diff --git a/src/openlayers/package.json b/src/openlayers/package.json
index ec1c83d107..d4d4586f0a 100644
--- a/src/openlayers/package.json
+++ b/src/openlayers/package.json
@@ -20,7 +20,7 @@
 "@turf/turf": "6.5.0",
 "mapv": "2.0.62",
 "ol": "7.5.2",
- "canvg": "3.0.10",
+ "canvg": "4.0.3",
 "lodash.clonedeep": "^4.5.0",
 "lodash.remove": "^4.7.0",
 "lodash.difference": "^4.5.0",
</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/SuperMap/iClient-JavaScript/pull/507.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/SuperMap/iClient-JavaScript/pull/507.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>