diff --git a/config/set/contentrepository-90.php b/config/set/contentrepository-90.php
index a1a6ee8..743acbf 100644
--- a/config/set/contentrepository-90.php
+++ b/config/set/contentrepository-90.php
@@ -123,7 +123,7 @@
         \Neos\ContentRepository\Domain\Model\NodeType::class => \Neos\ContentRepository\Core\NodeType\NodeType::class,
         \Neos\ContentRepository\Domain\Service\NodeTypeManager::class => \Neos\ContentRepository\Core\NodeType\NodeTypeManager::class,
 
-        \Neos\ContentRepository\Domain\Model\Workspace::class => \Neos\ContentRepository\Core\Projection\Workspace\Workspace::class,
+        \Neos\ContentRepository\Domain\Model\Workspace::class => \Neos\ContentRepository\Core\SharedModel\Workspace\Workspace::class,
         \Neos\ContentRepository\Domain\NodeAggregate\NodeAggregateIdentifier::class => \Neos\ContentRepository\Core\SharedModel\Node\NodeAggregateId::class,
         \Neos\ContentRepository\Domain\NodeAggregate\NodeName::class => \Neos\ContentRepository\Core\SharedModel\Node\NodeName::class,
         \Neos\ContentRepository\Domain\NodeType\NodeTypeName::class => \Neos\ContentRepository\Core\NodeType\NodeTypeName::class,
@@ -695,6 +695,42 @@
      */
     $rectorConfig->rule(FusionFlowQueryContextRector::class);
 
+    /**
+     * \Neos\ContentRepository\Domain\Model\Workspace
+     */
+    // getBaseWorkspace(): Workspace|null
+    //->baseworkspaceName
+    // getBaseWorkspaces(): Workspace[]
+    // ->
+    // getDescription(): null|string
+    // workspaceService->getWorkspaceMetadata->description->value
+    // getName(): string
+    // ->name
+    // getNodeCount(): int
+    $methodCallToWarningComments[] = new MethodCallToWarningComment(\Neos\ContentRepository\Domain\Model\Workspace::class, 'getNodeCount', '!! Workspace::getNodeCount() has been removed in Neos 9.0 without a replacement.');
+    // getOwner(): UserInterface|null
+    // getRootNodeData(): NodeData
+    $methodCallToWarningComments[] = new MethodCallToWarningComment(\Neos\ContentRepository\Domain\Model\Workspace::class, 'getRootNodeData', '!! Workspace::getRootNodeData() has been removed in Neos 9.0 without a replacement.');
+    // getTitle(): string
+    // meta->setWorkspaceTitle
+    // isInternalWorkspace(): bool
+    $methodCallToWarningComments[] = new MethodCallToWarningComment(\Neos\ContentRepository\Domain\Model\Workspace::class, 'isInternalWorkspace', '!! Workspace::isInternalWorkspace() has been removed in Neos 9.0. Please use the new Workspace permission api instead. See ContentRepositoryAuthorizationService::getWorkspacePermissions()');
+    // isPersonalWorkspace(): bool
+    $methodCallToWarningComments[] = new MethodCallToWarningComment(\Neos\ContentRepository\Domain\Model\Workspace::class, 'isPersonalWorkspace', '!! Workspace::isPersonalWorkspace() has been removed in Neos 9.0. Please use the new Workspace permission api instead. See ContentRepositoryAuthorizationService::getWorkspacePermissions()');
+    // isPrivateWorkspace(): bool
+    $methodCallToWarningComments[] = new MethodCallToWarningComment(\Neos\ContentRepository\Domain\Model\Workspace::class, 'isPrivateWorkspace', '!! Workspace::isPrivateWorkspace() has been removed in Neos 9.0. Please use the new Workspace permission api instead. See ContentRepositoryAuthorizationService::getWorkspacePermissions()');
+    // isPublicWorkspace(): bool
+    $methodCallToWarningComments[] = new MethodCallToWarningComment(\Neos\ContentRepository\Domain\Model\Workspace::class, 'isPublicWorkspace', '!! Workspace::isPublicWorkspace() has been removed in Neos 9.0. Please use the new Workspace permission api instead. See ContentRepositoryAuthorizationService::getWorkspacePermissions()');
+    // publish(targetWorkspace: Workspace): void
+    // publishNode(nodeToPublish: NodeInterface, targetWorkspace: Workspace): void
+    // publishNodes(nodes: NodeInterface[], targetWorkspace: Workspace): void
+    // setBaseWorkspace(baseWorkspace: Workspace): void
+    // setDescription(description: string): void
+    // workspaceService->setWorkspaceDescription
+    // setOwner(user: UserInterface|null|string): void
+    // setTitle(title: string): void
+    // workspaceService->setWorkspaceTitle
+
     /**
      * SPECIAL rules
      */
diff --git a/tests/Sets/ContentRepository90/Fixture/Signals/Workspace.php.inc b/tests/Sets/ContentRepository90/Fixture/Signals/Workspace.php.inc
index 6969765..e75214c 100644
--- a/tests/Sets/ContentRepository90/Fixture/Signals/Workspace.php.inc
+++ b/tests/Sets/ContentRepository90/Fixture/Signals/Workspace.php.inc
@@ -46,12 +46,12 @@ class Package extends BasePackage
         // TODO 9.0 migration: The signal "baseWorkspaceChanged" on "Workspace" has been removed. Please check https://docs.neos.io/api/upgrade-instructions/9/signals-and-slots for further information, how to replace a signal.
 
