diff --git a/lib/chrome.js b/lib/chrome.js
index ccf6159..be30858 100644
--- a/lib/chrome.js
+++ b/lib/chrome.js
@@ -53,7 +53,6 @@ var ChromeObject = function() {
     // for remote debugging
     this.debuggingPort = 0;
     this.pageId = "";
-    this.ws = Websocket.create();
     this.isAttached = false;
     this.pageList = [];
     this.title = "";
@@ -1498,7 +1497,7 @@ exports.startDebugInPrivate = function(url, proxy, profileName, debuggingPort, i
 
 exports.publisherName = publisherName;
 
-exports.VERSIONINFO = "Chrome Web Browser Debugging Interface (chrome.js) version 0.5.4";
+exports.VERSIONINFO = "Chrome Web Browser Debugging Interface (chrome.js) version 0.5.5";
 exports.AUTHOR = "gnh1201@catswords.re.kr";
 exports.global = global;
 exports.require = global.require;