diff --git a/.php-cs-fixer.php b/.php-cs-fixer.php
index 6cdbb88..66ec59c 100644
--- a/.php-cs-fixer.php
+++ b/.php-cs-fixer.php
@@ -10,7 +10,6 @@ return $config->setRules([
         '@Symfony' => true,
         '@DoctrineAnnotation' => true,
         'array_indentation' => true,
-        'array_syntax' => ['syntax' => 'short'],
     ])
     ->setFinder($finder)
 ;
diff --git a/composer.lock b/composer.lock
index 211982b..55b312e 100644
--- a/composer.lock
+++ b/composer.lock
@@ -8,16 +8,16 @@
     "packages": [
         {
             "name": "phpmailer/phpmailer",
-            "version": "v6.4.1",
+            "version": "v6.5.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/PHPMailer/PHPMailer.git",
-                "reference": "9256f12d8fb0cd0500f93b19e18c356906cbed3d"
+                "reference": "dd803df5ad7492e1b40637f7ebd258fee5ca7355"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/PHPMailer/PHPMailer/zipball/9256f12d8fb0cd0500f93b19e18c356906cbed3d",
-                "reference": "9256f12d8fb0cd0500f93b19e18c356906cbed3d",
+                "url": "https://api.github.com/repos/PHPMailer/PHPMailer/zipball/dd803df5ad7492e1b40637f7ebd258fee5ca7355",
+                "reference": "dd803df5ad7492e1b40637f7ebd258fee5ca7355",
                 "shasum": ""
             },
             "require": {
@@ -29,10 +29,12 @@
             "require-dev": {
                 "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",
                 "phpcompatibility/php-compatibility": "^9.3.5",
                 "roave/security-advisories": "dev-latest",
-                "squizlabs/php_codesniffer": "^3.5.6",
-                "yoast/phpunit-polyfills": "^0.2.0"
+                "squizlabs/php_codesniffer": "^3.6.0",
+                "yoast/phpunit-polyfills": "^1.0.0"
             },
             "suggest": {
                 "ext-mbstring": "Needed to send email in multibyte encoding charset or decode encoded addresses",
@@ -72,7 +74,7 @@
             "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/v6.4.1"
+                "source": "https://github.com/PHPMailer/PHPMailer/tree/v6.5.1"
             },
             "funding": [
                 {
@@ -80,7 +82,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2021-04-29T12:25:04+00:00"
+            "time": "2021-08-18T09:14:16+00:00"
         },
         {
             "name": "symfony/polyfill-ctype",
@@ -163,16 +165,16 @@
         },
         {
             "name": "symfony/polyfill-mbstring",
-            "version": "v1.23.0",
+            "version": "v1.23.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-mbstring.git",
-                "reference": "2df51500adbaebdc4c38dea4c89a2e131c45c8a1"
+                "reference": "9174a3d80210dca8daa7f31fec659150bbeabfc6"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/2df51500adbaebdc4c38dea4c89a2e131c45c8a1",
-                "reference": "2df51500adbaebdc4c38dea4c89a2e131c45c8a1",
+                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/9174a3d80210dca8daa7f31fec659150bbeabfc6",
+                "reference": "9174a3d80210dca8daa7f31fec659150bbeabfc6",
                 "shasum": ""
             },
             "require": {
@@ -223,7 +225,7 @@
                 "shim"
             ],
             "support": {
-                "source": "https://github.com/symfony/polyfill-mbstring/tree/v1.23.0"
+                "source": "https://github.com/symfony/polyfill-mbstring/tree/v1.23.1"
             },
             "funding": [
                 {
@@ -239,20 +241,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-05-27T09:27:20+00:00"
+            "time": "2021-05-27T12:26:48+00:00"
         },
         {
             "name": "twig/twig",
-            "version": "v3.3.2",
+            "version": "v3.3.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/twigphp/Twig.git",
-                "reference": "21578f00e83d4a82ecfa3d50752b609f13de6790"
+                "reference": "a27fa056df8a6384316288ca8b0fa3a35fdeb569"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/twigphp/Twig/zipball/21578f00e83d4a82ecfa3d50752b609f13de6790",
-                "reference": "21578f00e83d4a82ecfa3d50752b609f13de6790",
+                "url": "https://api.github.com/repos/twigphp/Twig/zipball/a27fa056df8a6384316288ca8b0fa3a35fdeb569",
+                "reference": "a27fa056df8a6384316288ca8b0fa3a35fdeb569",
                 "shasum": ""
             },
             "require": {
@@ -262,7 +264,7 @@
             },
             "require-dev": {
                 "psr/container": "^1.0",
-                "symfony/phpunit-bridge": "^4.4.9|^5.0.9"
