diff --git a/composer.json b/composer.json
index 2cdc0c11..58f7ca10 100644
--- a/composer.json
+++ b/composer.json
@@ -33,7 +33,7 @@
         "ext-Reflection": "*",
         "ext-curl": "*",
         "kint-php/kint": "3.2.2",
-        "phpmailer/phpmailer": "6.0.7",
+        "phpmailer/phpmailer": "6.6.0",
         "tecnickcom/tcpdf": "6.3.2",
         "jasig/phpcas": "1.3.8",
         "yohang/calendr": "^2.0",
diff --git a/composer.lock b/composer.lock
index 4030fa4c..02a2dbde 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "e1be9d73109cd03d9736c6f9031ef52f",
+    "content-hash": "12bc7a3f3862aa83fd8655c62ab7eeef",
     "packages": [
         {
             "name": "adldap2/adldap2",
@@ -2003,34 +2003,36 @@
         },
         {
             "name": "phpmailer/phpmailer",
-            "version": "v6.0.7",
+            "version": "v6.6.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/PHPMailer/PHPMailer.git",
-                "reference": "0c41a36d4508d470e376498c1c0c527aa36a2d59"
+                "reference": "e43bac82edc26ca04b36143a48bde1c051cfd5b1"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/PHPMailer/PHPMailer/zipball/0c41a36d4508d470e376498c1c0c527aa36a2d59",
-                "reference": "0c41a36d4508d470e376498c1c0c527aa36a2d59",
+                "url": "https://api.github.com/repos/PHPMailer/PHPMailer/zipball/e43bac82edc26ca04b36143a48bde1c051cfd5b1",
+                "reference": "e43bac82edc26ca04b36143a48bde1c051cfd5b1",
                 "shasum": ""
             },
             "require": {
                 "ext-ctype": "*",
                 "ext-filter": "*",
+                "ext-hash": "*",
                 "php": ">=5.5.0"
             },
             "require-dev": {
-                "doctrine/annotations": "1.2.*",
-                "friendsofphp/php-cs-fixer": "^2.2",
-                "phpdocumentor/phpdocumentor": "2.*",
-                "phpunit/phpunit": "^4.8 || ^5.7",
-                "zendframework/zend-eventmanager": "3.0.*",
-                "zendframework/zend-i18n": "2.7.3",
-                "zendframework/zend-serializer": "2.7.*"
+                "dealerdirect/phpcodesniffer-composer-installer": "^0.7.0",
+                "doctrine/annotations": "^1.2",
+                "php-parallel-lint/php-console-highlighter": "^0.5.0",
+                "php-parallel-lint/php-parallel-lint": "^1.3.1",
+                "phpcompatibility/php-compatibility": "^9.3.5",
+                "roave/security-advisories": "dev-latest",
+                "squizlabs/php_codesniffer": "^3.6.2",
+                "yoast/phpunit-polyfills": "^1.0.0"
             },
             "suggest": {
-                "ext-mbstring": "Needed to send email in multibyte encoding charset",
+                "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",
@@ -2045,17 +2047,17 @@
             },
             "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"
@@ -2067,9 +2069,15 @@
             "description": "PHPMailer is a full-featured email creation and transfer class for PHP",
             "support": {
                 "issues": "https://github.com/PHPMailer/PHPMailer/issues",
-                "source": "https://github.com/PHPMailer/PHPMailer/tree/v6.0.7"
+                "source": "https://github.com/PHPMailer/PHPMailer/tree/v6.6.0"
             },
-            "time": "2019-02-01T15:04:28+00:00"
+            "funding": [
+                {
+                    "url": "https://github.com/Synchro",
+                    "type": "github"
+                }
+            ],
+            "time": "2022-02-28T15:31:21+00:00"
         },
         {
             "name": "pimple/pimple",
@@ -5178,5 +5186,5 @@
         "ext-curl": "*"
     },
     "platform-dev": [],
-    "plugin-api-version": "2.0.0"
+    "plugin-api-version": "2.2.0"
 }