diff --git a/readme-ja.md b/readme-ja.md
deleted file mode 100644
index 0618dd2f..00000000
--- a/readme-ja.md
+++ /dev/null
@@ -1,40 +0,0 @@
-<h1 align="center">
-  <a href="https://github.com/BoostIO/Boostnote"><img src="./resources/app.png" alt="Boostnote" width="180"></a>
-  <br>
-  Boostnote
-  <br>
-  <br>
-</h1>
-<h4 align="center">クールなプログラマーの為の、オープンソースのノートアプリ </h4>
-<h5 align="center">macOS, Windows, Linuxで利用できます。</h5>
-<h5 align="center">Built with Electron, React + Redux, Webpack and CSSModules</h5>
-
-![Boostnote app screenshot](./resources/repository/top.png)
-
-[![Build Status](https://travis-ci.org/BoostIO/Boostnote.svg?branch=master)](https://travis-ci.org/BoostIO/Boostnote)
-
-## Author & Maintainer
-- [Rokt33r](https://github.com/rokt33r)
-- [sota1235](https://github.com/sota1235)
-- [Kohei TAKATA](https://github.com/kohei-takata)
-- [asmsuechan](https://github.com/asmsuechan)
-- [Kazu Yokomizo](https://github.com/kazup01)
-
-## Contributors
-[Great contributors](https://github.com/BoostIO/Boostnote/graphs/contributors) :tada:
-
-## slack group
-私たちにはslack groupもあります！世界中のプログラマー達と、Boostnoteについてディスカッションをしましょう！ <br>
-[こちらから](https://join.slack.com/boostnote-group/shared_invite/MjAwNTAwNzc4MDM0LTE0OTc5NjIzMDItZjcyOWIyOWY5YQ)
-
-## More Information
-* Website: http://boostnote.io/
-* Roadmap(upcoming features and bug fixes): https://github.com/BoostIO/Boostnote/wiki/List-of-the-requested-features
-* Boostnote Shop(Products are shipped to all over the world :+1:): https://boostnote.paintory.com/
-* Donation: [Bountysource](https://salt.bountysource.com/teams/boostnote)
-* Development: https://github.com/BoostIO/Boostnote/blob/master/docs/build.md
-* Copyright (C) 2017 Maisin&Co.
-
-## License
-
-[GPL v3](./LICENSE).
diff --git a/readme.md b/readme.md
index c079a76c..16a8bfae 100644
--- a/readme.md
+++ b/readme.md
@@ -25,7 +25,7 @@
 
 ## Slack Group
 Let's talk about Boostnote's great features, new feature requests and things like Japanese gourmet. 🍣 <br>
-[Join us](https://join.slack.com/boostnote-group/shared_invite/MjAwNTAwNzc4MDM0LTE0OTc5NjIzMDItZjcyOWIyOWY5YQ)
+[Join us](https://join.slack.com/boostnote-group/shared_invite/MjA0Nzc1OTg1MzAyLTE0OTg1Mzc5ODEtMzBlMGZhNzM4MQ)
 
 ## More Information
 * [Website](https://boostnote.io)