diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index 21868c18..331f7956 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -23,7 +23,7 @@ jobs:
 uses: styfle/cancel-workflow-action@0.9.0
 
 - name: ⬇️ Checkout repo
- uses: actions/checkout@v2
+ uses: actions/checkout@v2.3.4
 
 - name: ⎔ Setup node
 uses: actions/setup-node@v2
@@ -55,7 +55,7 @@ jobs:
 uses: styfle/cancel-workflow-action@0.9.0
 
 - name: ⬇️ Checkout repo
- uses: actions/checkout@v2
+ uses: actions/checkout@v2.3.4
 
 - name: ⎔ Setup node
 uses: actions/setup-node@v2
</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/testing-library/react-hooks-testing-library/pull/619.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/testing-library/react-hooks-testing-library/pull/619.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>