diff --git a/composer.json b/composer.json
index 8bd0d8f0..5c9b02bb 100644
--- a/composer.json
+++ b/composer.json
@@ -7,7 +7,7 @@
 	],
 	"require": {
 		"php": "^7.2 || ^8.0",
-		"phpstan/phpstan": "^1.12.12"
+		"phpstan/phpstan": "^1.12.23"
 	},
 	"conflict": {
 		"doctrine/collections": "<1.0",
diff --git a/src/Type/Doctrine/DBAL/RowCountMethodDynamicReturnTypeExtension.php b/src/Type/Doctrine/DBAL/RowCountMethodDynamicReturnTypeExtension.php
index 8fe17348..c754a41b 100644
--- a/src/Type/Doctrine/DBAL/RowCountMethodDynamicReturnTypeExtension.php
+++ b/src/Type/Doctrine/DBAL/RowCountMethodDynamicReturnTypeExtension.php
@@ -66,9 +66,6 @@ public function getTypeFromMethodCall(MethodReflection $methodReflection, Method
 		}
 
 		$resultClass = $this->getResultClass($driver);
-		if ($resultClass === null) {
-			return null;
-		}
 
 		if (!$this->reflectionProvider->hasClass($resultClass)) {
 			return null;
@@ -87,9 +84,9 @@ public function getTypeFromMethodCall(MethodReflection $methodReflection, Method
 
 	/**
 	 * @param DriverDetector::* $driver
-	 * @return class-string<DriverResult>|null
+	 * @return class-string<DriverResult>
 	 */
-	private function getResultClass(string $driver): ?string
+	private function getResultClass(string $driver): string
 	{
 		switch ($driver) {
 			case DriverDetector::IBM_DB2:
@@ -111,8 +108,6 @@ private function getResultClass(string $driver): ?string
 			case DriverDetector::SQLSRV:
 				return 'Doctrine\DBAL\Driver\SQLSrv\Result';
 		}
-
-		return null;
 	}
 
 }