diff --git a/guessthenumber/index.html b/guessthenumber/index.html
index 7e3de34..3cb25a5 100644
--- a/guessthenumber/index.html
+++ b/guessthenumber/index.html
@@ -3,11 +3,11 @@
   <head>
     <title>Guess the Number!</title>
     <link href="http://netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css" rel="stylesheet">
-    <script src="https://npmcdn.com/core-js/client/shim.min.js"></script>
-    <script src="https://npmcdn.com/reflect-metadata@0.1.3"></script>
-    <script src="https://npmcdn.com/zone.js@0.6.12"></script>
-    <script src="https://npmcdn.com/typescript@1.8.10/lib/typescript.js"></script>
-    <script src="https://npmcdn.com/systemjs@0.19.27/dist/system.js"></script>
+    <script src="https://unpkg.com/core-js/client/shim.min.js"></script>
+    <script src="https://unpkg.com/reflect-metadata@0.1.3"></script>
+    <script src="https://unpkg.com/zone.js@0.6.12"></script>
+    <script src="https://unpkg.com/typescript@1.8.10/lib/typescript.js"></script>
+    <script src="https://unpkg.com/systemjs@0.19.27/dist/system.js"></script>
     <script src="systemjs.config.js"></script>
     <script>
       System.import('app').catch(function(err){ console.error(err); });
diff --git a/guessthenumber/systemjs.config.js b/guessthenumber/systemjs.config.js
index 7243cdd..c276623 100644
--- a/guessthenumber/systemjs.config.js
+++ b/guessthenumber/systemjs.config.js
@@ -1,12 +1,12 @@
 System.config({
     map : {
         'app': 'app',
-        'rxjs': 'https://npmcdn.com/rxjs@5.0.0-beta.6',
-        '@angular/common': 'https://npmcdn.com/@angular/common@2.0.0-rc.4',
-        '@angular/compiler': 'https://npmcdn.com/@angular/compiler@2.0.0-rc.4',
-        '@angular/core': 'https://npmcdn.com/@angular/core@2.0.0-rc.4',
-        '@angular/platform-browser': 'https://npmcdn.com/@angular/platform-browser@2.0.0-rc.4',
-        '@angular/platform-browser-dynamic': 'https://npmcdn.com/@angular/platform-browser-dynamic@2.0.0-rc.4'
+        'rxjs': 'https://unpkg.com/rxjs@5.0.0-beta.6',
+        '@angular/common': 'https://unpkg.com/@angular/common@2.0.0-rc.4',
+        '@angular/compiler': 'https://unpkg.com/@angular/compiler@2.0.0-rc.4',
+        '@angular/core': 'https://unpkg.com/@angular/core@2.0.0-rc.4',
+        '@angular/platform-browser': 'https://unpkg.com/@angular/platform-browser@2.0.0-rc.4',
+        '@angular/platform-browser-dynamic': 'https://unpkg.com/@angular/platform-browser-dynamic@2.0.0-rc.4'
     },
     packages:{
         'app':  { main: 'main.ts',  defaultExtension: 'ts' },