 
-        $dispatcher->connect(\Neos\ContentRepository\Core\Projection\Workspace\Workspace::class, 'baseWorkspaceChanged', function () { return 'foo'; });
+        $dispatcher->connect(\Neos\ContentRepository\Core\SharedModel\Workspace\Workspace::class, 'baseWorkspaceChanged', function () { return 'foo'; });
         // TODO 9.0 migration: The signal "beforeNodePublishing" on "Workspace" has been removed. Please check https://docs.neos.io/api/upgrade-instructions/9/signals-and-slots for further information, how to replace a signal.
 
         $dispatcher->connect('Neos\ContentRepository\Domain\Model\Workspace', 'beforeNodePublishing', RouterCachingService::class, 'flushCaches');
         // TODO 9.0 migration: The signal "afterNodePublishing" on "Workspace" has been removed. Please check https://docs.neos.io/api/upgrade-instructions/9/signals-and-slots for further information, how to replace a signal.
 
-        $dispatcher->connect(\Neos\ContentRepository\Core\Projection\Workspace\Workspace::class, 'afterNodePublishing', function () { return 'foo'; });
+        $dispatcher->connect(\Neos\ContentRepository\Core\SharedModel\Workspace\Workspace::class, 'afterNodePublishing', function () { return 'foo'; });
     }
 }
diff --git a/tests/Sets/ContentRepository90/Fixture/workspace.php.inc b/tests/Sets/ContentRepository90/Fixture/workspace.php.inc
new file mode 100644
index 0000000..e71baba
--- /dev/null
+++ b/tests/Sets/ContentRepository90/Fixture/workspace.php.inc
@@ -0,0 +1,127 @@
+<?php
+
+namespace Neos\Rector\Test;
+
+use Neos\Flow\Annotations as Flow;
+use Neos\ContentRepository\Domain\Model\Workspace;
+
+class SomeClass extends AnotherClass
+{
+
+    public function test(Workspace $workspace)
+    {
+        $baseWorkspace = $workspace->getBaseWorkspace();
+
+        $baseWorkspaces = $workspace->getBaseWorkspaces();
+
+        $title = $workspace->getTitle();
+
+        $description = $workspace->getDescription();
+
+        $name = $workspace->getName();
+
+        $workspace->getNodeCount();
+
+        $workspace->getOwner();
+
+        $workspace->getRootNodeData();
+
+        $workspace->isInternalWorkspace();
+
+        $workspace->isPersonalWorkspace();
+
+        $workspace->isPrivateWorkspace();
+
+        $workspace->isPublicWorkspace();
+
+        $workspace->publish($targetWorkspace);
+
+        $workspace->publishNode($node, $targetWorkspace);
+
+        $workspace->publishNodes([$node], $targetWorkspace);
+
+        $workspace->setBaseWorkspace($baseWorkspace);
+
+        $workspace->setOwner($user);
+
+        $workspace->setDescription("description");
+
+        $workspace->setTitle("title");
+    }
+}
+-----
+
+
+namespace Neos\Rector\Test;
+
+use Neos\Flow\Annotations as Flow;
+
+class SomeClass extends AnotherClass
+{
+    #[Flow\Inject]
+    protected \Neos\Neos\Domain\Service\WorkspaceService $workspaceService;
+    #[Flow\Inject]
+    protected \Neos\ContentRepositoryRegistry\ContentRepositoryRegistry $contentRepositoryRegistry;
+    #[Flow\Inject]
+    protected \Neos\Neos\Domain\Service\WorkspacePublishingService $workspacePublishingService;
+
+    public function test(\Neos\ContentRepository\Core\SharedModel\Workspace\Workspace $workspace)
+    {
+
+        $contentRepository = $this->contentRepositoryRegistry->get(\Neos\ContentRepository\Core\SharedModel\ContentRepository\ContentRepositoryId::fromString('default'));
+        $baseWorkspace = $contentRepository->findWorkspaceByName($workspace->baseWorkspaceName);