+                "symfony/phpunit-bridge": "^4.4.9|^5.0.9|^6.0"
             },
             "type": "library",
             "extra": {
@@ -303,7 +305,7 @@
             ],
             "support": {
                 "issues": "https://github.com/twigphp/Twig/issues",
-                "source": "https://github.com/twigphp/Twig/tree/v3.3.2"
+                "source": "https://github.com/twigphp/Twig/tree/v3.3.3"
             },
             "funding": [
                 {
@@ -315,7 +317,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-05-16T12:14:13+00:00"
+            "time": "2021-09-17T08:44:23+00:00"
         }
     ],
     "packages-dev": [
@@ -402,21 +404,21 @@
         },
         {
             "name": "composer/xdebug-handler",
-            "version": "2.0.1",
+            "version": "2.0.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/composer/xdebug-handler.git",
-                "reference": "964adcdd3a28bf9ed5d9ac6450064e0d71ed7496"
+                "reference": "84674dd3a7575ba617f5a76d7e9e29a7d3891339"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/composer/xdebug-handler/zipball/964adcdd3a28bf9ed5d9ac6450064e0d71ed7496",
-                "reference": "964adcdd3a28bf9ed5d9ac6450064e0d71ed7496",
+                "url": "https://api.github.com/repos/composer/xdebug-handler/zipball/84674dd3a7575ba617f5a76d7e9e29a7d3891339",
+                "reference": "84674dd3a7575ba617f5a76d7e9e29a7d3891339",
                 "shasum": ""
             },
             "require": {
                 "php": "^5.3.2 || ^7.0 || ^8.0",
-                "psr/log": "^1.0"
+                "psr/log": "^1 || ^2 || ^3"
             },
             "require-dev": {
                 "phpstan/phpstan": "^0.12.55",
@@ -446,7 +448,7 @@
             "support": {
                 "irc": "irc://irc.freenode.org/composer",
                 "issues": "https://github.com/composer/xdebug-handler/issues",
-                "source": "https://github.com/composer/xdebug-handler/tree/2.0.1"
+                "source": "https://github.com/composer/xdebug-handler/tree/2.0.2"
             },
             "funding": [
                 {
@@ -462,20 +464,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-05-05T19:37:51+00:00"
+            "time": "2021-07-31T17:03:58+00:00"
         },
         {
             "name": "doctrine/annotations",
-            "version": "1.13.1",
+            "version": "1.13.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/doctrine/annotations.git",
-                "reference": "e6e7b7d5b45a2f2abc5460cc6396480b2b1d321f"
+                "reference": "5b668aef16090008790395c02c893b1ba13f7e08"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/doctrine/annotations/zipball/e6e7b7d5b45a2f2abc5460cc6396480b2b1d321f",
-                "reference": "e6e7b7d5b45a2f2abc5460cc6396480b2b1d321f",
+                "url": "https://api.github.com/repos/doctrine/annotations/zipball/5b668aef16090008790395c02c893b1ba13f7e08",
+                "reference": "5b668aef16090008790395c02c893b1ba13f7e08",
                 "shasum": ""
             },
             "require": {
@@ -532,9 +534,9 @@
             ],
             "support": {
                 "issues": "https://github.com/doctrine/annotations/issues",
-                "source": "https://github.com/doctrine/annotations/tree/1.13.1"
+                "source": "https://github.com/doctrine/annotations/tree/1.13.2"
             },
-            "time": "2021-05-16T18:07:53+00:00"
+            "time": "2021-08-05T19:00:23+00:00"
         },
         {
             "name": "doctrine/lexer",
@@ -618,16 +620,16 @@
         },
         {
             "name": "friendsofphp/php-cs-fixer",
-            "version": "v3.0.0",
+            "version": "v3.2.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/FriendsOfPHP/PHP-CS-Fixer.git",
-                "reference": "c15377bdfa8d1ecf186f1deadec39c89984e1167"
+                "reference": "13ae36a76b6e329e44ca3cafaa784ea02db9ff14"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/FriendsOfPHP/PHP-CS-Fixer/zipball/c15377bdfa8d1ecf186f1deadec39c89984e1167",
-                "reference": "c15377bdfa8d1ecf186f1deadec39c89984e1167",
+                "url": "https://api.github.com/repos/FriendsOfPHP/PHP-CS-Fixer/zipball/13ae36a76b6e329e44ca3cafaa784ea02db9ff14",
+                "reference": "13ae36a76b6e329e44ca3cafaa784ea02db9ff14",
                 "shasum": ""
             },
             "require": {
@@ -636,20 +638,22 @@
                 "doctrine/annotations": "^1.12",
                 "ext-json": "*",
