diff --git a/README.md b/README.md
index 2628c1e9..3edafbd4 100644
--- a/README.md
+++ b/README.md
@@ -67,7 +67,7 @@ Ensure [requirements](#user-content-requires) are met, then execute the followin
 npx create-react-app@3.x $APP_NAME
 cd $APP_NAME
 heroku create $APP_NAME --buildpack mars/create-react-app
-git push heroku master
+git push heroku main
 heroku open
 ```
 
@@ -104,20 +104,20 @@ This command:
 
 * sets the [app name](https://devcenter.heroku.com/articles/creating-apps#creating-a-named-app) & its default URL `https://$APP_NAME.herokuapp.com`
 * sets the app to use this [buildpack](https://devcenter.heroku.com/articles/buildpacks)
-* configures the [`heroku` git remote](https://devcenter.heroku.com/articles/git#creating-a-heroku-remote) in the local repo, so `git push heroku master` will push to this new Heroku app.
+* configures the [`heroku` git remote](https://devcenter.heroku.com/articles/git#creating-a-heroku-remote) in the local repo, so `git push heroku main` will push to this new Heroku app.
 
 ### Deploy ♻️
 
 ```bash
-git push heroku master
+git push heroku main
 ```
 
-...or if you are ever working on a branch other than `master`:
+...or if you are ever working on a branch other than `main`:
 
 ✏️ *Replace `$BRANCH_NAME` with the name for the current branch.*
 
 ```bash
-git push heroku $BRANCH_NAME:master
+git push heroku $BRANCH_NAME:main
 ```
 
 ### Visit the app's public URL in your browser
@@ -134,7 +134,7 @@ Find the app on [your dashboard](https://dashboard.heroku.com).
 
 Work with your app locally using `npm start`. See: [create-react-app docs](https://github.com/facebookincubator/create-react-app#getting-started)
 
-Then, `git commit` your changes & `git push heroku master` ♻️
+Then, `git commit` your changes & `git push heroku main` ♻️
 
 ### Push to Github
 
@@ -369,7 +369,7 @@ class App extends Component {
 heroku config:set REACT_APP_HELLO='I love sushi!'
 
 git commit --allow-empty -m "Set REACT_APP_HELLO config var"
-git push heroku master
+git push heroku main
 ```
 
 Only `REACT_APP_` vars are replaced in create-react-app's build. To make any other variables visible to React, they must be prefixed for the build command in `package.json`, like this:
@@ -480,7 +480,7 @@ Troubleshooting
 
 ```bash
 git commit --allow-empty -m 'Switch to create-react-app-buildpack'
- git push heroku master
+ git push heroku main
 ```
 
 If the error still occurs, then at least we know it's really using this buildpack! Proceed with troubleshooting.
@@ -495,7 +495,7 @@ Troubleshooting
 Version compatibility
 ---------------------
 
-This buildpack will never intentionally cause previously deployed apps to become undeployable. Using master [as directed in the main instructions](#user-content-create-the-heroku-app) will always deploy an app with the most recent version of this buildpack.
+This buildpack will never intentionally cause previously deployed apps to become undeployable. Using main [as directed in the main instructions](#user-content-create-the-heroku-app) will always deploy an app with the most recent version of this buildpack.
 
 [Releases are tagged](https://github.com/mars/create-react-app-buildpack/releases), so you can lock an app to a specific version, if that kind of determinism pleases you:
 
</div><div class="naked_ctrl">
<form action="/index.cgi/larger-text" method="get" name="gate">
<p><a href="http://altstyle.alfasado.net">AltStyle</a> によって変換されたページ <a href="https://patch-diff.githubusercontent.com/raw/mars/create-react-app-buildpack/pull/193.diff">(-&gt;オリジナル)</a>
/ <label>アドレス: <input type="text" name="naked_post_url" value="https://patch-diff.githubusercontent.com/raw/mars/create-react-app-buildpack/pull/193.diff" size="22" /></label> <label>モード: <select name="naked_post_mode">
<option value="default">デフォルト</option>
<option value="speech">音声ブラウザ</option>
<option value="ruby">ルビ付き</option>
<option value="contrast">配色反転</option>
<option value="larger-text" selected="selected">文字拡大</option>
<option value="mobile">モバイル</option>
</select>
<input type="submit" value="表示" />
</p>
</form>
</div>