diff --git a/.gitattributes b/.gitattributes
index 6c6b531..50bcb4d 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,20 +1,21 @@
-*                           text=auto
-/.ddev                      export-ignore
-/.github                    export-ignore
-/Build                      export-ignore
-/Tests                      export-ignore
-/.editorconfig              export-ignore
-/.gitattributes             export-ignore
-/.gitignore                 export-ignore
-/.php-cs-fixer.php          export-ignore
-/composer.lock              export-ignore
-/docker-compose.yml         export-ignore
-/packaging_exclude.php      export-ignore
-/phpstan.neon               export-ignore
-/phpstan-baseline.neon      export-ignore
-/phpunit.functional.xml     export-ignore
-/phpunit.unit.xml           export-ignore
-/rector.php                 export-ignore
-/renovate.json              export-ignore
-/typoscript-lint.yml        export-ignore
-/version-bumper.yaml        export-ignore
+*                                   text=auto
+/.ddev                              export-ignore
+/.github                            export-ignore
+/Build                              export-ignore
+/Tests                              export-ignore
+/.editorconfig                      export-ignore
+/.gitattributes                     export-ignore
+/.gitignore                         export-ignore
+/.php-cs-fixer.php                  export-ignore
+/composer.lock                      export-ignore
+/composer-dependency-analyser.php   export-ignore
+/docker-compose.yml                 export-ignore
+/packaging_exclude.php              export-ignore
+/phpstan.neon                       export-ignore
+/phpstan-baseline.neon              export-ignore
+/phpunit.functional.xml             export-ignore
+/phpunit.unit.xml                   export-ignore
+/rector.php                         export-ignore
+/renovate.json                      export-ignore
+/typoscript-lint.yml                export-ignore
+/version-bumper.yaml                export-ignore
diff --git a/Classes/ContentObject/CanUpdateRegister.php b/Classes/ContentObject/CanUpdateRegister.php
new file mode 100644
index 0000000..5fdfed8
--- /dev/null
+++ b/Classes/ContentObject/CanUpdateRegister.php
@@ -0,0 +1,72 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the TYPO3 CMS extension "handlebars_forms".
+ *
+ * It is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License, either version 2
+ * of the License, or any later version.
+ *
+ * For the full copyright and license information, please read the
+ * LICENSE.txt file that was distributed with this source code.
+ *
+ * The TYPO3 project - inspiring people to share!
+ */
+
+namespace CPSIT\Typo3HandlebarsForms\ContentObject;
+
+use Psr\Http\Message;
+use TYPO3\CMS\Core;
+use TYPO3\CMS\Frontend;
+
+/**
+ * CanUpdateRegister
+ *
+ * @author Elias Häußler <e.haeussler@familie-redlich.de>
+ * @license GPL-2.0-or-later
+ * @internal
+ *
+ * @property Message\ServerRequestInterface $request
+ */
+trait CanUpdateRegister
+{
+    protected Core\Information\Typo3Version $typo3Version;
+
+    protected function updateRegister(string $key, ?int $value = null): void
+    {
+        match ($this->typo3Version->getMajorVersion()) {
+            13 => $this->modifyRegisterUsingTsfe($key, $value),
+            14 => $this->modifyRegisterUsingRequest($key, $value),
+            default => null,
+        };
+    }
+
+    /**
+     * @todo Remove once support for TYPO3 v13 is dropped
+     */
+    protected function modifyRegisterUsingTsfe(string $key, ?int $value): void
+    {
+        $tsfe = $this->getTypoScriptFrontendController();
+
+        if ($value === null) {
+            unset($tsfe->register[$key]);
+        } else {
+            $tsfe->register[$key] = $value;
+        }
+    }
+
+    protected function modifyRegisterUsingRequest(string $key, ?int $value): void
+    {
+        $stack = $this->request->getAttribute('frontend.register.stack');
+
+        if (!($stack instanceof Frontend\ContentObject\RegisterStack)) {
+            return;
+        }
+
+        if ($value !== null) {
+            $stack->current()->set($key, $value);
+        }
+    }
+}
diff --git a/Classes/ContentObject/ChildrenContentObject.php b/Classes/ContentObject/ChildrenContentObject.php
index f7644d3..72ca5b4 100644
--- a/Classes/ContentObject/ChildrenContentObject.php
+++ b/Classes/ContentObject/ChildrenContentObject.php
@@ -19,6 +19,7 @@
 
 use CPSIT\Typo3HandlebarsForms\Domain;
 use Symfony\Component\DependencyInjection;
+use TYPO3\CMS\Core;
 