                 "ext-tokenizer": "*",
-                "php": "^7.1.3 || ^8.0",
+                "php": "^7.2 || ^8.0",
                 "php-cs-fixer/diff": "^2.0",
                 "symfony/console": "^4.4.20 || ^5.1.3",
                 "symfony/event-dispatcher": "^4.4.20 || ^5.0",
                 "symfony/filesystem": "^4.4.20 || ^5.0",
                 "symfony/finder": "^4.4.20 || ^5.0",
                 "symfony/options-resolver": "^4.4.20 || ^5.0",
-                "symfony/polyfill-php72": "^1.22",
+                "symfony/polyfill-php72": "^1.23",
+                "symfony/polyfill-php80": "^1.23",
+                "symfony/polyfill-php81": "^1.23",
                 "symfony/process": "^4.4.20 || ^5.0",
                 "symfony/stopwatch": "^4.4.20 || ^5.0"
             },
             "require-dev": {
                 "justinrainbow/json-schema": "^5.2",
-                "keradus/cli-executor": "^1.4",
+                "keradus/cli-executor": "^1.5",
                 "mikey179/vfsstream": "^1.6.8",
                 "php-coveralls/php-coveralls": "^2.4.3",
                 "php-cs-fixer/accessible-object": "^1.1",
@@ -694,7 +698,7 @@
             "description": "A tool to automatically fix PHP code style",
             "support": {
                 "issues": "https://github.com/FriendsOfPHP/PHP-CS-Fixer/issues",
-                "source": "https://github.com/FriendsOfPHP/PHP-CS-Fixer/tree/v3.0.0"
+                "source": "https://github.com/FriendsOfPHP/PHP-CS-Fixer/tree/v3.2.1"
             },
             "funding": [
                 {
@@ -702,7 +706,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2021-05-03T21:51:58+00:00"
+            "time": "2021-10-05T08:12:17+00:00"
         },
         {
             "name": "php-cs-fixer/diff",
@@ -955,16 +959,16 @@
         },
         {
             "name": "symfony/console",
-            "version": "v5.3.0",
+            "version": "v5.3.7",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/console.git",
-                "reference": "058553870f7809087fa80fa734704a21b9bcaeb2"
+                "reference": "8b1008344647462ae6ec57559da166c2bfa5e16a"
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             "dist": {
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-                "url": "https://api.github.com/repos/symfony/console/zipball/058553870f7809087fa80fa734704a21b9bcaeb2",
-                "reference": "058553870f7809087fa80fa734704a21b9bcaeb2",
+                "url": "https://api.github.com/repos/symfony/console/zipball/8b1008344647462ae6ec57559da166c2bfa5e16a",
+                "reference": "8b1008344647462ae6ec57559da166c2bfa5e16a",
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@@ -972,11 +976,12 @@
                 "symfony/deprecation-contracts": "^2.1",
                 "symfony/polyfill-mbstring": "~1.0",
                 "symfony/polyfill-php73": "^1.8",
-                "symfony/polyfill-php80": "^1.15",
+                "symfony/polyfill-php80": "^1.16",
                 "symfony/service-contracts": "^1.1|^2",
                 "symfony/string": "^5.1"
             },
             "conflict": {
+                "psr/log": ">=3",
                 "symfony/dependency-injection": "<4.4",
                 "symfony/dotenv": "<5.1",
                 "symfony/event-dispatcher": "<4.4",
@@ -984,10 +989,10 @@
                 "symfony/process": "<4.4"
             },
             "provide": {
-                "psr/log-implementation": "1.0"
+                "psr/log-implementation": "1.0|2.0"
             },
             "require-dev": {
-                "psr/log": "~1.0",
+                "psr/log": "^1|^2",
                 "symfony/config": "^4.4|^5.0",
                 "symfony/dependency-injection": "^4.4|^5.0",
                 "symfony/event-dispatcher": "^4.4|^5.0",
@@ -1033,7 +1038,7 @@
                 "terminal"
             ],
             "support": {
-                "source": "https://github.com/symfony/console/tree/v5.3.0"
+                "source": "https://github.com/symfony/console/tree/v5.3.7"
             },
             "funding": [
                 {
@@ -1049,7 +1054,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-05-26T17:43:10+00:00"
+            "time": "2021-08-25T20:02:16+00:00"
         },
         {
             "name": "symfony/deprecation-contracts",
@@ -1120,23 +1125,23 @@
         },
         {
             "name": "symfony/event-dispatcher",
-            "version": "v5.3.0",
+            "version": "v5.3.7",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/event-dispatcher.git",
