.js
+++ b/modules/prebidServerBidAdapter/index.js
@@ -8,10 +8,10 @@ import { VIDEO, NATIVE } from '../../src/mediaTypes.js';
 import { processNativeAdUnitParams } from '../../src/native.js';
 import { isValid } from '../../src/adapters/bidderFactory.js';
 import events from '../../src/events.js';
-import includes from 'core-js/library/fn/array/includes.js';
+import includes from 'core-js-pure/features/array/includes';
 import { S2S_VENDORS } from './config.js';
 import { ajax } from '../../src/ajax.js';
-import find from 'core-js/library/fn/array/find.js';
+import find from 'core-js-pure/features/array/find';
 
 const getConfig = config.getConfig;
 
diff --git a/modules/roxotAnalyticsAdapter.js b/modules/roxotAnalyticsAdapter.js
index 814a2c0d1ad..bb5605a77a6 100644
--- a/modules/roxotAnalyticsAdapter.js
+++ b/modules/roxotAnalyticsAdapter.js
@@ -1,7 +1,7 @@
 import adapter from '../src/AnalyticsAdapter.js';
 import CONSTANTS from '../src/constants.json';
 import adapterManager from '../src/adapterManager.js';
-import includes from 'core-js/library/fn/array/includes.js';
+import includes from 'core-js-pure/features/array/includes';
 import {ajaxBuilder} from '../src/ajax.js';
 
 const utils = require('../src/utils.js');
diff --git a/modules/rtbhouseBidAdapter.js b/modules/rtbhouseBidAdapter.js
index b0d7c0e04de..ed9d335b499 100644
--- a/modules/rtbhouseBidAdapter.js
+++ b/modules/rtbhouseBidAdapter.js
@@ -1,7 +1,7 @@
 import * as utils from '../src/utils.js';
 import { BANNER, NATIVE } from '../src/mediaTypes.js';
 import { registerBidder } from '../src/adapters/bidderFactory.js';
-import includes from 'core-js/library/fn/array/includes.js';
+import includes from 'core-js-pure/features/array/includes';
 
 const BIDDER_CODE = 'rtbhouse';
 const REGIONS = ['prebid-eu', 'prebid-us', 'prebid-asia'];
diff --git a/modules/sigmoidAnalyticsAdapter.js b/modules/sigmoidAnalyticsAdapter.js
index c20afbf9bfe..dbd40738176 100644
--- a/modules/sigmoidAnalyticsAdapter.js
+++ b/modules/sigmoidAnalyticsAdapter.js
@@ -1,6 +1,6 @@
 /* Sigmoid Analytics Adapter for prebid.js v1.1.0-pre
 Updated : 2018-03-28 */
-import includes from 'core-js/library/fn/array/includes.js';
+import includes from 'core-js-pure/features/array/includes';
 import adapter from '../src/AnalyticsAdapter.js';
 import CONSTANTS from '../src/constants.json';
 import adapterManager from '../src/adapterManager.js';
diff --git a/modules/sizeMappingV2.js b/modules/sizeMappingV2.js
index ec3604faa97..92d83e99b69 100644
--- a/modules/sizeMappingV2.js
+++ b/modules/sizeMappingV2.js
@@ -6,7 +6,7 @@
 import * as utils from '../src/utils.js';
 import { processNativeAdUnitParams } from '../src/native.js';
 import { adunitCounter } from '../src/adUnits.js';
-import includes from 'core-js/library/fn/array/includes.js';
+import includes from 'core-js-pure/features/array/includes';
 import { getHook } from '../src/hook.js';
 import {
   adUnitSetupChecks
diff --git a/modules/somoBidAdapter.js b/modules/somoBidAdapter.js
index 298b1c3050e..eedcce564a1 100644
--- a/modules/somoBidAdapter.js
+++ b/modules/somoBidAdapter.js
@@ -1,6 +1,6 @@
 import * as utils from '../src/utils.js';
 import { registerBidder } from '../src/adapters/bidderFactory.js';
-import includes from 'core-js/library/fn/array/includes.js';
+import includes from 'core-js-pure/features/array/includes';
 import {BANNER, VIDEO} from '../src/mediaTypes.js';
 
