diff --git a/springboot-learning-examples/springboot-demo/pom.xml b/springboot-learning-examples/springboot-demo/pom.xml
index f89a9ee..3850f26 100644
--- a/springboot-learning-examples/springboot-demo/pom.xml
+++ b/springboot-learning-examples/springboot-demo/pom.xml
@@ -38,7 +38,7 @@
 		<maven-source-plugin>2.1</maven-source-plugin>
 
 <maven.deploy.plugin.version>2.8.2</maven.deploy.plugin.version>
- <spring-boot-version>1.5.9.RELEASE</spring-boot-version>
+ <spring-boot-version>2.5.12</spring-boot-version>
 
 
 <lombok.version>1.16.8</lombok.version>
</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/Admol/Java-learning-examples/pull/12.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/Admol/Java-learning-examples/pull/12.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>