-                "reference": "67a5f354afa8e2f231081b3fa11a5912f933c3ce"
+                "reference": "ce7b20d69c66a20939d8952b617506a44d102130"
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             "dist": {
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-                "url": "https://api.github.com/repos/symfony/event-dispatcher/zipball/67a5f354afa8e2f231081b3fa11a5912f933c3ce",
-                "reference": "67a5f354afa8e2f231081b3fa11a5912f933c3ce",
+                "url": "https://api.github.com/repos/symfony/event-dispatcher/zipball/ce7b20d69c66a20939d8952b617506a44d102130",
+                "reference": "ce7b20d69c66a20939d8952b617506a44d102130",
                 "shasum": ""
             },
             "require": {
                 "php": ">=7.2.5",
                 "symfony/deprecation-contracts": "^2.1",
                 "symfony/event-dispatcher-contracts": "^2",
-                "symfony/polyfill-php80": "^1.15"
+                "symfony/polyfill-php80": "^1.16"
             },
             "conflict": {
                 "symfony/dependency-injection": "<4.4"
@@ -1146,7 +1151,7 @@
                 "symfony/event-dispatcher-implementation": "2.0"
             },
             "require-dev": {
-                "psr/log": "~1.0",
+                "psr/log": "^1|^2|^3",
                 "symfony/config": "^4.4|^5.0",
                 "symfony/dependency-injection": "^4.4|^5.0",
                 "symfony/error-handler": "^4.4|^5.0",
@@ -1185,7 +1190,7 @@
             "description": "Provides tools that allow your application components to communicate with each other by dispatching events and listening to them",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/event-dispatcher/tree/v5.3.0"
+                "source": "https://github.com/symfony/event-dispatcher/tree/v5.3.7"
             },
             "funding": [
                 {
@@ -1201,7 +1206,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-05-26T17:43:10+00:00"
+            "time": "2021-08-04T21:20:46+00:00"
         },
         {
             "name": "symfony/event-dispatcher-contracts",
@@ -1284,21 +1289,22 @@
         },
         {
             "name": "symfony/filesystem",
-            "version": "v5.3.0",
+            "version": "v5.3.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/filesystem.git",
-                "reference": "348116319d7fb7d1faa781d26a48922428013eb2"
+                "reference": "343f4fe324383ca46792cae728a3b6e2f708fb32"
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-                "url": "https://api.github.com/repos/symfony/filesystem/zipball/348116319d7fb7d1faa781d26a48922428013eb2",
-                "reference": "348116319d7fb7d1faa781d26a48922428013eb2",
+                "url": "https://api.github.com/repos/symfony/filesystem/zipball/343f4fe324383ca46792cae728a3b6e2f708fb32",
+                "reference": "343f4fe324383ca46792cae728a3b6e2f708fb32",
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             },
             "require": {
                 "php": ">=7.2.5",
-                "symfony/polyfill-ctype": "~1.8"
+                "symfony/polyfill-ctype": "~1.8",
+                "symfony/polyfill-php80": "^1.16"
             },
             "type": "library",
             "autoload": {
@@ -1326,7 +1332,7 @@
             "description": "Provides basic utilities for the filesystem",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/filesystem/tree/v5.3.0"
+                "source": "https://github.com/symfony/filesystem/tree/v5.3.4"
             },
             "funding": [
                 {
@@ -1342,24 +1348,25 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-05-26T17:43:10+00:00"
+            "time": "2021-07-21T12:40:44+00:00"
         },
         {
             "name": "symfony/finder",
-            "version": "v5.3.0",
+            "version": "v5.3.7",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/finder.git",
-                "reference": "0ae3f047bed4edff6fd35b26a9a6bfdc92c953c6"
+                "reference": "a10000ada1e600d109a6c7632e9ac42e8bf2fb93"
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-                "reference": "0ae3f047bed4edff6fd35b26a9a6bfdc92c953c6",
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+                "reference": "a10000ada1e600d109a6c7632e9ac42e8bf2fb93",
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             },
             "require": {
-                "php": ">=7.2.5"
+                "php": ">=7.2.5",
+                "symfony/polyfill-php80": "^1.16"
             },
             "type": "library",
