diff --git a/README.md b/README.md
index 9ca8ffc..6166a8f 100644
--- a/README.md
+++ b/README.md
@@ -78,9 +78,10 @@ To use a proxy for local testing -
 * proxyPort: Port for the proxy, defaults to 3128 when -proxyHost is used
 * proxyUser: Username for connecting to proxy (Basic Auth Only)
 * proxyPass: Password for USERNAME, will be ignored if USERNAME is empty or not specified
+* useCaCertificate: Path to ca cert file, if required
 
 ```js
-bs_local_args = { 'key': '<browserstack-accesskey>', 'proxyHost': '127.0.0.1', 'proxyPort': '8000', 'proxyUser': 'user', 'proxyPass': 'password' }
+bs_local_args = { 'key': '<browserstack-accesskey>', 'proxyHost': '127.0.0.1', 'proxyPort': '8000', 'proxyUser': 'user', 'proxyPass': 'password', 'useCaCertificate': '/Users/test/cert.pem' }
 ```
 
 #### Local Proxy
diff --git a/lib/Local.js b/lib/Local.js
index fd58429..9d8d086 100644
--- a/lib/Local.js
+++ b/lib/Local.js
@@ -183,6 +183,11 @@ function Local(){
         }
         break;
 
+      case 'useCaCertificate':
+        if(value)
+          this.useCaCertificate = value;
+        break;
+
       case 'proxyHost':
         if(value)
           this.proxyHost = value;
@@ -245,6 +250,9 @@ function Local(){
         conf.proxyHost = this.proxyHost;
         conf.proxyPort = this.proxyPort;
       }
+      if (this.useCaCertificate) {
+        conf.useCaCertificate = this.useCaCertificate;
+      }
       if(!callback) {
         return this.binary.binaryPath(conf);
       }
@@ -284,6 +292,10 @@ function Local(){
     }
     if(this.onlyAutomateFlag)
       args.push(this.onlyAutomateFlag);
+    if (this.useCaCertificate) {
+      args.push('--use-ca-certificate');
+      args.push(this.useCaCertificate);
+    }
     if(this.proxyHost){
       args.push('--proxy-host');
       args.push(this.proxyHost);
diff --git a/lib/LocalBinary.js b/lib/LocalBinary.js
index a019979..9f7f672 100644
--- a/lib/LocalBinary.js
+++ b/lib/LocalBinary.js
@@ -73,6 +73,11 @@ function LocalBinary(){
     opts = [path.join(__dirname, 'download.js'), binaryPath, this.httpPath];
     if(conf.proxyHost && conf.proxyPort) {
       opts.push(conf.proxyHost, conf.proxyPort);
+      if (conf.useCaCertificate) {
+        opts.push(conf.useCaCertificate);
+      }
+    } else if (conf.useCaCertificate) {
+      opts.push(undefined, undefined, conf.useCaCertificate);
     }
 
     try{
@@ -113,6 +118,13 @@ function LocalBinary(){
         port: conf.proxyPort
       });
     }
+    if (conf.useCaCertificate) {
+      try {
+        options.ca = fs.readFileSync(conf.useCaCertificate);
+      } catch(err) {
+        console.log("failed to read cert file", err)
+      }
+    }
 
     https.get(options, function (response) {
       response.pipe(fileStream);
diff --git a/lib/download.js b/lib/download.js
index 14b9179..34f93a8 100644
--- a/lib/download.js
+++ b/lib/download.js
@@ -3,7 +3,7 @@ const https = require('https'),
   HttpsProxyAgent = require('https-proxy-agent'),
   url = require('url');
 
-const binaryPath = process.argv[2],httpPath = process.argv[3], proxyHost = process.argv[4], proxyPort = process.argv[5];
+const binaryPath = process.argv[2], httpPath = process.argv[3], proxyHost = process.argv[4], proxyPort = process.argv[5], useCaCertificate = process.argv[6];
 
 var fileStream = fs.createWriteStream(binaryPath);
 
@@ -13,6 +13,13 @@ if(proxyHost && proxyPort) {
     host: proxyHost,
     port: proxyPort
   });
+  if (useCaCertificate) {
+    try {
+      options.ca = fs.readFileSync(useCaCertificate);
+    } catch(err) {
+      console.log("failed to read cert file", err)
+    }
+  }
 }
 
 https.get(options, function (response) {