diff --git a/files/lib/action/FaqSearchAction.class.php b/files/lib/action/FaqSearchAction.class.php
index c6bd041..7f1444a 100644
--- a/files/lib/action/FaqSearchAction.class.php
+++ b/files/lib/action/FaqSearchAction.class.php
@@ -11,7 +11,7 @@
 use wcf\http\Helper;
 use wcf\system\WCF;
 
-class FaqSearchAction implements RequestHandlerInterface
+final class FaqSearchAction implements RequestHandlerInterface
 {
     public function handle(ServerRequestInterface $request): ResponseInterface
     {
diff --git a/files/lib/data/faq/Question.class.php b/files/lib/data/faq/Question.class.php
index efd34f2..b832767 100644
--- a/files/lib/data/faq/Question.class.php
+++ b/files/lib/data/faq/Question.class.php
@@ -24,7 +24,7 @@
  * @property-read   int $hasEmbeddedObjects is `1` if the question has embedded objects, otherwise `0`
  * @property-read   int $isMultilingual
  */
-class Question extends DatabaseObject implements IRouteController, ISearchResultObject
+final class Question extends DatabaseObject implements IRouteController, ISearchResultObject
 {
     protected FaqCategory $category;
 
diff --git a/files/lib/data/faq/QuestionAction.class.php b/files/lib/data/faq/QuestionAction.class.php
index fef5009..6c76387 100644
--- a/files/lib/data/faq/QuestionAction.class.php
+++ b/files/lib/data/faq/QuestionAction.class.php
@@ -18,7 +18,7 @@
  * @method  QuestionEditor[] getObjects()
  * @method  QuestionEditor   getSingleObject()
  */
-class QuestionAction extends AbstractDatabaseObjectAction implements ISortableAction, IToggleAction
+final class QuestionAction extends AbstractDatabaseObjectAction implements ISortableAction, IToggleAction
 {
     use TDatabaseObjectToggle;
 
diff --git a/files/lib/data/faq/QuestionEditor.class.php b/files/lib/data/faq/QuestionEditor.class.php
index 1f156a0..148d8f7 100644
--- a/files/lib/data/faq/QuestionEditor.class.php
+++ b/files/lib/data/faq/QuestionEditor.class.php
@@ -10,7 +10,7 @@
  * @method      Question     getDecoratedObject()
  * @mixin       Question
  */
-class QuestionEditor extends DatabaseObjectEditor
+final class QuestionEditor extends DatabaseObjectEditor
 {
     /**
      * @inheritDoc
diff --git a/files/lib/data/faq/QuestionList.class.php b/files/lib/data/faq/QuestionList.class.php
index 5e04783..fd01f5d 100644
--- a/files/lib/data/faq/QuestionList.class.php
+++ b/files/lib/data/faq/QuestionList.class.php
@@ -12,7 +12,7 @@
  * @method  Question|null    search($objectID)
  * @property    Question[] $objects
  */
-class QuestionList extends DatabaseObjectList
+final class QuestionList extends DatabaseObjectList
 {
     /**
      * @inheritDoc
diff --git a/files/lib/data/faq/category/FaqCategory.class.php b/files/lib/data/faq/category/FaqCategory.class.php
index 68c99af..f9c37a5 100644
--- a/files/lib/data/faq/category/FaqCategory.class.php
+++ b/files/lib/data/faq/category/FaqCategory.class.php
@@ -17,7 +17,7 @@
  * @method      FaqCategory[]    getParentCategories()
  * @method static FaqCategory|null getCategory($categoryID)
  */
-class FaqCategory extends AbstractDecoratedCategory implements IAccessibleObject, ITitledLinkObject
+final class FaqCategory extends AbstractDecoratedCategory implements IAccessibleObject, ITitledLinkObject
 {
     public const OBJECT_TYPE_NAME = 'dev.tkirch.wsc.faq.category';
 
