diff --git a/changelog.md b/changelog.md
index 20d4c76..ebacc7d 100644
--- a/changelog.md
+++ b/changelog.md
@@ -35,12 +35,20 @@ Edition: ORIZIN Agent HTML
 
 ## リリース
 
-### [v5.0.142.9dev-Eagle] - 2021-03-07
+### [v5.0.142.9dev-Eagle] - 2021-03-08
 
 #### 変更
 
 - HTMLファイルに直書きとなっていたCSSとJavaScriptを別ファイルに切り出しました　[#93](https://github.com/Robot-Inventor/ORIZIN-Agent-HTML/issues/93)
 
+#### セキュリティー
+
+- プロトタイプ汚染脆弱性を修正しました　[#96](https://github.com/Robot-Inventor/ORIZIN-Agent-HTML/issues/96)
+
+#### 修正
+
+- リファクタリングを行いました
+
 ### [v5.0.141.8-Eagle] - 2021-03-07
 
 #### 追加
diff --git a/resource/information.txt b/resource/information.txt
index d175ad2..c5b1ebf 100644
--- a/resource/information.txt
+++ b/resource/information.txt
@@ -2,4 +2,4 @@ Series Name:ORIZIN Agent
 Edition:ORIZIN Agent HTML
 Version:v5.0.142.9dev
 Code Name:Eagle
-Date:2021-03-07 JST
+Date:2021-03-08 JST
diff --git a/resource/javascript/index.js b/resource/javascript/index.js
index 8de8584..3dccf51 100644
--- a/resource/javascript/index.js
+++ b/resource/javascript/index.js
@@ -59,7 +59,7 @@ function add_chat(content, is_user = false, is_youtube = false) {
 }
 
 function chat_and_speak(chat_content, speak_content = "") {
-    if (arguments[1] === undefined) {
+    if (speak_content === undefined) {
         speak_content = chat_content;
     }
     add_chat(chat_content);
@@ -132,7 +132,7 @@ async function read_setting() {
 }
 
 function listening_status(status = false) {
-    if (arguments[0] !== undefined) {
+    if (status !== undefined) {
         if (status) {
             document.getElementById("listening_message").style.opacity = 1;
             document.getElementById("start_recognition").classList.add("listening");
diff --git a/resource/javascript/timer.js b/resource/javascript/timer.js
index 06b9b00..719f6b9 100644
--- a/resource/javascript/timer.js
+++ b/resource/javascript/timer.js
@@ -24,16 +24,16 @@ function update_time(time) {
 
 function timer_status() {
     if (is_stopped) {
-        return "stopped"
+        return "stopped";
     } else {
-        return "started"
+        return "started";
     }
 }
 
 function reset_status() {
     const result = is_reseted;
     is_reseted = false;
-    return result
+    return result;
 }
 
 function set_time() {
@@ -41,11 +41,19 @@ function set_time() {
 }
 
 window.addEventListener("load", () => {
-    let settings = new Object;
+    let settings = {};
+    settings.h = 0;
+    settings.m = 0;
+    settings.s = 0;
+
     const pair = location.search.substring(1).split("&");
     for (var i = 0; pair[i]; i++) {
-        var kv = pair[i].split("=");
-        settings[kv[0]] = kv[1];
+        const kv = pair[i].split("=");
+
+        const name = kv[0];
+        const value = settings.hasOwnProperty(name) ? kv[1] : null;
+
+        settings[name] = value;
     }
     hour = settings.h;
     minute = settings.m;