diff --git a/bower.json b/bower.json
index 6de674e..6f2008a 100644
--- a/bower.json
+++ b/bower.json
@@ -1,6 +1,6 @@
 {
   "name": "aurelia-metadata",
-  "version": "1.0.0-beta.1.1.4",
+  "version": "1.0.0-beta.1.1.5",
   "description": "Utilities for reading and writing the metadata of JavaScript functions.",
   "keywords": [
     "aurelia",
diff --git a/dist/amd/aurelia-metadata.d.ts b/dist/amd/aurelia-metadata.d.ts
index 7117f8f..ff625b2 100644
--- a/dist/amd/aurelia-metadata.d.ts
+++ b/dist/amd/aurelia-metadata.d.ts
@@ -1,5 +1,4 @@
 declare module 'aurelia-metadata' {
-  import 'core-js';
   import { PLATFORM }  from 'aurelia-pal';
   
   /**
diff --git a/dist/amd/aurelia-metadata.js b/dist/amd/aurelia-metadata.js
index cdbb75c..9c763f0 100644
--- a/dist/amd/aurelia-metadata.js
+++ b/dist/amd/aurelia-metadata.js
@@ -1,4 +1,4 @@
-define(['exports', 'core-js', 'aurelia-pal'], function (exports, _coreJs, _aureliaPal) {
+define(['exports', 'aurelia-pal'], function (exports, _aureliaPal) {
   'use strict';
 
   exports.__esModule = true;
@@ -12,36 +12,6 @@ define(['exports', 'core-js', 'aurelia-pal'], function (exports, _coreJs, _aurel
 
   function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError('Cannot call a class as a function'); } }
 
-  var theGlobal = _aureliaPal.PLATFORM.global;
-  var emptyMetadata = Object.freeze({});
-  var metadataContainerKey = '__metadata__';
-
-  if (typeof theGlobal.Reflect === 'undefined') {
-    theGlobal.Reflect = {};
-  }
-
-  if (typeof theGlobal.Reflect.getOwnMetadata === 'undefined') {
-    Reflect.getOwnMetadata = function (metadataKey, target, targetKey) {
-      return ((target[metadataContainerKey] || emptyMetadata)[targetKey] || emptyMetadata)[metadataKey];
-    };
-  }
-
-  if (typeof theGlobal.Reflect.defineMetadata === 'undefined') {
-    Reflect.defineMetadata = function (metadataKey, metadataValue, target, targetKey) {
-      var metadataContainer = target.hasOwnProperty(metadataContainerKey) ? target[metadataContainerKey] : target[metadataContainerKey] = {};
-      var targetContainer = metadataContainer[targetKey] || (metadataContainer[targetKey] = {});
-      targetContainer[metadataKey] = metadataValue;
-    };
-  }
-
-  if (typeof theGlobal.Reflect.metadata === 'undefined') {
-    Reflect.metadata = function (metadataKey, metadataValue) {
-      return function (target, targetKey) {
-        Reflect.defineMetadata(metadataKey, metadataValue, target, targetKey);
-      };
-    };
-  }
-
   var metadata = {
     resource: 'aurelia:resource',
     paramTypes: 'design:paramtypes',
diff --git a/dist/aurelia-metadata.d.ts b/dist/aurelia-metadata.d.ts
index 7117f8f..ff625b2 100644
--- a/dist/aurelia-metadata.d.ts
+++ b/dist/aurelia-metadata.d.ts
@@ -1,5 +1,4 @@
 declare module 'aurelia-metadata' {
-  import 'core-js';
   import { PLATFORM }  from 'aurelia-pal';
   
   /**
diff --git a/dist/aurelia-metadata.js b/dist/aurelia-metadata.js
index b94f502..0fefb72 100644
--- a/dist/aurelia-metadata.js
+++ b/dist/aurelia-metadata.js
@@ -1,36 +1,5 @@
-import 'core-js';
 import {PLATFORM} from 'aurelia-pal';
 