             "autoload": {
@@ -1387,7 +1394,7 @@
             "description": "Finds files and directories via an intuitive fluent interface",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/finder/tree/v5.3.0"
+                "source": "https://github.com/symfony/finder/tree/v5.3.7"
             },
             "funding": [
                 {
@@ -1403,27 +1410,27 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-05-26T12:52:38+00:00"
+            "time": "2021-08-04T21:20:46+00:00"
         },
         {
             "name": "symfony/options-resolver",
-            "version": "v5.3.0",
+            "version": "v5.3.7",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/options-resolver.git",
-                "reference": "162e886ca035869866d233a2bfef70cc28f9bbe5"
+                "reference": "4b78e55b179003a42523a362cc0e8327f7a69b5e"
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             "dist": {
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-                "symfony/polyfill-php80": "^1.15"
+                "symfony/polyfill-php80": "^1.16"
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@@ -1456,7 +1463,7 @@
                 "options"
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-                "source": "https://github.com/symfony/options-resolver/tree/v5.3.0"
+                "source": "https://github.com/symfony/options-resolver/tree/v5.3.7"
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@@ -1472,20 +1479,20 @@
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-            "time": "2021-05-26T17:43:10+00:00"
+            "time": "2021-08-04T21:20:46+00:00"
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             "name": "symfony/polyfill-intl-grapheme",
-            "version": "v1.23.0",
+            "version": "v1.23.1",
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-                "reference": "24b72c6baa32c746a4d0840147c9715e42bb68ab"
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@@ -1537,7 +1544,7 @@
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+                "source": "https://github.com/symfony/polyfill-intl-grapheme/tree/v1.23.1"
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@@ -1553,7 +1560,7 @@
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-            "time": "2021-05-27T09:17:38+00:00"
+            "time": "2021-05-27T12:26:48+00:00"
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@@ -1796,16 +1803,16 @@
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-            "version": "v1.23.0",
+            "version": "v1.23.1",
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                 "url": "https://github.com/symfony/polyfill-php80.git",
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@@ -1859,7 +1866,7 @@
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             "support": {
-                "source": "https://github.com/symfony/polyfill-php80/tree/v1.23.0"
+                "source": "https://github.com/symfony/polyfill-php80/tree/v1.23.1"
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@@ -1875,25 +1882,104 @@
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-            "time": "2021-02-19T12:13:01+00:00"
+            "time": "2021-07-28T13:41:28+00:00"
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-            "name": "symfony/process",
-            "version": "v5.3.0",
+            "name": "symfony/polyfill-php81",
+            "version": "v1.23.0",
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                 "type": "git",
-                "url": "https://github.com/symfony/process.git",
-                "reference": "53e36cb1c160505cdaf1ef201501669c4c317191"
+                "url": "https://github.com/symfony/polyfill-php81.git",
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-                "reference": "53e36cb1c160505cdaf1ef201501669c4c317191",
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+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.1"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "1.23-dev"
+                },
+                "thanks": {
+                    "name": "symfony/polyfill",
+                    "url": "https://github.com/symfony/polyfill"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Polyfill\\Php81\\": ""
+                },
+                "files": [
+                    "bootstrap.php"
+                ],
+                "classmap": [
+                    "Resources/stubs"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony polyfill backporting some PHP 8.1+ features to lower PHP versions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "polyfill",
