diff --git a/contributing/code/tests.rst b/contributing/code/tests.rst
index 8bffc4aa4bc..e6af1170e3d 100644
--- a/contributing/code/tests.rst
+++ b/contributing/code/tests.rst
@@ -32,7 +32,7 @@ tests, such as Doctrine, Twig and Monolog. To do so,
 
     .. code-block:: terminal
 
-        $ COMPOSER_ROOT_VERSION=5.4.x-dev composer update
+        $ COMPOSER_ROOT_VERSION=6.4.x-dev composer update
 
 .. _running: