diff --git a/Dockerfile b/Dockerfile
index 0ae52858..cf5e268a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Stage 1: Install Python dependencies
-FROM python:3.13.5-slim@sha256:4c2cf9917bd1cbacc5e9b07320025bdb7cdf2df7b0ceaccb55e9dd7e30987419 AS python-builder
+FROM python:3.13.7-slim@sha256:1bca0202e953784ac2a1daf36ebbc9cbebed48afcfba12d1225aaab3793eca33 AS python-builder
 
 WORKDIR /build
 
@@ -16,7 +16,7 @@ RUN set -eux; \
 pip install --no-cache-dir --timeout 1000 .[server,mcp]
 
 # Stage 2: Runtime image
-FROM python:3.13.5-slim@sha256:4c2cf9917bd1cbacc5e9b07320025bdb7cdf2df7b0ceaccb55e9dd7e30987419
+FROM python:3.13.7-slim@sha256:1bca0202e953784ac2a1daf36ebbc9cbebed48afcfba12d1225aaab3793eca33
 
 ARG UID=1000
 ARG GID=1000
</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/coderamp-labs/gitingest/pull/500.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/coderamp-labs/gitingest/pull/500.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>