diff --git a/_build/build.php b/_build/build.php
index be2fb062a77..454553d459e 100755
--- a/_build/build.php
+++ b/_build/build.php
@@ -20,7 +20,7 @@
 
         $outputDir = __DIR__.'/output';
         $buildConfig = (new BuildConfig())
-            ->setSymfonyVersion('5.4')
+            ->setSymfonyVersion('6.4')
             ->setContentDir(__DIR__.'/..')
             ->setOutputDir($outputDir)
             ->setImagesDir(__DIR__.'/output/_images')