 const VIDEO_TARGETING = ['mimes', 'minduration', 'maxduration', 'protocols',
diff --git a/modules/sovrnAnalyticsAdapter.js b/modules/sovrnAnalyticsAdapter.js
index 8a712680dac..3160e63ca28 100644
--- a/modules/sovrnAnalyticsAdapter.js
+++ b/modules/sovrnAnalyticsAdapter.js
@@ -4,8 +4,8 @@ import CONSTANTS from '../src/constants.json'
 import {ajaxBuilder} from '../src/ajax.js'
 import * as utils from '../src/utils.js'
 import {config} from '../src/config.js'
-import find from 'core-js/library/fn/array/find.js'
-import includes from 'core-js/library/fn/array/includes.js'
+import find from 'core-js-pure/features/array/find'
+import includes from 'core-js-pure/features/array/includes'
 
 const ajax = ajaxBuilder(0)
 
diff --git a/modules/synacormediaBidAdapter.js b/modules/synacormediaBidAdapter.js
index ae2fd91cb6f..d2c81e898bb 100644
--- a/modules/synacormediaBidAdapter.js
+++ b/modules/synacormediaBidAdapter.js
@@ -3,7 +3,7 @@
 import { getAdUnitSizes, logWarn } from '../src/utils.js';
 import { registerBidder } from '../src/adapters/bidderFactory.js';
 import { BANNER, VIDEO } from '../src/mediaTypes.js';
-import includes from 'core-js/library/fn/array/includes.js';
+import includes from 'core-js-pure/features/array/includes';
 
 const BID_HOST = 'https://prebid.technoratimedia.com';
 const USER_SYNC_HOST = 'https://ad-cdn.technoratimedia.com';
diff --git a/modules/userId/index.js b/modules/userId/index.js
index c1f8075863b..2d46f196c8a 100644
--- a/modules/userId/index.js
+++ b/modules/userId/index.js
@@ -96,7 +96,7 @@
  * @property {(function|undefined)} callback - function that will return an id
  */
 
-import find from 'core-js/library/fn/array/find.js';
+import find from 'core-js-pure/features/array/find';
 import {config} from '../../src/config.js';
 import events from '../../src/events.js';
 import * as utils from '../../src/utils.js';
diff --git a/modules/viewdeosDXBidAdapter.js b/modules/viewdeosDXBidAdapter.js
index fb028fca8c8..ee9cd9b7e70 100644
--- a/modules/viewdeosDXBidAdapter.js
+++ b/modules/viewdeosDXBidAdapter.js
@@ -2,7 +2,7 @@ import * as utils from '../src/utils.js';
 import {registerBidder} from '../src/adapters/bidderFactory.js';
 import {VIDEO, BANNER} from '../src/mediaTypes.js';
 import {Renderer} from '../src/Renderer.js';
-import findIndex from 'core-js/library/fn/array/find-index.js';
+import findIndex from 'core-js-pure/features/array/find-index';
 
 const URL = 'https://ghb.sync.viewdeos.com/auction/';
 const OUTSTREAM_SRC = 'https://player.sync.viewdeos.com/outstream-unit/2.01/outstream.min.js';
diff --git a/modules/widespaceBidAdapter.js b/modules/widespaceBidAdapter.js
index 486926f1889..ee58161876f 100644
--- a/modules/widespaceBidAdapter.js
+++ b/modules/widespaceBidAdapter.js
@@ -5,8 +5,8 @@ import {
   parseQueryStringParameters,
   parseSizesInput
 } from '../src/utils.js';
-import includes from 'core-js/library/fn/array/includes.js';
-import find from 'core-js/library/fn/array/find.js';
+import includes from 'core-js-pure/features/array/includes';
+import find from 'core-js-pure/features/array/find';
 
 const BIDDER_CODE = 'widespace';
 const WS_ADAPTER_VERSION = '2.0.1';
diff --git a/modules/xhbBidAdapter.js b/modules/xhbBidAdapter.js
index 0f7669f6eeb..3d8949fd430 100644
--- a/modules/xhbBidAdapter.js
+++ b/modules/xhbBidAdapter.js
@@ -2,8 +2,8 @@ import { Renderer } from '../src/Renderer.js';
 import * as utils from '../src/utils.js';
 import { registerBidder } from '../src/adapters/bidderFactory.js';
 import { BANNER, NATIVE, VIDEO } from '../src/mediaTypes.js';
-import find from 'core-js/library/fn/array/find.js';
-import includes from 'core-js/library/fn/array/includes.js';
+import find from 'core-js-pure/features/array/find';
+import includes from 'core-js-pure/features/array/includes';
 
 const BIDDER_CODE = 'xhb';
 const URL = 'https://ib.adnxs.com/ut/v3/prebid';
diff --git a/modules/yieldlabBidAdapter.js b/modules/yieldlabBidAdapter.js
index ca07449f12e..ff43462cad4 100644
--- a/modules/yieldlabBidAdapter.js
+++ b/modules/yieldlabBidAdapter.js
@@ -1,6 +1,6 @@
 import * as utils from '../src/utils.js'
 import { registerBidder } from '../src/adapters/bidderFactory.js'
-import find from 'core-js/library/fn/array/find.js'
+import find from 'core-js-pure/features/array/find'
 import { VIDEO, BANNER } from '../src/mediaTypes.js'
 import { Renderer } from '../src/Renderer.js'
 
diff --git a/package.json b/package.json
index 071ebe71c6c..d48edf90050 100755
--- a/package.json
+++ b/package.json
@@ -96,7 +96,7 @@
   },
   "dependencies": {
     "babel-plugin-transform-object-assign": "^6.22.0",
-    "core-js": "^2.4.1",
+    "core-js": "^3.0.0",
     "criteo-direct-rsa-validate": "^1.1.0",
     "crypto-js": "^3.3.0",
     "deep-equal": "^1.0.1",
@@ -105,6 +105,7 @@
     "express": "^4.15.4",
     "fun-hooks": "^0.9.8",
     "jsencrypt": "^3.0.0-rc.1",
-    "just-clone": "^1.0.2"
+    "just-clone": "^1.0.2",
+    "core-js-pure": "^3.6.4"
   }
 }
diff --git a/src/Renderer.js b/src/Renderer.js
index 2efe717eca4..a47f37db816 100644
--- a/src/Renderer.js
+++ b/src/Renderer.js
@@ -1,6 +1,6 @@
 import { loadExternalScript } from './adloader.js';
 import * as utils from './utils.js';
-import find from 'core-js/library/fn/array/find.js';
+import find from 'core-js-pure/features/array/find';
 const moduleCode = 'outstream';
 
 /**
diff --git a/src/adapterManager.js b/src/adapterManager.js
index 9886934ab47..fbf9ec2992f 100644
--- a/src/adapterManager.js
+++ b/src/adapterManager.js
@@ -7,8 +7,8 @@ import { newBidder } from './adapters/bidderFactory.js';
 import { ajaxBuilder } from './ajax.js';
 import { config, RANDOM } from './config.js';
 import { hook } from './hook.js';
-import includes from 'core-js/library/fn/array/includes.js';
-import find from 'core-js/library/fn/array/find.js';
+import includes from 'core-js-pure/features/array/includes';
+import find from 'core-js-pure/features/array/find';
 import { adunitCounter } from './adUnits.js';
 import { getRefererInfo } from './refererDetection.js';
 
