diff --git a/pom.xml b/pom.xml
index 025755c..06dee35 100644
--- a/pom.xml
+++ b/pom.xml
@@ -113,7 +113,7 @@
 <easyrule.version>4.0.0</easyrule.version>
 <websocket.version>2.0.5.RELEASE</websocket.version>
 <fastjson.version>1.2.72</fastjson.version>
- <protobuf-java.version>3.13.0</protobuf-java.version>
+ <protobuf-java.version>3.16.3</protobuf-java.version>
 <grpc.version>1.33.1</grpc.version>
 <ul class="image_map">1.3.0.Final</mapstruct.version>
 <leshan-server.version>1.3.1</leshan-server.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://github.com/IoT-Technology/IoT-Technical-Guide/compare/master...dependabot/maven/com.google.protobuf-protobuf-java-3.16.3.diff">(-&gt;オリジナル)</a>
/ <label>アドレス: <input type="text" name="naked_post_url" value="https://github.com/IoT-Technology/IoT-Technical-Guide/compare/master...dependabot/maven/com.google.protobuf-protobuf-java-3.16.3.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>