 /**
  * ChildrenContentObject
@@ -29,9 +30,16 @@
 #[DependencyInjection\Attribute\AutoconfigureTag('frontend.contentobject', ['identifier' => 'HBS_CHILDREN'])]
 final class ChildrenContentObject extends AbstractHandlebarsFormsContentObject
 {
+    use CanUpdateRegister;
+
     private const IDENTIFIER_COUNT = 'HBS_CHILDREN_COUNT';
     private const IDENTIFIER_CURRENT = 'HBS_CHILDREN_CURRENT';
 
+    public function __construct()
+    {
+        $this->typo3Version = new Core\Information\Typo3Version();
+    }
+
     /**
      * @return list<mixed>|null
      */
@@ -49,23 +57,21 @@ protected function resolve(array $configuration, Context\ValueResolutionContext
 
         $processedValue = [];
 
-        // Add children count to TSFE register
-        // @todo Use $this->request->getAttribute('frontend.register.stack') in TYPO3 v14
-        $tsfe = $this->getTypoScriptFrontendController();
-        $tsfe->register[self::IDENTIFIER_COUNT] = count($children);
+        // Add children count to register
+        $this->updateRegister(self::IDENTIFIER_COUNT, count($children));
 
         foreach ($children as $index => $childViewModel) {
             // Add current child index to TSFE register
-            $tsfe->register[self::IDENTIFIER_CURRENT] = $index;
+            $this->updateRegister(self::IDENTIFIER_CURRENT, count($children));
 
             try {
                 $processedValue[] = $context->process($configuration, viewModel: $childViewModel);
             } finally {
-                unset($tsfe->register[self::IDENTIFIER_CURRENT]);
+                $this->updateRegister(self::IDENTIFIER_CURRENT);
             }
         }
 
-        unset($tsfe->register[self::IDENTIFIER_COUNT]);
+        $this->updateRegister(self::IDENTIFIER_COUNT);
 
         return $processedValue;
     }
diff --git a/Classes/ContentObject/RenderablesContentObject.php b/Classes/ContentObject/RenderablesContentObject.php
index 3340938..15fd87f 100644
--- a/Classes/ContentObject/RenderablesContentObject.php
+++ b/Classes/ContentObject/RenderablesContentObject.php
@@ -19,6 +19,7 @@
 
 use CPSIT\Typo3HandlebarsForms\Domain;
 use Symfony\Component\DependencyInjection;
+use TYPO3\CMS\Core;
 use TYPO3\CMS\Fluid;
 use TYPO3\CMS\Form;
 
@@ -31,6 +32,8 @@
 #[DependencyInjection\Attribute\AutoconfigureTag('frontend.contentobject', ['identifier' => 'HBS_RENDERABLES'])]
 final class RenderablesContentObject extends AbstractHandlebarsFormsContentObject
 {
+    use CanUpdateRegister;
+
     private const IDENTIFIER_COUNT = 'HBS_RENDERABLES_COUNT';
     private const IDENTIFIER_CURRENT = 'HBS_RENDERABLES_CURRENT';
 
@@ -42,7 +45,9 @@ public function __construct(
         private readonly iterable $viewModelBuilders,
         private readonly Context\ContextStack $contextStack,
         private readonly Context\ValueCollector $valueCollector,
-    ) {}
+    ) {
+        $this->typo3Version = new Core\Information\Typo3Version();
+    }
 
