core/core.services.yml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/core/core.services.yml b/core/core.services.yml
index ed1341c..f276733 100644
--- a/core/core.services.yml
+++ b/core/core.services.yml
@@ -1495,6 +1495,7 @@ services:
   render_cache:
     class: Drupal\Core\Render\RenderCache
     arguments: ['@request_stack', '@cache_factory', '@cache_contexts_manager']
+    public: false  # Private to 'renderer'.
   renderer:
     class: Drupal\Core\Render\Renderer
     arguments: ['@controller_resolver', '@theme.manager', '@plugin.manager.element_info', '@render_cache', '@request_stack', '%renderer.config%']