diff --git a/core/lib/Drupal/Core/Http/ClientFactory.php b/core/lib/Drupal/Core/Http/ClientFactory.php
index e429bbb9cda4734f9c83db529e53afee50d4b3ca..950ebb9724a544aaaed083e646de71714dd4fba5 100644
--- a/core/lib/Drupal/Core/Http/ClientFactory.php
+++ b/core/lib/Drupal/Core/Http/ClientFactory.php
@@ -6,6 +6,7 @@
 use Drupal\Core\Site\Settings;
 use GuzzleHttp\Client;
 use GuzzleHttp\HandlerStack;
+use GuzzleHttp\Utils;
 
 /**
  * Helper class to construct a HTTP client with Drupal specific config.
@@ -49,7 +50,7 @@ public function fromOptions(array $config = []) {
       'verify' => TRUE,
       'timeout' => 30,
       'headers' => [
-        'User-Agent' => 'Drupal/' . \Drupal::VERSION . ' (+https://www.drupal.org/) ' . \GuzzleHttp\default_user_agent(),
+        'User-Agent' => 'Drupal/' . \Drupal::VERSION . ' (+https://www.drupal.org/) ' . Utils::defaultUserAgent(),
       ],
       'handler' => $this->stack,
       // Security consideration: prevent Guzzle from using environment variables
diff --git a/core/phpstan-baseline.neon b/core/phpstan-baseline.neon
index 7857f7891789865ba1d622f33f86524cec19549a..52d14bd6a5e1954bf878765907a04c6fbc2dcd3f 100644
--- a/core/phpstan-baseline.neon
+++ b/core/phpstan-baseline.neon
@@ -745,14 +745,6 @@ parameters:
 			count: 1
 			path: lib/Drupal/Core/Form/FormValidator.php
 
-		-
-			message: """
-				#^Call to deprecated function GuzzleHttp\\\\default_user_agent\\(\\)\\:
-				default_user_agent will be removed in guzzlehttp/guzzle\\:8\\.0\\. Use Utils\\:\\:defaultUserAgent instead\\.$#
-			"""
-			count: 1
-			path: lib/Drupal/Core/Http/ClientFactory.php
-
 		-
 			message: "#^Call to deprecated constant REQUEST_TIME\\: Deprecated in drupal\\:8\\.3\\.0 and is removed from drupal\\:11\\.0\\.0\\. Use \\\\Drupal\\:\\:time\\(\\)\\-\\>getRequestTime\\(\\); $#"
 			count: 4