+
+        $contentRepository = $this->contentRepositoryRegistry->get(\Neos\ContentRepository\Core\SharedModel\ContentRepository\ContentRepositoryId::fromString('default'));
+        $baseWorkspaces = $contentRepository->findWorkspaces()->getBaseWorkspaces($workspace->baseWorkspaceName);
+
+        $title = $this->workspaceService->getWorkspaceMetadata(\Neos\ContentRepository\Core\SharedModel\ContentRepository\ContentRepositoryId::fromString('default'), $workspace->workspaceName)->title;
+
+        $description = $this->workspaceService->getWorkspaceMetadata(\Neos\ContentRepository\Core\SharedModel\ContentRepository\ContentRepositoryId::fromString('default'), $workspace->workspaceName)->description;
+        // TODO 9.0 migration: Check if you could change your code to work with the WorkspaceName value object instead.
+
+
+        $name = $workspace->workspaceName->value;
+        // TODO 9.0 migration: !! Workspace::getNodeCount() has been removed in Neos 9.0 without a replacement.
+
+
+        $workspace->getNodeCount();
+
+        $workspace->getOwner();
+        // TODO 9.0 migration: !! Workspace::getRootNodeData() has been removed in Neos 9.0 without a replacement.
+
+
+        $workspace->getRootNodeData();
+        // TODO 9.0 migration: !! Workspace::isInternalWorkspace() has been removed in Neos 9.0. Please use the new Workspace permission api instead. See ContentRepositoryAuthorizationService::getWorkspacePermissions()
+
+
+        $workspace->isInternalWorkspace();
+        // TODO 9.0 migration: !! Workspace::isPersonalWorkspace() has been removed in Neos 9.0. Please use the new Workspace permission api instead. See ContentRepositoryAuthorizationService::getWorkspacePermissions()
+
+
+        $workspace->isPersonalWorkspace();
+        // TODO 9.0 migration: !! Workspace::isPrivateWorkspace() has been removed in Neos 9.0. Please use the new Workspace permission api instead. See ContentRepositoryAuthorizationService::getWorkspacePermissions()
+
+
+        $workspace->isPrivateWorkspace();
+        // TODO 9.0 migration: !! Workspace::isPublicWorkspace() has been removed in Neos 9.0. Please use the new Workspace permission api instead. See ContentRepositoryAuthorizationService::getWorkspacePermissions()
+
+
+        $workspace->isPublicWorkspace();
+
+        $this->workspacePublishingService->publishWorkspace(\Neos\ContentRepository\Core\SharedModel\ContentRepository\ContentRepositoryId::fromString('default'), $workspace->workspaceName);
+
+        // TODO: Check if this matches your requirements as this is not a 100% replacement
+        $this->workspacePublishingService->publishChangesInDocument(\Neos\ContentRepository\Core\SharedModel\ContentRepository\ContentRepositoryId::fromString('default'), $workspace->workspaceName, $node);
+
+        // TODO: Use the \Neos\Neos\Domain\Service\WorkspacePublishingService to publish a workspace or changesin a document.
+        $workspace->publishNodes([$node], $targetWorkspace);
+
+
+        $workspace->setBaseWorkspace($baseWorkspace);
+        $workspace->setOwner($user);
+
+        $this->workspaceService->setWorkspaceDescription(\Neos\ContentRepository\Core\SharedModel\ContentRepository\ContentRepositoryId::fromString('default'), $workspace->workspaceName, 'description');
+
+        $this->workspaceService->setWorkspaceTitle(\Neos\ContentRepository\Core\SharedModel\ContentRepository\ContentRepositoryId::fromString('default'), $workspace->workspaceName, 'title');
+    }
+}