diff --git a/tests/src/Functional/SchedulerBrowserTestBase.php b/tests/src/Functional/SchedulerBrowserTestBase.php
index c4c3ed1..8b1fb84 100644
--- a/tests/src/Functional/SchedulerBrowserTestBase.php
+++ b/tests/src/Functional/SchedulerBrowserTestBase.php
@@ -45,6 +45,21 @@ abstract class SchedulerBrowserTestBase extends BrowserTestBase {
    */
   protected $defaultTheme = 'stark';

+  /**
+   * Strict schema checking.
+   *
+   * The EntityReferenceArgument `entity_target_id` views argument plugin was
+   * introduced in Drupal 10.3 but not back-ported. This throws a schema error
+   * in earlier versions during tests (but not in actual live sites) so we need
+   * to remove the schema validation for versions earlier than 10.3.
+   *
+   * @var bool
+   *
+   * @see https://www.drupal.org/project/drupal/issues/2640994
+   * @see https://www.drupal.org/project/scheduler/issues/3451750
+   */
+  protected $strictConfigSchema = FALSE;
+
   /**
    * {@inheritdoc}
    */
diff --git a/tests/src/FunctionalJavascript/SchedulerJavascriptTestBase.php b/tests/src/FunctionalJavascript/SchedulerJavascriptTestBase.php
index f4f86b2..d1662a8 100644
--- a/tests/src/FunctionalJavascript/SchedulerJavascriptTestBase.php
+++ b/tests/src/FunctionalJavascript/SchedulerJavascriptTestBase.php
@@ -49,6 +49,21 @@ abstract class SchedulerJavascriptTestBase extends WebDriverTestBase {
    */
   protected $defaultTheme = 'claro';

+  /**
+   * Strict schema checking.
+   *
+   * The EntityReferenceArgument `entity_target_id` views argument plugin was
+   * introduced in Drupal 10.3 but not back-ported. This throws a schema error
+   * in earlier versions during tests (but not in actual live sites) so we need
+   * to remove the schema validation for versions earlier than 10.3.
+   *
+   * @var bool
+   *
+   * @see https://www.drupal.org/project/drupal/issues/2640994
+   * @see https://www.drupal.org/project/scheduler/issues/3451750
+   */
+  protected $strictConfigSchema = FALSE;
+
   /**
    * {@inheritdoc}
    */
diff --git a/tests/src/Kernel/MigrateSchedulerTestBase.php b/tests/src/Kernel/MigrateSchedulerTestBase.php
index 419b508..45da703 100644
--- a/tests/src/Kernel/MigrateSchedulerTestBase.php
+++ b/tests/src/Kernel/MigrateSchedulerTestBase.php
@@ -19,4 +19,19 @@ abstract class MigrateSchedulerTestBase extends MigrateDrupal7TestBase {
     'views',
   ];

+  /**
+   * Strict schema checking.
+   *
+   * The EntityReferenceArgument `entity_target_id` views argument plugin was
+   * introduced in Drupal 10.3 but not back-ported. This throws a schema error
+   * in earlier versions during tests (but not in actual live sites) so we need
+   * to remove the schema validation for versions earlier than 10.3.
+   *
+   * @var bool
+   *
+   * @see https://www.drupal.org/project/drupal/issues/2640994
+   * @see https://www.drupal.org/project/scheduler/issues/3451750
+   */
+  protected $strictConfigSchema = FALSE;
+
 }