diff --git a/src/adapters/bidderFactory.js b/src/adapters/bidderFactory.js
index 64bfe27c0c5..cb64d0cd6bb 100644
--- a/src/adapters/bidderFactory.js
+++ b/src/adapters/bidderFactory.js
@@ -7,7 +7,7 @@ import { nativeBidIsValid } from '../native.js';
 import { isValidVideoBid } from '../video.js';
 import CONSTANTS from '../constants.json';
 import events from '../events.js';
-import includes from 'core-js/library/fn/array/includes.js';
+import includes from 'core-js-pure/features/array/includes';
 import { ajax } from '../ajax.js';
 import { logWarn, logError, parseQueryStringParameters, delayExecution, parseSizesInput, getBidderRequest, flatten, uniques, timestamp, setDataInLocalStorage, getDataFromLocalStorage, deepAccess, isArray } from '../utils.js';
 import { ADPOD } from '../mediaTypes.js';
diff --git a/src/adloader.js b/src/adloader.js
index ce21d763797..2bc594a503a 100644
--- a/src/adloader.js
+++ b/src/adloader.js
@@ -1,4 +1,4 @@
-import includes from 'core-js/library/fn/array/includes.js';
+import includes from 'core-js-pure/features/array/includes';
 import * as utils from './utils.js';
 
 const _requestCache = {};
diff --git a/src/auction.js b/src/auction.js
index 628c164a537..6698dff78c6 100644
--- a/src/auction.js
+++ b/src/auction.js
@@ -66,7 +66,7 @@ import { Renderer } from './Renderer.js';
 import { config } from './config.js';
 import { userSync } from './userSync.js';
 import { hook } from './hook.js';
-import find from 'core-js/library/fn/array/find.js';
+import find from 'core-js-pure/features/array/find';
 import { OUTSTREAM } from './video.js';
 import { VIDEO } from './mediaTypes.js';
 
diff --git a/src/auctionManager.js b/src/auctionManager.js
index bf95f0ab05e..602e69cbd5c 100644
--- a/src/auctionManager.js
+++ b/src/auctionManager.js
@@ -18,7 +18,7 @@
 
 import { uniques, flatten, logWarn } from './utils.js';
 import { newAuction, getStandardBidderSettings, AUCTION_COMPLETED } from './auction.js';
-import find from 'core-js/library/fn/array/find.js';
+import find from 'core-js-pure/features/array/find';
 
 const CONSTANTS = require('./constants.json');
 
diff --git a/src/config.js b/src/config.js
index 678b680d712..472aebe5577 100644
--- a/src/config.js
+++ b/src/config.js
@@ -13,12 +13,12 @@
  */
 
 import { isValidPriceConfig } from './cpmBucketManager.js';
-import find from 'core-js/library/fn/array/find.js';
-import includes from 'core-js/library/fn/array/includes.js';
-import Set from 'core-js/library/fn/set.js';
+import find from 'core-js-pure/features/array/find';
+import includes from 'core-js-pure/features/array/includes';
+import Set from 'core-js-pure/features/set';
 import { parseQS } from './url.js';
 
-const from = require('core-js/library/fn/array/from.js');
+const from = require('core-js-pure/features/array/from');
 const utils = require('./utils.js');
 const CONSTANTS = require('./constants.json');
 
diff --git a/src/cpmBucketManager.js b/src/cpmBucketManager.js
index 2f0ae4312e9..ef60b32666e 100644
--- a/src/cpmBucketManager.js
+++ b/src/cpmBucketManager.js
@@ -1,4 +1,4 @@
-import find from 'core-js/library/fn/array/find.js';
+import find from 'core-js-pure/features/array/find';
 const utils = require('./utils.js');
 
 const _defaultPrecision = 2;
diff --git a/src/native.js b/src/native.js
index 0d8461a5b6f..6ff0c227adc 100644
--- a/src/native.js
+++ b/src/native.js
@@ -1,5 +1,5 @@
 import { deepAccess, getBidRequest, getKeyByValue, insertHtmlIntoIframe, logError, triggerPixel } from './utils.js';
-import includes from 'core-js/library/fn/array/includes.js';
+import includes from 'core-js-pure/features/array/includes';
 
