diff --git a/setup.cfg b/setup.cfg
index 5364762f..35f98033 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -19,6 +19,7 @@ classifier =
 Programming Language :: Python :: 3
 Programming Language :: Python :: 3.6
 Programming Language :: Python :: 3.7
+ Programming Language :: Python :: 3.8
 
 [files]
 packages =
diff --git a/tox.ini b/tox.ini
index c6ad63d4..cf91b348 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 minversion = 3.1.1
-envlist = py37,pep8
+envlist = py38,pep8
 skipsdist = True
 ignore_basepython_conflict = True
 
</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://opendev.org/openstack/networking-bgpvpn/commit/f96c22986b36bd443b93968ab21ee9efa2d76c93.diff">(-&gt;オリジナル)</a>
/ <label>アドレス: <input type="text" name="naked_post_url" value="https://opendev.org/openstack/networking-bgpvpn/commit/f96c22986b36bd443b93968ab21ee9efa2d76c93.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>