diff --git a/tests/base_testcase.php b/tests/base_testcase.php
index 43802a2..cc79c0d 100644
--- a/tests/base_testcase.php
+++ b/tests/base_testcase.php
@@ -35,7 +35,7 @@ use auth_outage\local\outage;
  * @copyright  2016 Catalyst IT
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
-abstract class base_testcase extends \advanced_testcase {
+abstract class base_testcase extends \core_phpunit\testcase {
     /**
      * Checks PHPUnit version and calls the functions accordingly.
      * @param string $exception Expected exception class.
diff --git a/tests/calendar/calendar_test.php b/tests/calendar/calendar_test.php
index 9481256..bc55123 100644
--- a/tests/calendar/calendar_test.php
+++ b/tests/calendar/calendar_test.php
@@ -39,7 +39,7 @@ use auth_outage\local\outage;
  * @license         http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  * @covers          \auth_outage\calendar\calendar
  */
-class calendar_test extends \advanced_testcase {
+class calendar_test extends \core_phpunit\testcase {
     /**
      * @var outage|null The calendar entry owner.
      */
diff --git a/tests/dml/events_test.php b/tests/dml/events_test.php
index d2a9d85..c9f66df 100644
--- a/tests/dml/events_test.php
+++ b/tests/dml/events_test.php
@@ -39,7 +39,7 @@ use auth_outage\local\outage;
  * @license         http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  * @covers          \auth_outage\dml\outagedb
  */
-class events_test extends \advanced_testcase {
+class events_test extends \core_phpunit\testcase {
     /**
      * @var outage|null Outage used in the tests.
      */