diff --git a/packages/@hidoo/express-engine-handlebars/test/fixtures/expected/with-default-helpers.html b/packages/@hidoo/express-engine-handlebars/test/fixtures/expected/with-default-helpers.html
index c4cbab63..8d114535 100644
--- a/packages/@hidoo/express-engine-handlebars/test/fixtures/expected/with-default-helpers.html
+++ b/packages/@hidoo/express-engine-handlebars/test/fixtures/expected/with-default-helpers.html
@@ -15,7 +15,7 @@ <h1 id="heading">heading</h1>
 <li>list 2</li>
 <li>list 3</li>
 </ul>
-<pre><code class="hljs language-js"><span class="hljs-keyword">import</span> hoge <span class="hljs-keyword">from</span> <span class="hljs-string">'hoge'</span>;
+<pre><code class="hljs language-js"><span class="hljs-keyword">import</span> hoge <span class="hljs-keyword">from</span> <span class="hljs-string">&#x27;hoge&#x27;</span>;
 
 hoge();</code></pre>
 
diff --git a/packages/@hidoo/handlebars-helpers/package.json b/packages/@hidoo/handlebars-helpers/package.json
index 834414c1..3bf91cb8 100644
--- a/packages/@hidoo/handlebars-helpers/package.json
+++ b/packages/@hidoo/handlebars-helpers/package.json
@@ -23,7 +23,7 @@
   "author": "hidoo",
   "license": "MIT",
   "dependencies": {
-    "highlight.js": "10.0.3",
+    "highlight.js": "10.4.1",
     "marked": "2.0.1",
     "path-browserify": "1.0.1"
   },
diff --git a/packages/@hidoo/handlebars-helpers/test/highlight.test.js b/packages/@hidoo/handlebars-helpers/test/highlight.test.js
index 9850b3ff..7adf2b2a 100644
--- a/packages/@hidoo/handlebars-helpers/test/highlight.test.js
+++ b/packages/@hidoo/handlebars-helpers/test/highlight.test.js
@@ -37,17 +37,17 @@ describe('{{highlight value lang=\'<lang>\'}}', () => {
       [
         '<div class="hoge"></div>',
         'html',
-        '<span class="hljs-tag">&lt;<span class="hljs-name">div</span> <span class="hljs-attr">class</span>=<span class="hljs-string">"hoge"</span>&gt;</span><span class="hljs-tag">&lt;/<span class="hljs-name">div</span>&gt;</span>'
+        '<span class="hljs-tag">&lt;<span class="hljs-name">div</span> <span class="hljs-attr">class</span>=<span class="hljs-string">&quot;hoge&quot;</span>&gt;</span><span class="hljs-tag">&lt;/<span class="hljs-name">div</span>&gt;</span>'
       ],
       [
         'import lodash from "lodash";',
         'js',
-        '<span class="hljs-keyword">import</span> lodash <span class="hljs-keyword">from</span> <span class="hljs-string">"lodash"</span>;'
+        '<span class="hljs-keyword">import</span> lodash <span class="hljs-keyword">from</span> <span class="hljs-string">&quot;lodash&quot;</span>;'
       ],
       [
         '<div>{{#if @first}}first{{else}}not first{{/if}}</div>',
         'hbs',
-        '<span class="xml"><span class="hljs-tag">&lt;<span class="hljs-name">div</span>&gt;</span></span><span class="hljs-template-tag">{{#<span class="hljs-name"><span class="hljs-builtin-name">if</span></span> @first}}</span><span class="xml">first</span><span class="hljs-template-variable">{{<span class="hljs-builtin-name">else</span>}}</span><span class="xml">not first</span><span class="hljs-template-tag">{{/<span class="hljs-name"><span class="hljs-builtin-name">if</span></span>}}</span><span class="xml"><span class="hljs-tag">&lt;/<span class="hljs-name">div</span>&gt;</span></span>'
+        '<span class="xml"><span class="hljs-tag">&lt;<span class="hljs-name">div</span>&gt;</span></span><span class="hljs-template-tag">{{#<span class="hljs-name"><span class="hljs-builtin-name">if</span></span> @first}}</span><span class="xml">first</span><span class="hljs-template-tag">{{<span class="hljs-keyword">else</span>}}</span><span class="xml">not first</span><span class="hljs-template-tag">{{/<span class="hljs-name"><span class="hljs-builtin-name">if</span></span>}}</span><span class="xml"><span class="hljs-tag">&lt;/<span class="hljs-name">div</span>&gt;</span></span>'
       ]
     ];
 
diff --git a/packages/@hidoo/handlebars-helpers/test/markdown.test.js b/packages/@hidoo/handlebars-helpers/test/markdown.test.js
index 7c2d3ff5..e933116d 100644
--- a/packages/@hidoo/handlebars-helpers/test/markdown.test.js
+++ b/packages/@hidoo/handlebars-helpers/test/markdown.test.js
@@ -69,7 +69,7 @@ describe('{{#markdown}}...{{/markdown}}', () => {
 \`\`\`
 `,
         `<h1 id="heading">heading</h1>
-<pre><code class="hljs language-html"><span class="hljs-tag">&lt;<span class="hljs-name">div</span> <span class="hljs-attr">class</span>=<span class="hljs-string">"hoge"</span>&gt;</span>
+<pre><code class="hljs language-html"><span class="hljs-tag">&lt;<span class="hljs-name">div</span> <span class="hljs-attr">class</span>=<span class="hljs-string">&quot;hoge&quot;</span>&gt;</span>
   huga
 <span class="hljs-tag">&lt;/<span class="hljs-name">div</span>&gt;</span></code></pre>
 `
diff --git a/yarn.lock b/yarn.lock
index 138382f1..55c83dbf 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4577,10 +4577,10 @@ he@1.2.0:
   resolved "https://registry.yarnpkg.com/he/-/he-1.2.0.tgz#84ae65fa7eafb165fddb61566ae14baf05664f0f"
   integrity sha512-F/1DnUGPopORZi0ni+CvrCgHQ5FyEAHRLSApuYWMmrbSwoN2Mn/7k+Gl38gJnR7yyDZk6WLXwiGod1JOWNDKGw==
 
-highlight.js@10.0.3:
-  version "10.0.3"
-  resolved "https://registry.yarnpkg.com/highlight.js/-/highlight.js-10.0.3.tgz#5effcc58420f113f279a0badb8ac50c4be06e63b"
-  integrity sha512-9FG7SSzv9yOY5CGGxfI6NDm7xLYtMOjKtPBxw7Zff3t5UcRcUNTGEeS8lNjhceL34KeetLMoGMFTGoaa83HwyQ==
+highlight.js@10.4.1:
+  version "10.4.1"
+  resolved "https://registry.yarnpkg.com/highlight.js/-/highlight.js-10.4.1.tgz#d48fbcf4a9971c4361b3f95f302747afe19dbad0"
+  integrity sha512-yR5lWvNz7c85OhVAEAeFhVCc/GV4C30Fjzc/rCP0aCWzc1UUOPUk55dK/qdwTZHBvMZo+eZ2jpk62ndX/xMFlg==
 
 hosted-git-info@^2.1.4:
   version "2.8.5"