-const theGlobal = PLATFORM.global;
-const emptyMetadata = Object.freeze({});
-const metadataContainerKey = '__metadata__';
-
-if (typeof theGlobal.Reflect === 'undefined') {
-  theGlobal.Reflect = {};
-}
-
-if (typeof theGlobal.Reflect.getOwnMetadata === 'undefined') {
-  Reflect.getOwnMetadata = function(metadataKey, target, targetKey) {
-    return ((target[metadataContainerKey] || emptyMetadata)[targetKey] || emptyMetadata)[metadataKey];
-  };
-}
-
-if (typeof theGlobal.Reflect.defineMetadata === 'undefined') {
-  Reflect.defineMetadata = function(metadataKey, metadataValue, target, targetKey) {
-    let metadataContainer = target.hasOwnProperty(metadataContainerKey) ? target[metadataContainerKey] : (target[metadataContainerKey] = {});
-    let targetContainer = metadataContainer[targetKey] || (metadataContainer[targetKey] = {});
-    targetContainer[metadataKey] = metadataValue;
-  };
-}
-
-if (typeof theGlobal.Reflect.metadata === 'undefined') {
-  Reflect.metadata = function(metadataKey, metadataValue) {
-    return function(target, targetKey) {
-      Reflect.defineMetadata(metadataKey, metadataValue, target, targetKey);
-    };
-  };
-}
-
 /**
 * Helpers for working with metadata on functions.
 */
diff --git a/dist/commonjs/aurelia-metadata.d.ts b/dist/commonjs/aurelia-metadata.d.ts
index 7117f8f..ff625b2 100644
--- a/dist/commonjs/aurelia-metadata.d.ts
+++ b/dist/commonjs/aurelia-metadata.d.ts
@@ -1,5 +1,4 @@
 declare module 'aurelia-metadata' {
-  import 'core-js';
   import { PLATFORM }  from 'aurelia-pal';
   
   /**
diff --git a/dist/commonjs/aurelia-metadata.js b/dist/commonjs/aurelia-metadata.js
index 4b9f790..b26ceab 100644
--- a/dist/commonjs/aurelia-metadata.js
+++ b/dist/commonjs/aurelia-metadata.js
@@ -11,40 +11,8 @@ exports.protocol = protocol;
 
 function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError('Cannot call a class as a function'); } }
 
-require('core-js');
-
 var _aureliaPal = require('aurelia-pal');
 
-var theGlobal = _aureliaPal.PLATFORM.global;
-var emptyMetadata = Object.freeze({});
-var metadataContainerKey = '__metadata__';
-
-if (typeof theGlobal.Reflect === 'undefined') {
-  theGlobal.Reflect = {};
-}
-
-if (typeof theGlobal.Reflect.getOwnMetadata === 'undefined') {
-  Reflect.getOwnMetadata = function (metadataKey, target, targetKey) {
-    return ((target[metadataContainerKey] || emptyMetadata)[targetKey] || emptyMetadata)[metadataKey];
-  };
-}
-
-if (typeof theGlobal.Reflect.defineMetadata === 'undefined') {
-  Reflect.defineMetadata = function (metadataKey, metadataValue, target, targetKey) {
-    var metadataContainer = target.hasOwnProperty(metadataContainerKey) ? target[metadataContainerKey] : target[metadataContainerKey] = {};
-    var targetContainer = metadataContainer[targetKey] || (metadataContainer[targetKey] = {});
-    targetContainer[metadataKey] = metadataValue;
-  };
-}
-
-if (typeof theGlobal.Reflect.metadata === 'undefined') {
-  Reflect.metadata = function (metadataKey, metadataValue) {
-    return function (target, targetKey) {
-      Reflect.defineMetadata(metadataKey, metadataValue, target, targetKey);
-    };
-  };
-}
-
 var metadata = {
   resource: 'aurelia:resource',
   paramTypes: 'design:paramtypes',
diff --git a/dist/es6/aurelia-metadata.d.ts b/dist/es6/aurelia-metadata.d.ts
index 7117f8f..ff625b2 100644
--- a/dist/es6/aurelia-metadata.d.ts
+++ b/dist/es6/aurelia-metadata.d.ts
@@ -1,5 +1,4 @@
 declare module 'aurelia-metadata' {
-  import 'core-js';
   import { PLATFORM }  from 'aurelia-pal';
   
   /**
diff --git a/dist/es6/aurelia-metadata.js b/dist/es6/aurelia-metadata.js
index b94f502..0fefb72 100644
--- a/dist/es6/aurelia-metadata.js
+++ b/dist/es6/aurelia-metadata.js
@@ -1,36 +1,5 @@
-import 'core-js';
 import {PLATFORM} from 'aurelia-pal';
 
