diff --git a/classes/taskrunner.php b/classes/taskrunner.php
index c307fd5..265a7a0 100644
--- a/classes/taskrunner.php
+++ b/classes/taskrunner.php
@@ -18,7 +18,10 @@
 
 defined('MOODLE_INTERNAL') || die();
 
-require_once($CFG->libdir . '/cronlib.php');
+//pre Moodle 4.2 incl cronlib
+if($CFG->version<2023042400) {
+    require_once($CFG->libdir . '/cronlib.php');
+}
 
 /**
  *