diff --git a/cache.rst b/cache.rst
index fb5cca97d57..a06cd0bd4c3 100644
--- a/cache.rst
+++ b/cache.rst
@@ -567,9 +567,6 @@ to enable this feature. This could be added by using the following configuration
     .. code-block:: php
 
         // config/packages/cache.php
-        use Symfony\Component\Cache\Adapter\ChainAdapter;
-        use Symfony\Component\DependencyInjection\Reference;
-
         $container->loadFromExtension('framework', [
             'cache' => [
                 'pools' => [
diff --git a/reference/configuration/swiftmailer.rst b/reference/configuration/swiftmailer.rst
index ed0c28736ab..674cee6ae53 100644
--- a/reference/configuration/swiftmailer.rst
+++ b/reference/configuration/swiftmailer.rst
@@ -381,7 +381,6 @@ alternatives based on the :ref:`service binding <services-binding>` feature:
         // config/services.php
         use App\Some\Service;
         use Psr\Log\LoggerInterface;
-        use Symfony\Component\DependencyInjection\Reference;
 
 
         $container->register(Service::class)
diff --git a/service_container.rst b/service_container.rst
index d918f590f7f..f551beb9a9a 100644
--- a/service_container.rst
+++ b/service_container.rst
@@ -483,7 +483,7 @@ all their types (string, boolean, array, binary and PHP constant parameters).
 However, there is another type of parameter related to services. In YAML config,
 any string which starts with ``@`` is considered as the ID of a service, instead
 of a regular string. In XML config, use the ``type="service"`` type for the
-parameter and in PHP config use the ``Reference`` class:
+parameter and in PHP config use the ``ref`` function:
 
 .. configuration-block::