diff --git a/day-4/saga-examples/README.md b/day-4/saga-examples/README.md
index 2af0aa6..2fc6b79 100644
--- a/day-4/saga-examples/README.md
+++ b/day-4/saga-examples/README.md
@@ -132,12 +132,12 @@ thanks @superRaytin (You may check the referenced version of redux-saga)
 
 There is also a **umd** build of `redux-saga` available in the `dist/` folder. When using the umd build `redux-saga` is available as `ReduxSaga` in the window object.
 
-The umd version is useful if you don't use Webpack or Browserify. You can access it directly from [npmcdn](npmcdn.com).
+The umd version is useful if you don't use Webpack or Browserify. You can access it directly from [unpkg](unpkg.com).
 
 The following builds are available:
 
-- [https://npmcdn.com/redux-saga/dist/redux-saga.js](https://npmcdn.com/redux-saga/dist/redux-saga.js)  
-- [https://npmcdn.com/redux-saga/dist/redux-saga.min.js](https://npmcdn.com/redux-saga/dist/redux-saga.min.js)
+- [https://unpkg.com/redux-saga/dist/redux-saga.js](https://unpkg.com/redux-saga/dist/redux-saga.js)  
+- [https://unpkg.com/redux-saga/dist/redux-saga.min.js](https://unpkg.com/redux-saga/dist/redux-saga.min.js)
 
 **Important!** If the browser you are targeting doesn't support *ES2015 generators*, you must provide a valid polyfill, such as [the one provided by `babel`](https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.25/browser-polyfill.min.js). The polyfill must be imported before **redux-saga**:
 
diff --git a/day-4/saga-examples/README_ja.md b/day-4/saga-examples/README_ja.md
index b663ae9..6e02526 100644
--- a/day-4/saga-examples/README_ja.md
+++ b/day-4/saga-examples/README_ja.md
@@ -132,12 +132,12 @@ sagaMiddleware.run(mySaga)
 `dist/` ディレクトリには `redux-saga` の **umd** ビルドもあります。
 umd ビルドを使うときは window オブジェクトに `ReduxSaga` という名前で `redux-saga` が提供されます。
 
-umd バージョンは webpack や browserify を使わない場合には便利です。[npmcdn](npmcdn.com) から直接利用できます。
+umd バージョンは webpack や browserify を使わない場合には便利です。[unpkg](unpkg.com) から直接利用できます。
 
 以下のビルドが利用可能です:
 
-- [https://npmcdn.com/redux-saga/dist/redux-saga.js](https://npmcdn.com/redux-saga/dist/redux-saga.js)  
-- [https://npmcdn.com/redux-saga/dist/redux-saga.min.js](https://npmcdn.com/redux-saga/dist/redux-saga.min.js)
+- [https://unpkg.com/redux-saga/dist/redux-saga.js](https://unpkg.com/redux-saga/dist/redux-saga.js)  
+- [https://unpkg.com/redux-saga/dist/redux-saga.min.js](https://unpkg.com/redux-saga/dist/redux-saga.min.js)
 
 **重要!** ターゲットのブラウザが *ES2015 の Generator* をサポートしていない場合、[*babel*](https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.25/browser-polyfill.min.js) のような有効な polyfill
 を提供しなければなりません。
diff --git a/day-4/saga-examples/README_zh-cn.md b/day-4/saga-examples/README_zh-cn.md
index bf8a7ad..3aff0b6 100644
--- a/day-4/saga-examples/README_zh-cn.md
+++ b/day-4/saga-examples/README_zh-cn.md
@@ -702,9 +702,9 @@ npm start
 