     /**
      * @return list<mixed>
@@ -99,9 +104,7 @@ protected function resolve(array $configuration, Context\ValueResolutionContext
         }
 
         // Add renderables count to TSFE register
-        // @todo Use $this->request->getAttribute('frontend.register.stack') in TYPO3 v14
-        $tsfe = $this->getTypoScriptFrontendController();
-        $tsfe->register[self::IDENTIFIER_COUNT] = count($renderables);
+        $this->updateRegister(self::IDENTIFIER_COUNT, count($renderables));
 
         foreach ($renderables as $index => $child) {
             if (!$this->isEnabled($child)) {
@@ -109,7 +112,7 @@ protected function resolve(array $configuration, Context\ValueResolutionContext
             }
 
             // Add current renderable index to TSFE register
-            $tsfe->register[self::IDENTIFIER_CURRENT] = $index;
+            $this->updateRegister(self::IDENTIFIER_CURRENT, $index);
 
             try {
                 if (array_key_exists($child->getType() . '.', $configuration)) {
@@ -145,11 +148,11 @@ protected function resolve(array $configuration, Context\ValueResolutionContext
                     $processedRenderables[] = $processedChild;
                 }
             } finally {
-                unset($tsfe->register[self::IDENTIFIER_CURRENT]);
+                $this->updateRegister(self::IDENTIFIER_CURRENT);
             }
         }
 
-        unset($tsfe->register[self::IDENTIFIER_COUNT]);
+        $this->updateRegister(self::IDENTIFIER_COUNT);
 
         return $processedRenderables;
     }
diff --git a/Classes/Domain/Renderer/HandlebarsFormRenderer.php b/Classes/Domain/Renderer/HandlebarsFormRenderer.php
index 26adf14..59631e7 100644
--- a/Classes/Domain/Renderer/HandlebarsFormRenderer.php
+++ b/Classes/Domain/Renderer/HandlebarsFormRenderer.php
@@ -18,6 +18,7 @@
 namespace CPSIT\Typo3HandlebarsForms\Domain\Renderer;
 
 use CPSIT\Typo3Handlebars\View;
+use Psr\EventDispatcher;
 use Symfony\Component\DependencyInjection;
 use TYPO3\CMS\Core;
 use TYPO3\CMS\Extbase;
@@ -39,6 +40,7 @@ public function __construct(
         private readonly Extbase\Configuration\ConfigurationManagerInterface $configurationManager,
         private readonly View\HandlebarsViewFactory $viewFactory,
         private readonly Core\TypoScript\TypoScriptService $typoScriptService,
+        private readonly EventDispatcher\EventDispatcherInterface $eventDispatcher,
     ) {
         $this->typo3Version = new Core\Information\Typo3Version();
     }
@@ -172,13 +174,10 @@ private function triggerBeforeRenderingHook(): void
         }
     }
 
-    /**
-     * @todo Enable once support for TYPO3 v14 is added
-     */
     private function triggerBeforeRenderableIsRenderedEvent(): void
     {
-        // $this->eventDispatcher->dispatch(
-        //     new Form\Event\BeforeRenderableIsRenderedEvent($this->formRuntime->getFormDefinition(), $this->formRuntime),
-        // );
+        $this->eventDispatcher->dispatch(
+            new Form\Event\BeforeRenderableIsRenderedEvent($this->formRuntime->getFormDefinition(), $this->formRuntime),
+        );
     }
 }
diff --git a/Documentation/Installation/Index.rst b/Documentation/Installation/Index.rst
index c1920bf..e8a43d7 100644
--- a/Documentation/Installation/Index.rst
+++ b/Documentation/Installation/Index.rst
@@ -12,7 +12,7 @@ Requirements
 ============
 