 const CONSTANTS = require('./constants.json');
 
diff --git a/src/prebid.js b/src/prebid.js
index aa2d2493e7b..5adfbc8108c 100644
--- a/src/prebid.js
+++ b/src/prebid.js
@@ -9,7 +9,7 @@ import { auctionManager } from './auctionManager.js';
 import { targeting } from './targeting.js';
 import { hook } from './hook.js';
 import { sessionLoader } from './debugging.js';
-import includes from 'core-js/library/fn/array/includes.js';
+import includes from 'core-js-pure/features/array/includes';
 import { adunitCounter } from './adUnits.js';
 import { isRendererRequired, executeRenderer } from './Renderer.js';
 import { createBid } from './bidfactory.js';
diff --git a/src/secureCreatives.js b/src/secureCreatives.js
index 36e5efe22cd..37030584094 100644
--- a/src/secureCreatives.js
+++ b/src/secureCreatives.js
@@ -8,9 +8,9 @@ import { fireNativeTrackers, getAssetMessage } from './native.js';
 import { EVENTS } from './constants.json';
 import { logWarn, replaceAuctionPrice } from './utils.js';
 import { auctionManager } from './auctionManager.js';
-import find from 'core-js/library/fn/array/find.js';
+import find from 'core-js-pure/features/array/find';
 import { isRendererRequired, executeRenderer } from './Renderer.js';
-import includes from 'core-js/library/fn/array/includes.js';
+import includes from 'core-js-pure/features/array/includes';
 
 const BID_WON = EVENTS.BID_WON;
 
diff --git a/src/sizeMapping.js b/src/sizeMapping.js
index ff54ff8f251..c3cc5889fec 100644
--- a/src/sizeMapping.js
+++ b/src/sizeMapping.js
@@ -1,6 +1,6 @@
 import { config } from './config.js';
 import {logWarn, isPlainObject, deepAccess, deepClone, getWindowTop} from './utils.js';
-import includes from 'core-js/library/fn/array/includes.js';
+import includes from 'core-js-pure/features/array/includes';
 
 let sizeConfig = [];
 
diff --git a/src/targeting.js b/src/targeting.js
index d960d800a25..6bef633f722 100644
--- a/src/targeting.js
+++ b/src/targeting.js
@@ -4,7 +4,7 @@ import { NATIVE_TARGETING_KEYS } from './native.js';
 import { auctionManager } from './auctionManager.js';
 import { sizeSupported } from './sizeMapping.js';
 import { ADPOD } from './mediaTypes.js';
-import includes from 'core-js/library/fn/array/includes.js';
+import includes from 'core-js-pure/features/array/includes';
 
 const utils = require('./utils.js');
 var CONSTANTS = require('./constants.json');
diff --git a/src/userSync.js b/src/userSync.js
index e19f64d8082..07b3a6f7e48 100644
--- a/src/userSync.js
+++ b/src/userSync.js
@@ -1,6 +1,6 @@
 import * as utils from './utils.js';
 import { config } from './config.js';
-import includes from 'core-js/library/fn/array/includes.js';
+import includes from 'core-js-pure/features/array/includes';
 
 export const USERSYNC_DEFAULT_CONFIG = {
   syncEnabled: true,
diff --git a/src/utils.js b/src/utils.js
index 3211048b5a8..bd7219ba369 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -1,8 +1,8 @@
 /* eslint-disable no-console */
 import { config } from './config.js';
 import clone from 'just-clone';
-import find from 'core-js/library/fn/array/find.js';
-import includes from 'core-js/library/fn/array/includes.js';
+import find from 'core-js-pure/features/array/find';
+import includes from 'core-js-pure/features/array/includes';
 
 const CONSTANTS = require('./constants.json');
 
