diff --git a/src/Curl/Curl.php b/src/Curl/Curl.php
index 0ae256a..1f3a76f 100644
--- a/src/Curl/Curl.php
+++ b/src/Curl/Curl.php
@@ -4,7 +4,7 @@ namespace Curl;
 
 class Curl
 {
-    const VERSION = '4.6.7';
+    const VERSION = '4.6.8';
     const DEFAULT_TIMEOUT = 30;
 
     public $curl;
diff --git a/src/Curl/MultiCurl.php b/src/Curl/MultiCurl.php
index e07d43c..806a88f 100644
--- a/src/Curl/MultiCurl.php
+++ b/src/Curl/MultiCurl.php
@@ -310,6 +310,19 @@ class MultiCurl
         $this->setOpt(CURLOPT_USERPWD, $username . ':' . $password);
     }
 
+    /**
+     * Set Digest Authentication
+     *
+     * @access public
+     * @param  $username
+     * @param  $password
+     */
+    public function setDigestAuthentication($username, $password = '')
+    {
+        $this->setOpt(CURLOPT_HTTPAUTH, CURLAUTH_DIGEST);
+        $this->setOpt(CURLOPT_USERPWD, $username . ':' . $password);
+    }
+
     /**
      * Set Cookie
      *
diff --git a/tests/PHPCurlClass/PHPMultiCurlClassTest.php b/tests/PHPCurlClass/PHPMultiCurlClassTest.php
index 352bc44..7fc7b54 100644
--- a/tests/PHPCurlClass/PHPMultiCurlClassTest.php
+++ b/tests/PHPCurlClass/PHPMultiCurlClassTest.php
@@ -1612,6 +1612,82 @@ class MultiCurlTest extends PHPUnit_Framework_TestCase
         $this->assertEquals($password2, $get_2->response->password);
     }
 
+    public function testDigestHttpAuthSuccess()
+    {
+        $username = 'myusername';
+        $password = 'mypassword';
+        $invalid_password = 'anotherpassword';
+
+        // Ensure that http digest returns canceled when not using any http digest authentication.
+        $multi_curl = new MultiCurl();
+        $multi_curl->setHeader('X-DEBUG-TEST', 'http_digest_auth');
+
+        $get_1 = $multi_curl->addGet(Test::TEST_URL);
+        $get_1->complete(function ($instance) {
+            PHPUnit_Framework_Assert::assertEquals('canceled', $instance->response);
+            PHPUnit_Framework_Assert::assertEquals(401, $instance->httpStatusCode);
+        });
+
+        $multi_curl->start();
+
+        // Ensure that http digest returns invalid when using incorrect http digest authentication.
+        $multi_curl = new MultiCurl();
+        $multi_curl->setHeader('X-DEBUG-TEST', 'http_digest_auth');
+        $multi_curl->setDigestAuthentication($username, $invalid_password);
+        $this->assertEquals(CURLAUTH_DIGEST, $multi_curl->getOpt(CURLOPT_HTTPAUTH));
+
+        $get_1 = $multi_curl->addGet(Test::TEST_URL);
+        $get_1->complete(function ($instance) {
+            PHPUnit_Framework_Assert::assertEquals(CURLAUTH_DIGEST, $instance->getOpt(CURLOPT_HTTPAUTH));
+            PHPUnit_Framework_Assert::assertEquals('invalid', $instance->response);
+            PHPUnit_Framework_Assert::assertEquals(401, $instance->httpStatusCode);
+        });
+
+        $multi_curl->start();
+
+        // Ensure that http digest returns valid when using correct http digest authentication.
+        $multi_curl = new MultiCurl();
+        $multi_curl->setHeader('X-DEBUG-TEST', 'http_digest_auth');
+        $multi_curl->setDigestAuthentication($username, $password);
+        $this->assertEquals(CURLAUTH_DIGEST, $multi_curl->getOpt(CURLOPT_HTTPAUTH));
+
+        $get_1 = $multi_curl->addGet(Test::TEST_URL);
+        $get_1->complete(function ($instance) {
+            PHPUnit_Framework_Assert::assertEquals(CURLAUTH_DIGEST, $instance->getOpt(CURLOPT_HTTPAUTH));
+            PHPUnit_Framework_Assert::assertEquals('valid', $instance->response);
+            PHPUnit_Framework_Assert::assertEquals(200, $instance->httpStatusCode);
+        });
+
+        $multi_curl->start();
+
+        // Ensure that http digest can return both invalid and valid when using
+        // incorrect and correct authentication in the same MultiCurl.
+        $multi_curl = new MultiCurl();
+        $multi_curl->setHeader('X-DEBUG-TEST', 'http_digest_auth');
+        $multi_curl->setDigestAuthentication($username, $password);
+        $this->assertEquals(CURLAUTH_DIGEST, $multi_curl->getOpt(CURLOPT_HTTPAUTH));
+
+        $get_1 = $multi_curl->addGet(Test::TEST_URL);
+        $get_1->beforeSend(function ($instance) use ($username, $invalid_password) {
+            $instance->setDigestAuthentication($username, $invalid_password);
+            PHPUnit_Framework_Assert::assertEquals(CURLAUTH_DIGEST, $instance->getOpt(CURLOPT_HTTPAUTH));
+        });
+        $get_1->complete(function ($instance) {
+            PHPUnit_Framework_Assert::assertEquals(CURLAUTH_DIGEST, $instance->getOpt(CURLOPT_HTTPAUTH));
+            PHPUnit_Framework_Assert::assertEquals('invalid', $instance->response);
+            PHPUnit_Framework_Assert::assertEquals(401, $instance->httpStatusCode);
+        });
+
+        $get_2 = $multi_curl->addGet(Test::TEST_URL);
+        $get_2->complete(function ($instance) {
+            PHPUnit_Framework_Assert::assertEquals(CURLAUTH_DIGEST, $instance->getOpt(CURLOPT_HTTPAUTH));
+            PHPUnit_Framework_Assert::assertEquals('valid', $instance->response);
+            PHPUnit_Framework_Assert::assertEquals(200, $instance->httpStatusCode);
+        });
+
+        $multi_curl->start();
+    }
+
     public function testCookies()
     {
         $data = array('key' => 'mycookie');