diff --git a/composer.lock b/composer.lock
index 0640416f..055117ce 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "content-hash": "fe4302679c1523cf63192337d8f4a61f",
+    "content-hash": "25bac256233b0471e7cc3b8922e61b61",
     "packages": [
         {
             "name": "gregwar/captcha",
@@ -56,28 +56,43 @@
         },
         {
             "name": "phpmailer/phpmailer",
-            "version": "v5.2.14",
+            "version": "v5.2.23",
             "source": {
                 "type": "git",
                 "url": "https://github.com/PHPMailer/PHPMailer.git",
-                "reference": "e774bc9152de85547336e22b8926189e582ece95"
+                "reference": "7115df4a6f76281109ebe352900c42403b728bb4"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/PHPMailer/PHPMailer/zipball/e774bc9152de85547336e22b8926189e582ece95",
-                "reference": "e774bc9152de85547336e22b8926189e582ece95",
+                "url": "https://api.github.com/repos/PHPMailer/PHPMailer/zipball/7115df4a6f76281109ebe352900c42403b728bb4",
+                "reference": "7115df4a6f76281109ebe352900c42403b728bb4",
                 "shasum": ""
             },
             "require": {
                 "php": ">=5.0.0"
             },
             "require-dev": {
-                "phpdocumentor/phpdocumentor": "*",
-                "phpunit/phpunit": "4.7.*"
+                "doctrine/annotations": "1.2.*",
+                "jms/serializer": "0.16.*",
+                "phpdocumentor/phpdocumentor": "2.*",
+                "phpunit/phpunit": "4.8.*",
+                "symfony/debug": "2.8.*",
+                "symfony/filesystem": "2.8.*",
+                "symfony/translation": "2.8.*",
+                "symfony/yaml": "2.8.*",
+                "zendframework/zend-cache": "2.5.1",
+                "zendframework/zend-config": "2.5.1",
+                "zendframework/zend-eventmanager": "2.5.1",
+                "zendframework/zend-filter": "2.5.1",
+                "zendframework/zend-i18n": "2.5.1",
+                "zendframework/zend-json": "2.5.1",
+                "zendframework/zend-math": "2.5.1",
+                "zendframework/zend-serializer": "2.5.*",
+                "zendframework/zend-servicemanager": "2.5.*",
+                "zendframework/zend-stdlib": "2.5.1"
             },
             "suggest": {
-                "league/oauth2-client": "Needed for XOAUTH2 authentication",
-                "league/oauth2-google": "Needed for Gmail XOAUTH2"
+                "league/oauth2-google": "Needed for Google XOAUTH2 authentication"
             },
             "type": "library",
             "autoload": {
@@ -113,7 +128,7 @@
                 }
             ],
             "description": "PHPMailer is a full-featured email creation and transfer class for PHP",
-            "time": "2015-11-01T10:15:28+00:00"
+            "time": "2017-03-15T19:32:56+00:00"
         }
     ],
     "packages-dev": [