diff --git a/application/Espo/Core/Upgrades/Actions/Base.php b/application/Espo/Core/Upgrades/Actions/Base.php
index afd75ff314..a2f6662191 100644
--- a/application/Espo/Core/Upgrades/Actions/Base.php
+++ b/application/Espo/Core/Upgrades/Actions/Base.php
@@ -392,7 +392,7 @@ abstract class Base
     }
 
     /**
-     * @param string[] $versionList
+     * @param string[]|string $versionList
      * @param string $currentVersion
      * @param string $errorMessage
      * @return bool
diff --git a/application/Espo/Core/Upgrades/Actions/Extension/Install.php b/application/Espo/Core/Upgrades/Actions/Extension/Install.php
index bbe47f8e5d..f1797ca3b1 100644
--- a/application/Espo/Core/Upgrades/Actions/Extension/Install.php
+++ b/application/Espo/Core/Upgrades/Actions/Extension/Install.php
@@ -249,7 +249,7 @@ class Install extends \Espo\Core\Upgrades\Actions\Base\Install
     }
 
     /**
-     * @param array<string,string[]> $dependencyList
+     * @param array<string,string[]|string> $dependencyList
      * @return bool
      */
     protected function checkDependencies($dependencyList)
diff --git a/application/Espo/Core/Upgrades/Actions/Extension/Upload.php b/application/Espo/Core/Upgrades/Actions/Extension/Upload.php
index afd7a641af..824c5f5a46 100644
--- a/application/Espo/Core/Upgrades/Actions/Extension/Upload.php
+++ b/application/Espo/Core/Upgrades/Actions/Extension/Upload.php
@@ -35,7 +35,7 @@ class Upload extends \Espo\Core\Upgrades\Actions\Base\Upload
     /**
      * Check dependencies.
      *
-     * @param array<string,string[]>|string $dependencyList
+     * @param array<string,string[]|string> $dependencyList
      * @return bool
      */
     protected function checkDependencies($dependencyList)
diff --git a/application/Espo/Core/Upgrades/Actions/Helper.php b/application/Espo/Core/Upgrades/Actions/Helper.php
index 61079f8c7c..4135693a6a 100644
--- a/application/Espo/Core/Upgrades/Actions/Helper.php
+++ b/application/Espo/Core/Upgrades/Actions/Helper.php
@@ -67,15 +67,17 @@ class Helper
     /**
      * Check dependencies.
      *
-     * @param array<string,string[]>|string $dependencyList
+     * @param array<string,string[]|string> $dependencyList
      * @return bool
      */
     public function checkDependencies($dependencyList)
     {
-        if (!is_array($dependencyList)) {
+        if (!is_array($dependencyList)) { /** @phpstan-ignore-line */
             $dependencyList = (array) $dependencyList;
         }
 
+        /** @var array<string,string[]|string> $dependencyList */
+
         $actionObject = $this->getActionObject();
 
         foreach ($dependencyList as $extensionName => $extensionVersion) {
@@ -88,8 +90,12 @@ class Helper
                 ])
                 ->findOne();
 
-            $errorMessage = 'Dependency Error: The extension "'.$extensionName.'" with version "'.
-                $extensionVersion.'" is missing.';
+            $versionString = is_array($extensionVersion) ?
+                implode(', ', $extensionVersion) :
+                $extensionVersion;
+
+            $errorMessage = 'Dependency Error: The extension "' . $extensionName .'" with version "'.
+                $versionString . '" is missing.';
 
             if (
                 !isset($dependencyExtensionEntity) ||