diff --git a/requirements.txt b/requirements.txt
index 04b5af1..ef8058f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -21,7 +21,7 @@ lesscpy==0.14.0
 MarkupSafe==1.1.1
 mypy-extensions==0.4.3
 numpy==1.19.2
-packaging==20.4
+packaging==20.7
 pandas==1.1.4
 pathlib==1.0.1
 pathspec==0.8.0
</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/toddbirchard/plotlydash-flask-tutorial/pull/68.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/toddbirchard/plotlydash-flask-tutorial/pull/68.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>