 -   PHP 8.2 - 8.5
--   TYPO3 13.4 LTS
+-   TYPO3 13.4 LTS - 14.3 LTS
 
 ..  _steps:
 
diff --git a/Documentation/Introduction/Index.rst b/Documentation/Introduction/Index.rst
index 6673f96..7808e17 100644
--- a/Documentation/Introduction/Index.rst
+++ b/Documentation/Introduction/Index.rst
@@ -28,7 +28,7 @@ Features
 -   Ability to define generic form rendering definitions
 -   Possibility to override form rendering for specific form definitions
 -   Easy to extend and customize for custom form elements
--   Compatible with TYPO3 13.4 LTS
+-   Compatible with TYPO3 13.4 LTS and 14.3 LTS
 
 ..  _support:
 
diff --git a/README.md b/README.md
index bfe0fac..11ea922 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@ configured using dedicated interface implementations.
 * Ability to define generic form rendering definitions
 * Possibility to override form rendering for specific form definitions
 * Easy to extend and customize for custom form elements
-* Compatible with TYPO3 13.4 LTS
+* Compatible with TYPO3 13.4 LTS and 14.3 LTS
 
 ## 🔥 Installation
 
diff --git a/composer-dependency-analyser.php b/composer-dependency-analyser.php
new file mode 100644
index 0000000..7842810
--- /dev/null
+++ b/composer-dependency-analyser.php
@@ -0,0 +1,34 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the TYPO3 CMS extension "handlebars_forms".
+ *
+ * It is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License, either version 2
+ * of the License, or any later version.
+ *
+ * For the full copyright and license information, please read the
+ * LICENSE.txt file that was distributed with this source code.
+ *
+ * The TYPO3 project - inspiring people to share!
+ */
+
+use ShipMonk\ComposerDependencyAnalyser;
+use TYPO3\CMS\Form;
+use TYPO3\CMS\Frontend;
+
+$configuration = new ComposerDependencyAnalyser\Config\Configuration();
+$configuration
+    ->addPathToScan('Classes', false)
+    ->addPathToScan('Configuration', false)
+    ->addPathToScan('Tests', true)
+    ->ignoreUnknownClasses([
+        // @todo Remove once support for TYPO3 v13 is dropped
+        Form\Event\BeforeRenderableIsRenderedEvent::class,
+        Frontend\ContentObject\RegisterStack::class,
+    ])
+;
+
+return $configuration;
diff --git a/composer.json b/composer.json
index 12260f1..13d5a21 100644
--- a/composer.json
+++ b/composer.json
@@ -18,15 +18,16 @@
 		"ext-libxml": "*",
 		"cpsit/typo3-handlebars": "^1.0@alpha",
 		"devtheorem/php-handlebars": "^2.0",
+		"psr/event-dispatcher": "^1.0",
 		"psr/http-message": "^1.0 || ^2.0",
 		"psr/log": "^3.0",
 		"symfony/dependency-injection": "^7.0",
-		"typo3/cms-core": "~13.4.0",
-		"typo3/cms-extbase": "~13.4.0",
-		"typo3/cms-fluid": "~13.4.0",
-		"typo3/cms-form": "~13.4.0",
-		"typo3/cms-frontend": "~13.4.0",
-		"typo3fluid/fluid": "^4.0"
+		"typo3/cms-core": "~13.4.0 || ~14.3.0",
+		"typo3/cms-extbase": "~13.4.0 || ~14.3.0",
+		"typo3/cms-fluid": "~13.4.0 || ~14.3.0",
+		"typo3/cms-form": "~13.4.0 || ~14.3.0",
+		"typo3/cms-frontend": "~13.4.0 || ~14.3.0",
+		"typo3fluid/fluid": "^4.0 || ^5.0"
 	},
 	"require-dev": {
 		"armin/editorconfig-cli": "^2.0",
@@ -42,13 +43,13 @@
 		"phpstan/phpstan-strict-rules": "^2.0",
 		"phpunit/phpcov": "^10.0 || ^11.0 || ^12.0 || ^13.0",
 		"phpunit/phpunit": "^11.5 || ^12.5 || ^13.0",
-		"saschaegerer/phpstan-typo3": "^2.1",
+		"saschaegerer/phpstan-typo3": "^2.1 || ^3.0",
 		"shipmonk/composer-dependency-analyser": "^1.8",
 		"ssch/typo3-rector": "^3.11",
-		"typo3/cms-install": "~13.4.0",
-		"typo3/cms-tstemplate": "~13.4.0",
+		"typo3/cms-install": "~13.4.0 || ~14.3.0",
+		"typo3/cms-tstemplate": "~13.4.0 || ~14.3.0",
 		"typo3/coding-standards": "^0.8.0",
-		"typo3/testing-framework": "^9.3.0"
+		"typo3/testing-framework": "^9.5.0"
 	},
 	"repositories": [
 		{
diff --git a/composer.lock b/composer.lock
index 516a5af..bbfc862 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "fea9a00fc98ae939542288775521347e",
+    "content-hash": "d160ac923a30e9f44d0a6dfd96185275",
     "packages": [
         {
             "name": "bacon/bacon-qr-code",
diff --git a/packaging_exclude.php b/packaging_exclude.php
index e15630c..c820fc0 100644
--- a/packaging_exclude.php
+++ b/packaging_exclude.php
@@ -28,6 +28,7 @@
     'files' => [
         'DS_Store',
         'composer.lock',
+        'composer-dependency-analyser.php',
         'docker-compose.yml',
         'editorconfig',
         'gitattributes',
diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
index fb2eb36..8c98635 100644
--- a/phpstan-baseline.neon
+++ b/phpstan-baseline.neon
@@ -8,7 +8,25 @@ parameters:
 				            files. The class should vanish together with $GLOBALS['TSFE'] in v14.
 			'''
 			identifier: property.deprecatedClass
-			count: 4
+			count: 2
+			path: Classes/ContentObject/ChildrenContentObject.php
+
+		-
+			rawMessage: 'Call to method current() on an unknown class TYPO3\CMS\Frontend\ContentObject\RegisterStack.'
+			identifier: class.notFound
+			count: 1
+			path: Classes/ContentObject/ChildrenContentObject.php
+
+		-
+			rawMessage: 'Cannot call method set() on mixed.'
+			identifier: method.nonObject
+			count: 1
+			path: Classes/ContentObject/ChildrenContentObject.php
+
+		-
+			rawMessage: Class TYPO3\CMS\Frontend\ContentObject\RegisterStack not found.
+			identifier: class.notFound
+			count: 1
 			path: Classes/ContentObject/ChildrenContentObject.php
 
