diff --git a/.env b/.env
index d50cb4e6..8d2460a8 100644
--- a/.env
+++ b/.env
@@ -29,7 +29,7 @@ LOCK_DSN=flock
 ###< symfony/lock ###
 
 ###> symfony/mailer ###
-# MAILER_DSN=null://null
+MAILER_DSN=null://null
 ###< symfony/mailer ###
 
 ###> doctrine/phpcr-bundle ###
diff --git a/.github/workflows/test-application.yaml b/.github/workflows/test-application.yaml
index 0d9a5f37..49543f82 100644
--- a/.github/workflows/test-application.yaml
+++ b/.github/workflows/test-application.yaml
@@ -39,7 +39,7 @@ jobs:
                           DATABASE_URL: "mysql://root:@127.0.0.1:3306/sulu_test?serverVersion=5.7"
 
                     - php-version: '8.3'
-                      node-version: '18'
+                      node-version: '20'
                       npm-version: '9'
                       mysql-version: '8.0'
                       create-project: true
@@ -55,8 +55,8 @@ jobs:
                           SULU_ADMIN_EMAIL:
                           DATABASE_URL: "mysql://root:@127.0.0.1:3306/sulu_test?serverVersion=8.0"
 
-                    - php-version: '8.3'
-                      node-version: '20'
+                    - php-version: '8.4'
+                      node-version: '22'
                       npm-version: '10'
                       mysql-version: '8.0'
                       create-project: true
@@ -71,6 +71,7 @@ jobs:
                           MAILER_URL: null://localhost
                           SULU_ADMIN_EMAIL:
                           DATABASE_URL: "mysql://root:@127.0.0.1:3306/sulu_test?serverVersion=8.0"
+                          PHP_CS_FIXER_IGNORE_ENV: true # remove when php cs fixer add support for PHP 8.4
 
         services:
             mysql:
diff --git a/composer.json b/composer.json
index 074bd837..ef655381 100644
--- a/composer.json
+++ b/composer.json
@@ -41,7 +41,7 @@
         "scheb/2fa-email": "^7.2",
         "scheb/2fa-trusted-device": "^7.2",
         "stof/doctrine-extensions-bundle": "^1.11",
-        "sulu/sulu": "2.6.*@dev",
+        "sulu/sulu": "2.6.x-dev",
         "symfony/config": "^7.1",
         "symfony/dotenv": "^7.1",
         "symfony/flex": "^1.17 || ^2.0",
diff --git a/symfony.lock b/symfony.lock
index 34fbb586..799cd8f9 100644
--- a/symfony.lock
+++ b/symfony.lock
@@ -248,7 +248,7 @@
             "repo": "github.com/symfony/recipes",
             "branch": "main",
             "version": "4.3",
-            "ref": "df66ee1f226c46f01e85c29c2f7acce0596ba35a"
+            "ref": "09051cfde49476e3c12cd3a0e44289ace1c75a4f"
         },
         "files": [
             "config/packages/mailer.yaml"