diff --git a/.all-contributorsrc b/.all-contributorsrc
index b3bc8ae..029369e 100644
--- a/.all-contributorsrc
+++ b/.all-contributorsrc
@@ -22,6 +22,15 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "yhatt",
+      "name": "Yuki Hattori",
+      "avatar_url": "https://avatars1.githubusercontent.com/u/3993388?v=4",
+      "profile": "https://github.com/yhatt",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "contributorsPerLine": 7,
diff --git a/README.md b/README.md
index bb1779f..a5e8aaa 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,7 @@
 # are-you-es5
 
 <!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
-
-[![All Contributors](https://img.shields.io/badge/all_contributors-2-orange.svg?style=flat-square)](#contributors-)
-
+[![All Contributors](https://img.shields.io/badge/all_contributors-3-orange.svg?style=flat-square)](#contributors-)
 <!-- ALL-CONTRIBUTORS-BADGE:END -->
 
 [![](https://img.shields.io/circleci/project/github/obahareth/are-you-es5/master.svg?style=popout)](https://circleci.com/gh/obahareth/are-you-es5)
@@ -116,14 +114,14 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
 <!-- markdownlint-disable -->
 <table>
   <tr>
-    <td align="center"><a href="https://github.com/depoulo"><img src="https://avatars0.githubusercontent.com/u/4457202?v=4" width="100px;" alt=""/><br /><sub><b>Paolo Priotto</b></sub></a><br /><a href="https://github.com/obahareth/are-you-es5/commits?author=depoulo" title="Code">💻</a></td>
     <td align="center"><a href="https://github.com/tooppaaa"><img src="https://avatars2.githubusercontent.com/u/599163?v=4" width="100px;" alt=""/><br /><sub><b>Clément DUNGLER</b></sub></a><br /><a href="https://github.com/obahareth/are-you-es5/commits?author=tooppaaa" title="Code">💻</a></td>
+    <td align="center"><a href="https://github.com/depoulo"><img src="https://avatars0.githubusercontent.com/u/4457202?v=4" width="100px;" alt=""/><br /><sub><b>Paolo Priotto</b></sub></a><br /><a href="https://github.com/obahareth/are-you-es5/commits?author=depoulo" title="Code">💻</a></td>
+    <td align="center"><a href="https://github.com/yhatt"><img src="https://avatars1.githubusercontent.com/u/3993388?v=4" width="100px;" alt=""/><br /><sub><b>Yuki Hattori</b></sub></a><br /><a href="https://github.com/obahareth/are-you-es5/commits?author=yhatt" title="Code">💻</a></td>
   </tr>
 </table>
 
 <!-- markdownlint-enable -->
 <!-- prettier-ignore-end -->
-
 <!-- ALL-CONTRIBUTORS-LIST:END -->
 
 This project follows the [all-contributors](https://github.com/all-contributors/all-contributors) specification. Contributions of any kind welcome!