diff --git a/files/lib/data/faq/category/FaqCategoryNode.class.php b/files/lib/data/faq/category/FaqCategoryNode.class.php
index 30462fd..715bc63 100644
--- a/files/lib/data/faq/category/FaqCategoryNode.class.php
+++ b/files/lib/data/faq/category/FaqCategoryNode.class.php
@@ -8,7 +8,7 @@
  * @method  FaqCategory getDecoratedObject()
  * @mixin   FaqCategory
  */
-class FaqCategoryNode extends CategoryNode
+final class FaqCategoryNode extends CategoryNode
 {
     /**
      * @inheritDoc
diff --git a/files/lib/data/faq/category/FaqCategoryNodeTree.class.php b/files/lib/data/faq/category/FaqCategoryNodeTree.class.php
index a22fde2..c530a49 100644
--- a/files/lib/data/faq/category/FaqCategoryNodeTree.class.php
+++ b/files/lib/data/faq/category/FaqCategoryNodeTree.class.php
@@ -5,7 +5,7 @@
 use wcf\data\category\CategoryNode;
 use wcf\data\category\CategoryNodeTree;
 
-class FaqCategoryNodeTree extends CategoryNodeTree
+final class FaqCategoryNodeTree extends CategoryNodeTree
 {
     /**
      * @inheritDoc
diff --git a/files/lib/system/attachment/FaqQuestionAttachmentObjectType.class.php b/files/lib/system/attachment/FaqQuestionAttachmentObjectType.class.php
index 160674c..2c9efbe 100644
--- a/files/lib/system/attachment/FaqQuestionAttachmentObjectType.class.php
+++ b/files/lib/system/attachment/FaqQuestionAttachmentObjectType.class.php
@@ -4,7 +4,7 @@
 
 use wcf\system\WCF;
 
-class FaqQuestionAttachmentObjectType extends AbstractAttachmentObjectType
+final class FaqQuestionAttachmentObjectType extends AbstractAttachmentObjectType
 {
     /**
      * @inheritDoc
diff --git a/files/lib/system/bbcode/FaqBBCode.class.php b/files/lib/system/bbcode/FaqBBCode.class.php
index bd7d78e..5b2abdf 100644
--- a/files/lib/system/bbcode/FaqBBCode.class.php
+++ b/files/lib/system/bbcode/FaqBBCode.class.php
@@ -6,7 +6,7 @@
 use wcf\data\faq\Question;
 use wcf\system\WCF;
 
-class FaqBBCode extends AbstractBBCode
+final class FaqBBCode extends AbstractBBCode
 {
     /**
      * @inheritDoc
diff --git a/files/lib/system/category/FaqCategoryType.class.php b/files/lib/system/category/FaqCategoryType.class.php
index 880bca6..94c4aac 100644
--- a/files/lib/system/category/FaqCategoryType.class.php
+++ b/files/lib/system/category/FaqCategoryType.class.php
@@ -2,7 +2,7 @@
 
 namespace wcf\system\category;
 
-class FaqCategoryType extends AbstractCategoryType
+final class FaqCategoryType extends AbstractCategoryType
 {
     /**
      * @inheritDoc
diff --git a/files/lib/system/search/FaqQuestionSearch.class.php b/files/lib/system/search/FaqQuestionSearch.class.php
index 00296d2..db7ff3b 100644
--- a/files/lib/system/search/FaqQuestionSearch.class.php
+++ b/files/lib/system/search/FaqQuestionSearch.class.php
@@ -7,7 +7,7 @@
 use wcf\system\page\PageLocationManager;
 use wcf\system\WCF;
 
-class FaqQuestionSearch extends AbstractSearchProvider
+final class FaqQuestionSearch extends AbstractSearchProvider
 {
     protected array $faqCache = [];
 
diff --git a/files/lib/system/worker/FaqQuestionSearchIndexRebuildDataWorker.class.php b/files/lib/system/worker/FaqQuestionSearchIndexRebuildDataWorker.class.php
index d3ea918..006634c 100644
--- a/files/lib/system/worker/FaqQuestionSearchIndexRebuildDataWorker.class.php
+++ b/files/lib/system/worker/FaqQuestionSearchIndexRebuildDataWorker.class.php
@@ -7,7 +7,7 @@
 use wcf\data\language\item\LanguageItemList;
 use wcf\system\search\SearchIndexManager;
 
-class FaqQuestionSearchIndexRebuildDataWorker extends AbstractRebuildDataWorker
+final class FaqQuestionSearchIndexRebuildDataWorker extends AbstractRebuildDataWorker
 {
     /**
      * class name for DatabaseObjectList