 #Using umd build in the browser
 
-在`dist/`目录，`redux-saga`有一个可用的 **umd** 构建。使用umd构建，`redux-saga` 可以作为`ReduxSaga`在window对象中使用。如果你不使用webpack或者browserify，umd版本非常有用，你可以通过[npmcdn](npmcdn.com)直接使用。
+在`dist/`目录，`redux-saga`有一个可用的 **umd** 构建。使用umd构建，`redux-saga` 可以作为`ReduxSaga`在window对象中使用。如果你不使用webpack或者browserify，umd版本非常有用，你可以通过[unpkg](unpkg.com)直接使用。
 下面是可用的构建:
-[https://npmcdn.com/redux-saga/dist/redux-saga.js](https://npmcdn.com/redux-saga/dist/redux-saga.js)
-[https://npmcdn.com/redux-saga/dist/redux-saga.min.js](https://npmcdn.com/redux-saga/dist/redux-saga.min.js)
+[https://unpkg.com/redux-saga/dist/redux-saga.js](https://unpkg.com/redux-saga/dist/redux-saga.js)
+[https://unpkg.com/redux-saga/dist/redux-saga.min.js](https://unpkg.com/redux-saga/dist/redux-saga.min.js)
 
 **重要提示!** 如果目标浏览器不支持 _es2015 generators_ 你必须使用好的转换库，如 *babel*: [browser-polyfill.min.js](https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.25/browser-polyfill.min.js). 这个库必须在 **redux-saga** 前被加载.
diff --git a/day-4/saga-examples/README_zh-hant.md b/day-4/saga-examples/README_zh-hant.md
index 9a0e95f..dacc745 100644
--- a/day-4/saga-examples/README_zh-hant.md
+++ b/day-4/saga-examples/README_zh-hant.md
@@ -685,9 +685,9 @@ npm start
 
 #在瀏覽器使用 umd 組建
 
-`redux-saga` 有 **umd** 組建位於 `dist/` 目錄之下。使用 `redux-saga` 的 umd 組建可以從 window 物件下的 `ReduxSaga` 取得。當你沒有使用 webpack 或 browserify 時，umd 版本是非常有用的，你可以直接從 [npmcdn](npmcdn.com) 取得。包含下列組建：
+`redux-saga` 有 **umd** 組建位於 `dist/` 目錄之下。使用 `redux-saga` 的 umd 組建可以從 window 物件下的 `ReduxSaga` 取得。當你沒有使用 webpack 或 browserify 時，umd 版本是非常有用的，你可以直接從 [unpkg](unpkg.com) 取得。包含下列組建：
 
-- [https://npmcdn.com/redux-saga/dist/redux-saga.js](https://npmcdn.com/redux-saga/dist/redux-saga.js)  
-- [https://npmcdn.com/redux-saga/dist/redux-saga.min.js](https://npmcdn.com/redux-saga/dist/redux-saga.min.js)
+- [https://unpkg.com/redux-saga/dist/redux-saga.js](https://unpkg.com/redux-saga/dist/redux-saga.js)  
+- [https://unpkg.com/redux-saga/dist/redux-saga.min.js](https://unpkg.com/redux-saga/dist/redux-saga.min.js)
 
 **重要！** 如果你的目標瀏覽器不支援 _es2015 generators_，你需要提供合適的 polyfill，例如，*babel* 所提供的：[browser-polyfill.min.js](https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.25/browser-polyfill.min.js)。這個 polyfill 必須在 **redux-saga** 之前載入。
diff --git a/day-4/saga-examples/examples/counter-vanilla/index.html b/day-4/saga-examples/examples/counter-vanilla/index.html
index 7d8437c..fdb8dcf 100644
--- a/day-4/saga-examples/examples/counter-vanilla/index.html
+++ b/day-4/saga-examples/examples/counter-vanilla/index.html
@@ -2,7 +2,7 @@
 <html>
   <head>
     <title>Redux basic example</title>
-    <script src="https://npmcdn.com/redux@latest/dist/redux.min.js"></script>
+    <script src="https://unpkg.com/redux@latest/dist/redux.min.js"></script>
       <script src="../../dist/redux-saga.js"></script>
   </head>
   <body>