diff --git a/core/modules/workspaces/src/Entity/Workspace.php b/core/modules/workspaces/src/Entity/Workspace.php
index da1eecec75269924a57259b4eee785702907eedc..3236e3ccbcad0f0fe0eaa0e8814688a27d908c41 100644
--- a/core/modules/workspaces/src/Entity/Workspace.php
+++ b/core/modules/workspaces/src/Entity/Workspace.php
@@ -130,14 +130,6 @@ public function publish() {
     return \Drupal::service('workspaces.operation_factory')->getPublisher($this)->publish();
   }
 
-  /**
-   * {@inheritdoc}
-   */
-  public function isDefaultWorkspace() {
-    @trigger_error('WorkspaceInterface::isDefaultWorkspace() is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. Use \Drupal\workspaces\WorkspaceManager::hasActiveWorkspace() instead. See https://www.drupal.org/node/3071527', E_USER_DEPRECATED);
-    return FALSE;
-  }
-
   /**
    * {@inheritdoc}
    */
@@ -193,18 +185,4 @@ public static function postDelete(EntityStorageInterface $storage, array $entiti
     \Drupal::service('workspaces.manager')->purgeDeletedWorkspacesBatch();
   }
 
-  /**
-   * Default value callback for 'uid' base field definition.
-   *
-   * @deprecated The ::getCurrentUserId method is deprecated in 8.6.x and will
-   *   be removed before 9.0.0.
-   *
-   * @return int[]
-   *   An array containing the ID of the current user.
-   */
-  public static function getCurrentUserId() {
-    @trigger_error('The ::getCurrentUserId method is deprecated in 8.6.x and will be removed before 9.0.0.', E_USER_DEPRECATED);
-    return [\Drupal::currentUser()->id()];
-  }
-
 }
diff --git a/core/modules/workspaces/src/WorkspaceInterface.php b/core/modules/workspaces/src/WorkspaceInterface.php
index 5e0d2d3ebdd6a14871d5b1869f3c949f7df9d862..f62a1776e4f462f2d8b78e5cb59358f97de2cf1c 100644
--- a/core/modules/workspaces/src/WorkspaceInterface.php
+++ b/core/modules/workspaces/src/WorkspaceInterface.php
@@ -11,34 +11,11 @@
  */
 interface WorkspaceInterface extends ContentEntityInterface, EntityChangedInterface, EntityOwnerInterface {
 
-  /**
-   * The ID of the default workspace.
-   *
-   * @deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. Use
-   *   \Drupal\workspaces\WorkspaceManager::hasActiveWorkspace() instead.
-   *
-   * @see https://www.drupal.org/node/3071527
-   */
-  const DEFAULT_WORKSPACE = 'live';
-
   /**
    * Publishes the contents of this workspace to the default (Live) workspace.
    */
   public function publish();
 
-  /**
-   * Determines whether the workspace is the default one or not.
-   *
-   * @return bool
-   *   TRUE if this workspace is the default one (e.g 'Live'), FALSE otherwise.
-   *
-   * @deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. Use
-   *   \Drupal\workspaces\WorkspaceManager::hasActiveWorkspace() instead.
-   *
-   * @see https://www.drupal.org/node/3071527
-   */
-  public function isDefaultWorkspace();
-
   /**
    * Gets the workspace creation timestamp.
    *