diff --git a/umzugsliste.php b/umzugsliste.php
index 2f65231..6cb62e3 100644
--- a/umzugsliste.php
+++ b/umzugsliste.php
@@ -53,6 +53,13 @@ class Umzugsliste {
 		require_once UMZUGSLISTE_PLUGIN_DIR . 'includes/class-cpt.php';
 		require_once UMZUGSLISTE_PLUGIN_DIR . 'includes/class-admin-menu.php';
 		require_once UMZUGSLISTE_PLUGIN_DIR . 'includes/class-settings.php';
+		require_once UMZUGSLISTE_PLUGIN_DIR . 'includes/class-furniture-data.php';
+		require_once UMZUGSLISTE_PLUGIN_DIR . 'includes/class-date-helpers.php';
+		require_once UMZUGSLISTE_PLUGIN_DIR . 'includes/class-captcha.php';
+		require_once UMZUGSLISTE_PLUGIN_DIR . 'includes/class-form-renderer.php';
+		require_once UMZUGSLISTE_PLUGIN_DIR . 'includes/class-shortcode.php';
+		require_once UMZUGSLISTE_PLUGIN_DIR . 'includes/class-email-generator.php';
+		require_once UMZUGSLISTE_PLUGIN_DIR . 'includes/class-form-handler.php';
 	}
 
 	/**
@@ -77,6 +84,12 @@ class Umzugsliste {
 
 		// Initialize settings
 		Umzugsliste_Settings::get_instance();
+
+		// Initialize shortcode
+		Umzugsliste_Shortcode::get_instance();
+
+		// Initialize form handler
+		Umzugsliste_Form_Handler::get_instance();
 	}
 }