diff --git a/src/video.js b/src/video.js
index c3deb73ad4d..233fc76438a 100644
--- a/src/video.js
+++ b/src/video.js
@@ -1,7 +1,7 @@
 import adapterManager from './adapterManager.js';
 import { getBidRequest, deepAccess, logError } from './utils.js';
 import { config } from '../src/config.js';
-import includes from 'core-js/library/fn/array/includes.js';
+import includes from 'core-js-pure/features/array/includes';
 import { hook } from './hook.js';
 
 const VIDEO_MEDIA_TYPE = 'video';
diff --git a/test/spec/auctionmanager_spec.js b/test/spec/auctionmanager_spec.js
index 3ec3d67e448..dacdc6abc6e 100644
--- a/test/spec/auctionmanager_spec.js
+++ b/test/spec/auctionmanager_spec.js
@@ -1,13 +1,18 @@
-import { getKeyValueTargetingPairs, auctionCallbacks, AUCTION_COMPLETED } from 'src/auction.js';
+import {
+  getKeyValueTargetingPairs,
+  auctionCallbacks,
+  AUCTION_COMPLETED,
+  adjustBids,
+  getMediaTypeGranularity,
+} from 'src/auction.js';
 import CONSTANTS from 'src/constants.json';
-import { adjustBids, getMediaTypeGranularity } from 'src/auction.js';
 import * as auctionModule from 'src/auction.js';
 import { registerBidder } from 'src/adapters/bidderFactory.js';
 import { createBid } from 'src/bidfactory.js';
 import { config } from 'src/config.js';
 import * as store from 'src/videoCache.js';
 import * as ajaxLib from 'src/ajax.js';
-import find from 'core-js/library/fn/array/find.js';
+import find from 'core-js-pure/features/array/find';
 import { server } from 'test/mocks/xhr.js';
 
 var assert = require('assert');
diff --git a/test/spec/e2e/longform/basic_w_bidderSettings.spec.js b/test/spec/e2e/longform/basic_w_bidderSettings.spec.js
index 06413fb809a..379caafa5b8 100644
--- a/test/spec/e2e/longform/basic_w_bidderSettings.spec.js
+++ b/test/spec/e2e/longform/basic_w_bidderSettings.spec.js
@@ -1,4 +1,4 @@
-const includes = require('core-js/library/fn/array/includes');
+const includes = require('core-js-pure/features/array/includes');
 const expect = require('chai').expect;
 const testServer = require('../../../helpers/testing-utils');
 
diff --git a/test/spec/e2e/longform/basic_w_custom_adserver_translation.spec.js b/test/spec/e2e/longform/basic_w_custom_adserver_translation.spec.js
index 82310738246..8a22668fb65 100644
--- a/test/spec/e2e/longform/basic_w_custom_adserver_translation.spec.js
+++ b/test/spec/e2e/longform/basic_w_custom_adserver_translation.spec.js
@@ -1,4 +1,4 @@
-const includes = require('core-js/library/fn/array/includes');
+const includes = require('core-js-pure/features/array/includes');
 const expect = require('chai').expect;
 const testServer = require('../../../helpers/testing-utils');
 
diff --git a/test/spec/e2e/longform/basic_w_priceGran.spec.js b/test/spec/e2e/longform/basic_w_priceGran.spec.js
index 696b7fa3359..a4725aad638 100644
--- a/test/spec/e2e/longform/basic_w_priceGran.spec.js
+++ b/test/spec/e2e/longform/basic_w_priceGran.spec.js
@@ -1,4 +1,4 @@
-const includes = require('core-js/library/fn/array/includes');
+const includes = require('core-js-pure/features/array/includes');
 const expect = require('chai').expect;
 const testServer = require('../../../helpers/testing-utils');
 
diff --git a/test/spec/e2e/longform/basic_w_requireExactDuration.spec.js b/test/spec/e2e/longform/basic_w_requireExactDuration.spec.js
index 224ff1cbc34..938fe33830d 100644
--- a/test/spec/e2e/longform/basic_w_requireExactDuration.spec.js
+++ b/test/spec/e2e/longform/basic_w_requireExactDuration.spec.js
@@ -1,4 +1,4 @@
-const includes = require('core-js/library/fn/array/includes');
+const includes = require('core-js-pure/features/array/includes');
 const expect = require('chai').expect;
 const testServer = require('../../../helpers/testing-utils');
 
