diff --git a/Pest.php b/Pest.php
index 7cb9d86..94d9a74 100644
--- a/Pest.php
+++ b/Pest.php
@@ -84,6 +84,23 @@ public function setupAuth($user, $pass, $auth = 'basic')
         $this->curl_opts[CURLOPT_HTTPAUTH] = constant('CURLAUTH_' . strtoupper($auth));
         $this->curl_opts[CURLOPT_USERPWD] = $user . ":" . $pass;
     }
+    
+    /**
+     * Setup client certificate
+     * 
+     * @param string $certificateFile
+     * @param string $privateKeyFile
+     * @param string $privateKeyPassword Optional
+     */
+    public function setupClientCertificate($certificateFile, $privateKeyFile, $privateKeyPassword = null)
+    {
+        $this->curl_opts[CURLOPT_SSLCERT] = $certificateFile;
+        $this->curl_opts[CURLOPT_SSLKEY] = $privateKeyFile;      
+        if(is_string($privateKeyPassword) && strlen($privateKeyPassword) > 0)
+        {
+            $this->curl_opts[CURLOPT_SSLKEYPASSWD] = $privateKeyPassword;
+        }
+    }
 
     /**
      * Set cookies for this session