diff --git a/packages/playground/data-liberation/bootstrap.php b/packages/playground/data-liberation/bootstrap.php
index dcfab2623f..091dcc4ec0 100644
--- a/packages/playground/data-liberation/bootstrap.php
+++ b/packages/playground/data-liberation/bootstrap.php
@@ -61,7 +61,6 @@
 
 require_once __DIR__ . '/src/entity-readers/WP_Entity_Reader.php';
 require_once __DIR__ . '/src/entity-readers/WP_HTML_Entity_Reader.php';
-require_once __DIR__ . '/src/entity-readers/WP_EPub_Entity_Reader.php';
 require_once __DIR__ . '/src/entity-readers/WP_WXR_Entity_Reader.php';
 require_once __DIR__ . '/src/entity-readers/WP_Directory_Tree_Entity_Reader.php';