+                "portable",
+                "shim"
+            ],
+            "support": {
+                "source": "https://github.com/symfony/polyfill-php81/tree/v1.23.0"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2021-05-21T13:25:03+00:00"
+        },
+        {
+            "name": "symfony/process",
+            "version": "v5.3.7",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/process.git",
+                "reference": "38f26c7d6ed535217ea393e05634cb0b244a1967"
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+            "dist": {
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+                "url": "https://api.github.com/repos/symfony/process/zipball/38f26c7d6ed535217ea393e05634cb0b244a1967",
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             "require": {
                 "php": ">=7.2.5",
-                "symfony/polyfill-php80": "^1.15"
+                "symfony/polyfill-php80": "^1.16"
             },
             "type": "library",
             "autoload": {
@@ -1921,7 +2007,7 @@
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             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/process/tree/v5.3.0"
+                "source": "https://github.com/symfony/process/tree/v5.3.7"
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@@ -1937,7 +2023,7 @@
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             ],
-            "time": "2021-05-26T12:52:38+00:00"
+            "time": "2021-08-04T21:20:46+00:00"
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             "name": "symfony/service-contracts",
@@ -2020,16 +2106,16 @@
         },
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-            "version": "v5.3.0",
+            "version": "v5.3.4",
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                 "type": "git",
                 "url": "https://github.com/symfony/stopwatch.git",
-                "reference": "313d02f59d6543311865007e5ff4ace05b35ee65"
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-                "reference": "313d02f59d6543311865007e5ff4ace05b35ee65",
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@@ -2062,7 +2148,7 @@
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             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/stopwatch/tree/v5.3.0"
+                "source": "https://github.com/symfony/stopwatch/tree/v5.3.4"
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                 {
@@ -2078,20 +2164,20 @@
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             ],
-            "time": "2021-05-26T17:43:10+00:00"
+            "time": "2021-07-10T08:58:57+00:00"
         },
         {
             "name": "symfony/string",
-            "version": "v5.3.0",
+            "version": "v5.3.7",
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                 "url": "https://github.com/symfony/string.git",
-                "reference": "a9a0f8b6aafc5d2d1c116dcccd1573a95153515b"
+                "reference": "8d224396e28d30f81969f083a58763b8b9ceb0a5"
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-                "reference": "a9a0f8b6aafc5d2d1c116dcccd1573a95153515b",
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@@ -2145,7 +2231,7 @@
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             "support": {
-                "source": "https://github.com/symfony/string/tree/v5.3.0"
+                "source": "https://github.com/symfony/string/tree/v5.3.7"
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                 {
@@ -2161,7 +2247,7 @@
                     "type": "tidelift"
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             ],
-            "time": "2021-05-26T17:43:10+00:00"
+            "time": "2021-08-26T08:00:08+00:00"
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     "aliases": [],
@@ -2176,5 +2262,5 @@
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     },
     "platform-dev": [],
-    "plugin-api-version": "2.0.0"
+    "plugin-api-version": "2.1.0"
 }
diff --git a/etc/config.json b/etc/config.json
index 72f2fba..92c6d83 100644
--- a/etc/config.json
+++ b/etc/config.json
@@ -5,8 +5,8 @@
   "database_dir": "db",
   "images_dir": "html/images",
   "templates_dir": "templates",
-  "mail_alert_upper": 35,
-  "mail_alert_lower": 15,
+  "mail_alert_upper": 30,
+  "mail_alert_lower": 17,
   "mail_from": "cbs-is@ml.riken.jp",
   "mail_from_name": "C407 温度監視プログラム",
   "mail_info_to": "niu-log@ml.riken.jp",