diff --git a/tests/modules/scheduler_api_test/scheduler_api_test.install b/tests/modules/scheduler_api_test/scheduler_api_test.install
index c57c7c1..965f621 100644
--- a/tests/modules/scheduler_api_test/scheduler_api_test.install
+++ b/tests/modules/scheduler_api_test/scheduler_api_test.install
@@ -16,7 +16,7 @@
 function scheduler_api_test_uninstall() {
 
   // Delete any content that may have been created for the custom node type.
-  $nids_query = db_select('node', 'n')
+  $nids_query = \Drupal::database()->select('node', 'n')
     ->fields('n', ['nid'])
     ->condition('n.type', ['scheduler_api_test'], 'IN')
     ->execute();
diff --git a/tests/src/Functional/SchedulerBasicTest.php b/tests/src/Functional/SchedulerBasicTest.php
index 2904bfb..3fea8e4 100644
--- a/tests/src/Functional/SchedulerBasicTest.php
+++ b/tests/src/Functional/SchedulerBasicTest.php
@@ -72,8 +72,8 @@ class SchedulerBasicTest extends SchedulerBrowserTestBase {
 
     // Modify the scheduler field data to a time in the past, then run cron.
     // @TODO change this to node_save()
-    db_update('node_field_data')->fields([$key => time() - 1])->condition('nid', $node->id())->execute();
-    db_update('node_field_revision')->fields([$key => time() - 1])->condition('nid', $node->id())->execute();
+    \Drupal::database()->update('node_field_data')->fields([$key => time() - 1])->condition('nid', $node->id())->execute();
+    \Drupal::database()->update('node_field_revision')->fields([$key => time() - 1])->condition('nid', $node->id())->execute();
     $this->nodeStorage->resetCache([$node->id()]);
 
     $this->cronRun();
diff --git a/tests/src/Functional/SchedulerRevisioningTest.php b/tests/src/Functional/SchedulerRevisioningTest.php
index 1d85a59..2d1821f 100644
--- a/tests/src/Functional/SchedulerRevisioningTest.php
+++ b/tests/src/Functional/SchedulerRevisioningTest.php
@@ -50,7 +50,7 @@ class SchedulerRevisioningTest extends SchedulerBrowserTestBase {
    */
   protected function assertRevisionLogMessage($nid, $value, $message = '', $group = 'Other') {
     // Retrieve the latest revision log message for this node.
-    $log_message = db_select('node_revision', 'r')
+    $log_message = \Drupal::database()->select('node_revision', 'r')
       ->fields('r', ['revision_log'])
       ->condition('nid', $nid)
       ->orderBy('vid', 'DESC')
@@ -77,7 +77,7 @@ class SchedulerRevisioningTest extends SchedulerBrowserTestBase {
    *   TRUE if the assertion succeeded, FALSE otherwise.
    */
   protected function assertRevisionCount($nid, $value, $message = '', $group = 'Other') {
-    $count = db_select('node_revision', 'r')
+    $count = \Drupal::database()->select('node_revision', 'r')
       ->condition('nid', $nid)
       ->countQuery()
       ->execute()