diff --git a/README.md b/README.md
index feac402..de8f563 100644
--- a/README.md
+++ b/README.md
@@ -216,7 +216,7 @@ CONTRIBUTORS
 
 LICENSE
 ---------------------------------------
-Licensed under the [MIT](http://twada.mit-license.org/2014-2016) license.
+Licensed under the [MIT](https://twada.mit-license.org/2014-2016) license.
 
 
 [npm-url]: https://www.npmjs.com/package/licensify
@@ -228,5 +228,5 @@ Licensed under the [MIT](http://twada.mit-license.org/2014-2016) license.
 [depstat-url]: https://gemnasium.com/twada/licensify
 [depstat-image]: https://gemnasium.com/twada/licensify.svg
 
-[license-url]: http://twada.mit-license.org/2014-2016
+[license-url]: https://twada.mit-license.org/2014-2016
 [license-image]: https://img.shields.io/badge/license-MIT-brightgreen.svg
diff --git a/index.js b/index.js
index b306da3..4019fb1 100644
--- a/index.js
+++ b/index.js
@@ -6,6 +6,6 @@
  *
  * Copyright (c) 2014-2016 Takuto Wada
  * Licensed under the MIT license.
- *   http://twada.mit-license.org/2014-2016
+ *   https://twada.mit-license.org/2014-2016
  */
 module.exports = require('./lib/licensify');
diff --git a/lib/licensify.js b/lib/licensify.js
index 5102672..81f03bc 100644
--- a/lib/licensify.js
+++ b/lib/licensify.js
@@ -6,7 +6,7 @@
  *
  * Copyright (c) 2014-2016 Takuto Wada
  * Licensed under the MIT license.
- *   http://twada.mit-license.org/2014-2016
+ *   https://twada.mit-license.org/2014-2016
  */
 'use strict';