diff --git a/application/Espo/Core/Formula/Functions/ArrayGroup/JoinType.php b/application/Espo/Core/Formula/Functions/ArrayGroup/JoinType.php
index 2eb79eac87..39e111086f 100644
--- a/application/Espo/Core/Formula/Functions/ArrayGroup/JoinType.php
+++ b/application/Espo/Core/Formula/Functions/ArrayGroup/JoinType.php
@@ -50,10 +50,6 @@ class JoinType extends BaseFunction
             $this->throwBadArgumentValue(2, 'string');
         }
 
-        if (is_null($list)) {
-            return '';
-        }
-
         return implode($separator, $list);
     }
 }
diff --git a/application/Espo/Core/Upgrades/Actions/Base.php b/application/Espo/Core/Upgrades/Actions/Base.php
index 9bfff0bfbe..03a9c2ad2b 100644
--- a/application/Espo/Core/Upgrades/Actions/Base.php
+++ b/application/Espo/Core/Upgrades/Actions/Base.php
@@ -283,7 +283,7 @@ abstract class Base
     }
 
     /**
-     * @param never $data
+     * @param mixed $data
      * @return mixed
      */
     abstract public function run($data);
diff --git a/application/Espo/Core/Utils/File/Manager.php b/application/Espo/Core/Utils/File/Manager.php
index 820e397c18..5a8c3bf8e8 100644
--- a/application/Espo/Core/Utils/File/Manager.php
+++ b/application/Espo/Core/Utils/File/Manager.php
@@ -904,6 +904,8 @@ class Manager
 
     /**
      * Check whether a path is a directory.
+     *
+     * @phpstan-impure
      */
     public function isDir(string $dirPath): bool
     {
@@ -912,6 +914,8 @@ class Manager
 
     /**
      * Check whether a file.
+     *
+     * @phpstan-impure
      */
     public function isFile(string $path): bool
     {
diff --git a/application/Espo/EntryPoints/Image.php b/application/Espo/EntryPoints/Image.php
index 42a57b4d03..136785aeaa 100644
--- a/application/Espo/EntryPoints/Image.php
+++ b/application/Espo/EntryPoints/Image.php
@@ -238,9 +238,9 @@ class Image implements EntryPoint
             throw new Error();
         }
 
-        list($originalWidth, $originalHeight) = getimagesize($filePath);
+        [$originalWidth, $originalHeight] = getimagesize($filePath);
 
-        list($width, $height) = $this->getSizes()[$size];
+        [$width, $height] = $this->getSizes()[$size];
 
         if ($originalWidth <= $width && $originalHeight <= $height) {
             $targetWidth = $originalWidth;
@@ -249,19 +249,19 @@ class Image implements EntryPoint
         else {
             if ($originalWidth > $originalHeight) {
                 $targetWidth = $width;
-                $targetHeight = $originalHeight / ($originalWidth / $width);
+                $targetHeight = (int) ($originalHeight / ($originalWidth / $width));
 
                 if ($targetHeight > $height) {
                     $targetHeight = $height;
-                    $targetWidth = $originalWidth / ($originalHeight / $height);
+                    $targetWidth = (int) ($originalWidth / ($originalHeight / $height));
                 }
             } else {
                 $targetHeight = $height;
-                $targetWidth = $originalWidth / ($originalHeight / $height);
+                $targetWidth = (int) ($originalWidth / ($originalHeight / $height));
 
                 if ($targetWidth > $width) {
                     $targetWidth = $width;
-                    $targetHeight = $originalHeight / ($originalWidth / $width);
+                    $targetHeight = (int) ($originalHeight / ($originalWidth / $width));
                 }
             }
         }
diff --git a/application/Espo/Modules/Crm/Hooks/Opportunity/Probability.php b/application/Espo/Modules/Crm/Hooks/Opportunity/Probability.php
index 18135631bc..469b0c3648 100644
--- a/application/Espo/Modules/Crm/Hooks/Opportunity/Probability.php
+++ b/application/Espo/Modules/Crm/Hooks/Opportunity/Probability.php
@@ -66,10 +66,6 @@ class Probability implements BeforeSave
         $probability = $this->metadata
             ->get('entityDefs.Opportunity.fields.stage.probabilityMap.' . $stage) ?? 0;
 
-        if ($probability === null) {
-            return;
-        }
-
         $entity->setProbability($probability);
     }
 }
diff --git a/application/Espo/Repositories/Email.php b/application/Espo/Repositories/Email.php
index c097de8f23..bb0cd545eb 100644
--- a/application/Espo/Repositories/Email.php
+++ b/application/Espo/Repositories/Email.php
@@ -69,14 +69,12 @@ class Email extends Database implements
 
         if (!empty($addressValue)) {
             $addressList = array_map(
-                function ($item) {
-                    return trim($item);
-                },
+                fn ($item) => trim($item),
                 explode(';', $addressValue)
             );
 
             $addressList = array_filter($addressList, function ($item) {
-                return filter_var($item, FILTER_VALIDATE_EMAIL);
+                return filter_var($item, FILTER_VALIDATE_EMAIL) !== false;
             });
 
             $idList = $eaRepository->getIdListFormAddressList($addressList);
diff --git a/application/Espo/Tools/EmailTemplate/Formatter.php b/application/Espo/Tools/EmailTemplate/Formatter.php
index 613f94f9e3..75a707f738 100644
--- a/application/Espo/Tools/EmailTemplate/Formatter.php
+++ b/application/Espo/Tools/EmailTemplate/Formatter.php
@@ -37,6 +37,8 @@ use Espo\Core\Utils\DateTime as DateTimeUtil;
 use Espo\Core\Utils\NumberUtil;
 use Espo\Core\Utils\Language;
 
+use Stringable;
+
 class Formatter
 {
     private Metadata $metadata;
@@ -163,7 +165,10 @@ class Formatter
             return $this->number->format($value);
         }
 
-        if (!is_string($value) && is_scalar($value) || is_callable([$value, '__toString'])) {
+        if (
+            !is_string($value) && is_scalar($value) ||
+            $value instanceof Stringable
+        ) {
             return strval($value);
         }
 
diff --git a/composer.lock b/composer.lock
index dcc7592ae1..a239447f36 100644
--- a/composer.lock
+++ b/composer.lock
@@ -6884,16 +6884,16 @@
         },
         {
             "name": "phpstan/phpstan",
-            "version": "1.10.14",
+            "version": "1.10.57",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpstan/phpstan.git",
-                "reference": "d232901b09e67538e5c86a724be841bea5768a7c"
+                "reference": "1627b1d03446904aaa77593f370c5201d2ecc34e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/d232901b09e67538e5c86a724be841bea5768a7c",
-                "reference": "d232901b09e67538e5c86a724be841bea5768a7c",
+                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/1627b1d03446904aaa77593f370c5201d2ecc34e",
+                "reference": "1627b1d03446904aaa77593f370c5201d2ecc34e",
                 "shasum": ""
             },
             "require": {
@@ -6942,7 +6942,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2023-04-19T13:47:27+00:00"
+            "time": "2024-01-24T11:51:34+00:00"
         },
         {
             "name": "phpunit/php-code-coverage",