diff --git a/test/spec/e2e/longform/basic_wo_brandCategoryExclusion.spec.js b/test/spec/e2e/longform/basic_wo_brandCategoryExclusion.spec.js
index 95237366d0e..83e2e6630b6 100644
--- a/test/spec/e2e/longform/basic_wo_brandCategoryExclusion.spec.js
+++ b/test/spec/e2e/longform/basic_wo_brandCategoryExclusion.spec.js
@@ -1,4 +1,4 @@
-const includes = require('core-js/library/fn/array/includes');
+const includes = require('core-js-pure/features/array/includes');
 const expect = require('chai').expect;
 const testServer = require('../../../helpers/testing-utils');
 
diff --git a/test/spec/e2e/longform/basic_wo_requireExactDuration.spec.js b/test/spec/e2e/longform/basic_wo_requireExactDuration.spec.js
index 6b628067138..d301be2787b 100644
--- a/test/spec/e2e/longform/basic_wo_requireExactDuration.spec.js
+++ b/test/spec/e2e/longform/basic_wo_requireExactDuration.spec.js
@@ -1,4 +1,4 @@
-const includes = require('core-js/library/fn/array/includes');
+const includes = require('core-js-pure/features/array/includes');
 const expect = require('chai').expect;
 const testServer = require('../../../helpers/testing-utils');
 
diff --git a/test/spec/modules/eplanningAnalyticsAdapter_spec.js b/test/spec/modules/eplanningAnalyticsAdapter_spec.js
index e900f7ca31c..645dab8eaab 100644
--- a/test/spec/modules/eplanningAnalyticsAdapter_spec.js
+++ b/test/spec/modules/eplanningAnalyticsAdapter_spec.js
@@ -1,5 +1,5 @@
 import eplAnalyticsAdapter from 'modules/eplanningAnalyticsAdapter.js';
-import includes from 'core-js/library/fn/array/includes.js';
+import includes from 'core-js-pure/features/array/includes';
 import { expect } from 'chai';
 import {parse as parseURL} from 'src/url.js';
 import { server } from 'test/mocks/xhr.js';
diff --git a/test/spec/modules/fintezaAnalyticsAdapter_spec.js b/test/spec/modules/fintezaAnalyticsAdapter_spec.js
index 4b58761d8a6..987ac92bce6 100644
--- a/test/spec/modules/fintezaAnalyticsAdapter_spec.js
+++ b/test/spec/modules/fintezaAnalyticsAdapter_spec.js
@@ -1,5 +1,5 @@
 import fntzAnalyticsAdapter from 'modules/fintezaAnalyticsAdapter.js';
-import includes from 'core-js/library/fn/array/includes.js';
+import includes from 'core-js-pure/features/array/includes';
 import { expect } from 'chai';
 import { parse as parseURL } from 'src/url.js';
 import { server } from 'test/mocks/xhr.js';
diff --git a/test/spec/modules/rubiconBidAdapter_spec.js b/test/spec/modules/rubiconBidAdapter_spec.js
index 7adedbcfdde..ad409d650ad 100644
--- a/test/spec/modules/rubiconBidAdapter_spec.js
+++ b/test/spec/modules/rubiconBidAdapter_spec.js
@@ -2,13 +2,9 @@ import {expect} from 'chai';
 import adapterManager from 'src/adapterManager.js';
 import {spec, getPriceGranularity, masSizeOrdering, resetUserSync, hasVideoMediaType, FASTLANE_ENDPOINT} from 'modules/rubiconBidAdapter.js';
 import {parse as parseQuery} from 'querystring';
-import {newBidder} from 'src/adapters/bidderFactory.js';
-import {userSync} from 'src/userSync.js';
 import {config} from 'src/config.js';
 import * as utils from 'src/utils.js';
-import find from 'core-js/library/fn/array/find.js';
-
-var CONSTANTS = require('src/constants.json');
+import find from 'core-js-pure/features/array/find';
 
