diff --git a/inc/composer.json b/inc/composer.json
index 84f1e4f..902497a 100644
--- a/inc/composer.json
+++ b/inc/composer.json
@@ -3,6 +3,6 @@
         "firebase/php-jwt": "^3.0",
         "ktamas77/firebase-php": "dev-master",
         "firebase/token-generator": "^3.0",
-        "phpmailer/phpmailer": "^5.2"
+        "phpmailer/phpmailer": "^6.5"
     }
 }
diff --git a/inc/composer.lock b/inc/composer.lock
index 4b41357..230a227 100644
--- a/inc/composer.lock
+++ b/inc/composer.lock
@@ -1,11 +1,10 @@
 {
     "_readme": [
         "This file locks the dependencies of your project to a known state",
-        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "hash": "4d797db3fca2754fd2efbdd8058130dd",
-    "content-hash": "68de5d0f185758bdf4f059be9a593aa7",
+    "content-hash": "8cc75f91de53ec7e892dcdd9ae78db2f",
     "packages": [
         {
             "name": "firebase/php-jwt",
@@ -48,7 +47,7 @@
             ],
             "description": "A simple library to encode and decode JSON Web Tokens (JWT) in PHP. Should conform to the current spec.",
             "homepage": "https://github.com/firebase/php-jwt",
-            "time": "2015-07-22 18:31:08"
+            "time": "2015-07-22T18:31:08+00:00"
         },
         {
             "name": "firebase/token-generator",
@@ -100,7 +99,7 @@
             ],
             "description": "A simple library to generate JWT tokens for authenticating to a Firebase.",
             "homepage": "https://github.com/firebase/firebase-token-generator-php",
-            "time": "2015-11-19 06:18:40"
+            "time": "2015-11-19T06:18:40+00:00"
         },
         {
             "name": "ktamas77/firebase-php",
@@ -142,58 +141,63 @@
                 "rest",
                 "wrapper"
             ],
-            "time": "2015-05-08 02:43:44"
+            "time": "2015-05-08T02:43:44+00:00"
         },
         {
             "name": "phpmailer/phpmailer",
-            "version": "v5.2.14",
+            "version": "v6.5.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/PHPMailer/PHPMailer.git",
-                "reference": "e774bc9152de85547336e22b8926189e582ece95"
+                "reference": "a5b5c43e50b7fba655f793ad27303cd74c57363c"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/PHPMailer/PHPMailer/zipball/e774bc9152de85547336e22b8926189e582ece95",
-                "reference": "e774bc9152de85547336e22b8926189e582ece95",
+                "url": "https://api.github.com/repos/PHPMailer/PHPMailer/zipball/a5b5c43e50b7fba655f793ad27303cd74c57363c",
+                "reference": "a5b5c43e50b7fba655f793ad27303cd74c57363c",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.0.0"
+                "ext-ctype": "*",
+                "ext-filter": "*",
+                "ext-hash": "*",
+                "php": ">=5.5.0"
             },
             "require-dev": {
-                "phpdocumentor/phpdocumentor": "*",
-                "phpunit/phpunit": "4.7.*"
+                "dealerdirect/phpcodesniffer-composer-installer": "^0.7.0",
+                "doctrine/annotations": "^1.2",
+                "phpcompatibility/php-compatibility": "^9.3.5",
+                "roave/security-advisories": "dev-latest",
+                "squizlabs/php_codesniffer": "^3.5.6",
+                "yoast/phpunit-polyfills": "^0.2.0"
             },
             "suggest": {
-                "league/oauth2-client": "Needed for XOAUTH2 authentication",
-                "league/oauth2-google": "Needed for Gmail XOAUTH2"
+                "ext-mbstring": "Needed to send email in multibyte encoding charset or decode encoded addresses",
+                "hayageek/oauth2-yahoo": "Needed for Yahoo XOAUTH2 authentication",
+                "league/oauth2-google": "Needed for Google XOAUTH2 authentication",
+                "psr/log": "For optional PSR-3 debug logging",
+                "stevenmaguire/oauth2-microsoft": "Needed for Microsoft XOAUTH2 authentication",
+                "symfony/polyfill-mbstring": "To support UTF-8 if the Mbstring PHP extension is not enabled (^1.2)"
             },
             "type": "library",
             "autoload": {
-                "classmap": [
-                    "class.phpmailer.php",
-                    "class.phpmaileroauth.php",
-                    "class.phpmaileroauthgoogle.php",
-                    "class.smtp.php",
-                    "class.pop3.php",
-                    "extras/EasyPeasyICS.php",
-                    "extras/ntlm_sasl_client.php"
-                ]
+                "psr-4": {
+                    "PHPMailer\\PHPMailer\\": "src/"
+                }
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
-                "LGPL-2.1"
+                "LGPL-2.1-only"
             ],
             "authors": [
-                {
-                    "name": "Jim Jagielski",
-                    "email": "jimjag@gmail.com"
-                },
                 {
                     "name": "Marcus Bointon",
                     "email": "phpmailer@synchromedia.co.uk"
                 },
+                {
+                    "name": "Jim Jagielski",
+                    "email": "jimjag@gmail.com"
+                },
                 {
                     "name": "Andy Prevost",
                     "email": "codeworxtech@users.sourceforge.net"
@@ -203,7 +207,17 @@
                 }
             ],
             "description": "PHPMailer is a full-featured email creation and transfer class for PHP",
-            "time": "2015-11-01 10:15:28"
+            "support": {
+                "issues": "https://github.com/PHPMailer/PHPMailer/issues",
+                "source": "https://github.com/PHPMailer/PHPMailer/tree/v6.5.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/Synchro",
+                    "type": "github"
+                }
+            ],
+            "time": "2021-06-16T14:33:43+00:00"
         }
     ],
     "packages-dev": [],
@@ -215,5 +229,6 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": [],
-    "platform-dev": []
+    "platform-dev": [],
+    "plugin-api-version": "2.1.0"
 }