diff --git a/Classes/Domain/Model/Author.php b/Classes/Domain/Model/Author.php
index 42cef9d..993ad92 100644
--- a/Classes/Domain/Model/Author.php
+++ b/Classes/Domain/Model/Author.php
@@ -17,16 +17,15 @@
 
 use TYPO3\CMS\Extbase\Annotation as Extbase;
 use TYPO3\CMS\Extbase\DomainObject\AbstractEntity;
-use TYPO3\CMS\Extbase\Persistence\Generic\LazyObjectStorage;
 use TYPO3\CMS\Extbase\Persistence\ObjectStorage;
 
 class Author extends AbstractEntity
 {
     /**
-     * @var ObjectStorage|LazyObjectStorage<Book>
+     * @var ObjectStorage<Book>
      */
     #[Extbase\ORM\Lazy]
-    protected ObjectStorage|LazyObjectStorage $books;
+    protected ObjectStorage $books;
 
     protected string $lastname = '';
 
diff --git a/Classes/Domain/Model/Book.php b/Classes/Domain/Model/Book.php
index 1eb19e8..91ebc3d 100644
--- a/Classes/Domain/Model/Book.php
+++ b/Classes/Domain/Model/Book.php
@@ -18,28 +18,27 @@
 use TYPO3\CMS\Extbase\Annotation as Extbase;
 use TYPO3\CMS\Extbase\Domain\Model\FileReference;
 use TYPO3\CMS\Extbase\DomainObject\AbstractEntity;
-use TYPO3\CMS\Extbase\Persistence\Generic\LazyObjectStorage;
 use TYPO3\CMS\Extbase\Persistence\ObjectStorage;
 
 class Book extends AbstractEntity
 {
     /**
-     * @var ObjectStorage|LazyObjectStorage<Author>
+     * @var ObjectStorage<Author>
      */
     #[Extbase\ORM\Lazy]
-    protected ObjectStorage|LazyObjectStorage $author;
+    protected ObjectStorage $author;
 
     /**
-     * @var ObjectStorage|LazyObjectStorage<Category>
+     * @var ObjectStorage<Category>
      */
     #[Extbase\ORM\Lazy]
-    protected ObjectStorage|LazyObjectStorage $category;
+    protected ObjectStorage $category;
 
     /**
-     * @var ObjectStorage|LazyObjectStorage<Extras>
+     * @var ObjectStorage<Extras>
      */
     #[Extbase\ORM\Lazy]
-    protected ObjectStorage|LazyObjectStorage $extras;
+    protected ObjectStorage $extras;
 
     /**
      * @var ObjectStorage<FileReference>
diff --git a/Classes/Domain/Model/Category.php b/Classes/Domain/Model/Category.php
index 22dd682..bfb11e3 100644
--- a/Classes/Domain/Model/Category.php
+++ b/Classes/Domain/Model/Category.php
@@ -18,25 +18,24 @@
 use TYPO3\CMS\Extbase\Annotation as Extbase;
 use TYPO3\CMS\Extbase\DomainObject\AbstractEntity;
 use TYPO3\CMS\Extbase\Persistence\Generic\LazyLoadingProxy;
-use TYPO3\CMS\Extbase\Persistence\Generic\LazyObjectStorage;
 use TYPO3\CMS\Extbase\Persistence\ObjectStorage;
 
 class Category extends AbstractEntity
 {
     /**
-     * @var ObjectStorage|LazyObjectStorage<Category>
+     * @var ObjectStorage<Category>
      */
     #[Extbase\ORM\Lazy]
-    protected ObjectStorage|LazyObjectStorage $children;
+    protected ObjectStorage $children;
 
     /**
-     * @var ObjectStorage|LazyObjectStorage<Book>
+     * @var ObjectStorage<Book>
      */
     #[Extbase\ORM\Lazy]
-    protected ObjectStorage|LazyObjectStorage $books;
+    protected ObjectStorage $books;
 
     #[Extbase\ORM\Lazy]
-    protected null|LazyLoadingProxy|Category $parent = null;
+    protected Category|LazyLoadingProxy|null $parent = null;
 
     protected string $title = '';
 
diff --git a/Classes/Domain/Model/Extras.php b/Classes/Domain/Model/Extras.php
index 811222e..d8f901a 100644
--- a/Classes/Domain/Model/Extras.php
+++ b/Classes/Domain/Model/Extras.php
@@ -22,7 +22,7 @@
 class Extras extends AbstractEntity
 {
     #[Extbase\ORM\Lazy]
-    protected null|LazyLoadingProxy|ExtrasLabels $label = null;
+    protected ExtrasLabels|LazyLoadingProxy|null $label = null;
 
     protected int $type = 0;
 
diff --git a/Classes/Domain/Model/Series.php b/Classes/Domain/Model/Series.php
index 73dd229..5ece580 100644
--- a/Classes/Domain/Model/Series.php
+++ b/Classes/Domain/Model/Series.php
@@ -17,16 +17,15 @@
 
 use TYPO3\CMS\Extbase\Annotation as Extbase;
 use TYPO3\CMS\Extbase\DomainObject\AbstractEntity;
-use TYPO3\CMS\Extbase\Persistence\Generic\LazyObjectStorage;
 use TYPO3\CMS\Extbase\Persistence\ObjectStorage;
 
 class Series extends AbstractEntity
 {
     /**
-     * @var ObjectStorage|LazyObjectStorage<Book>
+     * @var ObjectStorage<Book>
      */
     #[Extbase\ORM\Lazy]
-    protected ObjectStorage|LazyObjectStorage $books;
+    protected ObjectStorage $books;
 
     protected string $title = '';
 
diff --git a/Documentation/guides.xml b/Documentation/guides.xml
index 3b6ed80..17bc27b 100644
--- a/Documentation/guides.xml
+++ b/Documentation/guides.xml
@@ -16,8 +16,8 @@
                interlink-shortcode="evoweb/sf-books"
     />
     <project title="sf_books"
-             release="8.1.0"
-             version="8.1.0"
+             release="8.1.1"
+             version="8.1.1"
              copyright="since 2004 by evoWeb"
     />
     <inventory id="t3tsref" url="https://docs.typo3.org/m/typo3/reference-typoscript/main/en-us/"/>
diff --git a/ext_emconf.php b/ext_emconf.php
index 3d9cb6b..e4e138d 100644
--- a/ext_emconf.php
+++ b/ext_emconf.php
@@ -10,7 +10,7 @@
     'author_email' => 'typo3@evoweb.de',
     'author_company' => 'evoWeb',
     'state' => 'stable',
-    'version' => '8.1.0',
+    'version' => '8.1.1',
     'constraints' => [
         'depends' => [
             'typo3' => '12.0.0-13.4.99',