diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index 785faa4b..b6600f70 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -5,7 +5,7 @@ jobs:
 strategy:
 matrix:
 os: [ubuntu-latest, windows-latest, macos-latest]
- node: [10.13, 12, 14]
+ node: [10.13, 12, 14, 15]
 runs-on: ${{ matrix.os }}
 steps:
 - name: ⬇️ Checkout repo
diff --git a/README.md b/README.md
index cd554558..f3638afb 100644
--- a/README.md
+++ b/README.md
@@ -41,7 +41,7 @@
 ## System Requirements
 
 - [git][git] v2.13 or greater
-- [NodeJS][node] `^10.13 || 12 || 14`
+- [NodeJS][node] `^10.13 || 12 || 14 || 15`
 - [npm][npm] v6 or greater
 
 All of these must be available in your `PATH`. To verify things are set up
diff --git a/package.json b/package.json
index 8e80ada2..7e097ae5 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,7 @@
 "license": "GPL-3.0-only",
 "main": "src/index.js",
 "engines": {
- "node": "^10.13 || 12 || 14",
+ "node": "^10.13 || 12 || 14 || 15",
 "npm": ">=6"
 },
 "dependencies": {
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<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/epicweb-dev/advanced-react-apis/pull/101.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/epicweb-dev/advanced-react-apis/pull/101.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>
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