diff --git a/composer.json b/composer.json
index ae05b23..4df7bf6 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
 "require-dev": {
 "phpstan/phpstan": "^1.12.9",
 "phpstan/phpstan-phpunit": "^1.4.0",
- "phpstan/phpstan-strict-rules": "^1.6.1",
+ "phpstan/phpstan-strict-rules": "^2.0.0",
 "phpunit/phpunit": "^11.4.3",
 "slam/php-cs-fixer-extensions": "^3.12.0",
 "symfony/console": "^7.1.7"
</div><div class="naked_ctrl">
<form action="/index.cgi/contrast" 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/Slamdunk/php-errorhandler-legacy/pull/46.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/Slamdunk/php-errorhandler-legacy/pull/46.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" selected="selected">配色反転</option>
<option value="larger-text">文字拡大</option>
<option value="mobile">モバイル</option>
</select>
<input type="submit" value="表示" />
</p>
</form>
</div>