 const INTEGRATION = `pbjs_lite_v$prebid.version$`; // $prebid.version$ will be substituted in by gulp in built prebid
 
diff --git a/test/spec/modules/widespaceBidAdapter_spec.js b/test/spec/modules/widespaceBidAdapter_spec.js
index c7d4f3bdaf9..9cca52fdbb7 100644
--- a/test/spec/modules/widespaceBidAdapter_spec.js
+++ b/test/spec/modules/widespaceBidAdapter_spec.js
@@ -1,6 +1,6 @@
 import {expect} from 'chai';
 import {spec} from 'modules/widespaceBidAdapter.js';
-import includes from 'core-js/library/fn/array/includes.js';
+import includes from 'core-js-pure/features/array/includes';
 
 describe('+widespaceAdatperTest', function () {
   // Dummy bid request
diff --git a/test/spec/sizeMapping_spec.js b/test/spec/sizeMapping_spec.js
index b6b8c00ada3..fb728d74279 100644
--- a/test/spec/sizeMapping_spec.js
+++ b/test/spec/sizeMapping_spec.js
@@ -1,6 +1,6 @@
 import { expect } from 'chai';
 import { resolveStatus, setSizeConfig, sizeSupported } from 'src/sizeMapping.js';
-import includes from 'core-js/library/fn/array/includes.js';
+import includes from 'core-js-pure/features/array/includes';
 
 let utils = require('src/utils');
 let deepClone = utils.deepClone;
diff --git a/test/spec/unit/core/adapterManager_spec.js b/test/spec/unit/core/adapterManager_spec.js
index 566ebe2e400..61f5fd60630 100644
--- a/test/spec/unit/core/adapterManager_spec.js
+++ b/test/spec/unit/core/adapterManager_spec.js
@@ -11,8 +11,8 @@ import * as utils from 'src/utils.js';
 import { config } from 'src/config.js';
 import { registerBidder } from 'src/adapters/bidderFactory.js';
 import { setSizeConfig } from 'src/sizeMapping.js';
-import find from 'core-js/library/fn/array/find.js';
-import includes from 'core-js/library/fn/array/includes.js';
+import find from 'core-js-pure/features/array/find';
+import includes from 'core-js-pure/features/array/includes';
 import s2sTesting from 'modules/s2sTesting.js';
 var events = require('../../../../src/events');
 
diff --git a/test/spec/unit/pbjs_api_spec.js b/test/spec/unit/pbjs_api_spec.js
index cfdd39239d3..d977d3153f7 100644
--- a/test/spec/unit/pbjs_api_spec.js
+++ b/test/spec/unit/pbjs_api_spec.js
@@ -13,22 +13,16 @@ import { targeting, newTargeting, filters } from 'src/targeting.js';
 import { config as configObj } from 'src/config.js';
 import * as ajaxLib from 'src/ajax.js';
 import * as auctionModule from 'src/auction.js';
-import { newBidder, registerBidder } from 'src/adapters/bidderFactory.js';
+import { registerBidder } from 'src/adapters/bidderFactory.js';
 import { _sendAdToCreative } from 'src/secureCreatives.js';
-import find from 'core-js/library/fn/array/find.js';
+import find from 'core-js-pure/features/array/find';
 
 var assert = require('chai').assert;
 var expect = require('chai').expect;
 
-var urlParse = require('url-parse');
-
-var prebid = require('src/prebid');
 var utils = require('src/utils');
-var bidfactory = require('src/bidfactory');
-var adloader = require('test/mocks/adloaderStub');
 var adapterManager = require('src/adapterManager').default;
 var events = require('src/events');
-var adserver = require('src/adserver');
 var CONSTANTS = require('src/constants.json');
 
 // These bid adapters are required to be loaded for the following tests to work