-const theGlobal = PLATFORM.global;
-const emptyMetadata = Object.freeze({});
-const metadataContainerKey = '__metadata__';
-
-if (typeof theGlobal.Reflect === 'undefined') {
-  theGlobal.Reflect = {};
-}
-
-if (typeof theGlobal.Reflect.getOwnMetadata === 'undefined') {
-  Reflect.getOwnMetadata = function(metadataKey, target, targetKey) {
-    return ((target[metadataContainerKey] || emptyMetadata)[targetKey] || emptyMetadata)[metadataKey];
-  };
-}
-
-if (typeof theGlobal.Reflect.defineMetadata === 'undefined') {
-  Reflect.defineMetadata = function(metadataKey, metadataValue, target, targetKey) {
-    let metadataContainer = target.hasOwnProperty(metadataContainerKey) ? target[metadataContainerKey] : (target[metadataContainerKey] = {});
-    let targetContainer = metadataContainer[targetKey] || (metadataContainer[targetKey] = {});
-    targetContainer[metadataKey] = metadataValue;
-  };
-}
-
-if (typeof theGlobal.Reflect.metadata === 'undefined') {
-  Reflect.metadata = function(metadataKey, metadataValue) {
-    return function(target, targetKey) {
-      Reflect.defineMetadata(metadataKey, metadataValue, target, targetKey);
-    };
-  };
-}
-
 /**
 * Helpers for working with metadata on functions.
 */
diff --git a/dist/system/aurelia-metadata.d.ts b/dist/system/aurelia-metadata.d.ts
index 7117f8f..ff625b2 100644
--- a/dist/system/aurelia-metadata.d.ts
+++ b/dist/system/aurelia-metadata.d.ts
@@ -1,5 +1,4 @@
 declare module 'aurelia-metadata' {
-  import 'core-js';
   import { PLATFORM }  from 'aurelia-pal';
   
   /**
diff --git a/dist/system/aurelia-metadata.js b/dist/system/aurelia-metadata.js
index 983170c..2127dbc 100644
--- a/dist/system/aurelia-metadata.js
+++ b/dist/system/aurelia-metadata.js
@@ -1,7 +1,7 @@
-System.register(['core-js', 'aurelia-pal'], function (_export) {
+System.register(['aurelia-pal'], function (_export) {
   'use strict';
 
-  var PLATFORM, theGlobal, emptyMetadata, metadataContainerKey, metadata, originStorage, unknownOrigin, Origin;
+  var PLATFORM, metadata, originStorage, unknownOrigin, Origin;
 
   var _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };
 
@@ -178,40 +178,10 @@ System.register(['core-js', 'aurelia-pal'], function (_export) {
   }
 
   return {
-    setters: [function (_coreJs) {}, function (_aureliaPal) {
+    setters: [function (_aureliaPal) {
       PLATFORM = _aureliaPal.PLATFORM;
     }],
     execute: function () {
-      theGlobal = PLATFORM.global;
-      emptyMetadata = Object.freeze({});
-      metadataContainerKey = '__metadata__';
-
-      if (typeof theGlobal.Reflect === 'undefined') {
-        theGlobal.Reflect = {};
-      }
-
-      if (typeof theGlobal.Reflect.getOwnMetadata === 'undefined') {
-        Reflect.getOwnMetadata = function (metadataKey, target, targetKey) {
-          return ((target[metadataContainerKey] || emptyMetadata)[targetKey] || emptyMetadata)[metadataKey];
-        };
-      }
-
-      if (typeof theGlobal.Reflect.defineMetadata === 'undefined') {
-        Reflect.defineMetadata = function (metadataKey, metadataValue, target, targetKey) {
-          var metadataContainer = target.hasOwnProperty(metadataContainerKey) ? target[metadataContainerKey] : target[metadataContainerKey] = {};
-          var targetContainer = metadataContainer[targetKey] || (metadataContainer[targetKey] = {});
-          targetContainer[metadataKey] = metadataValue;
-        };
-      }
-
-      if (typeof theGlobal.Reflect.metadata === 'undefined') {
-        Reflect.metadata = function (metadataKey, metadataValue) {
-          return function (target, targetKey) {
-            Reflect.defineMetadata(metadataKey, metadataValue, target, targetKey);
-          };
-        };
-      }
-
       metadata = {
         resource: 'aurelia:resource',
         paramTypes: 'design:paramtypes',
diff --git a/doc/CHANGELOG.md b/doc/CHANGELOG.md
index 57ea94d..3004072 100644
--- a/doc/CHANGELOG.md
+++ b/doc/CHANGELOG.md
@@ -1,3 +1,16 @@
+### 1.0.0-beta.1.1.5 (2016-03-01)
+
+
+#### Bug Fixes
+
+* **all:** remove core-js dependency ([3a300a87](https://github.com/aurelia/metadata/commit/3a300a87126ccf1ab2656c3a09a983a72316d9c9))
+
+
+#### Features
+
+* **all:** remove duplicate code and use new polyfills ([ec2b65ee](https://github.com/aurelia/metadata/commit/ec2b65ee17db5e24b050fca3ea1e088f8ca7aff7))
+
+
 ### 1.0.0-beta.1.1.4 (2016-02-08)
 
 
diff --git a/package.json b/package.json
index fcc3b35..a5cd253 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "aurelia-metadata",
-  "version": "1.0.0-beta.1.1.4",
+  "version": "1.0.0-beta.1.1.5",
   "description": "Utilities for reading and writing the metadata of JavaScript functions.",
   "keywords": [
     "aurelia",