 		-
@@ -31,7 +49,25 @@ parameters:
 				            files. The class should vanish together with $GLOBALS['TSFE'] in v14.
 			'''
 			identifier: property.deprecatedClass
-			count: 4
+			count: 2
+			path: Classes/ContentObject/RenderablesContentObject.php
+
+		-
+			rawMessage: 'Call to method current() on an unknown class TYPO3\CMS\Frontend\ContentObject\RegisterStack.'
+			identifier: class.notFound
+			count: 1
+			path: Classes/ContentObject/RenderablesContentObject.php
+
+		-
+			rawMessage: 'Cannot call method set() on mixed.'
+			identifier: method.nonObject
+			count: 1
+			path: Classes/ContentObject/RenderablesContentObject.php
+
+		-
+			rawMessage: Class TYPO3\CMS\Frontend\ContentObject\RegisterStack not found.
+			identifier: class.notFound
+			count: 1
 			path: Classes/ContentObject/RenderablesContentObject.php
 
 		-
@@ -63,3 +99,9 @@ parameters:
 			identifier: offsetAccess.nonOffsetAccessible
 			count: 1
 			path: Classes/Domain/Renderer/HandlebarsFormRenderer.php
+
+		-
+			rawMessage: Instantiated class TYPO3\CMS\Form\Event\BeforeRenderableIsRenderedEvent not found.
+			identifier: class.notFound
+			count: 1
+			path: Classes/Domain/Renderer/HandlebarsFormRenderer.php
diff --git a/phpstan.neon b/phpstan.neon
index 86c398f..a960751 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -9,3 +9,6 @@ parameters:
 		- Tests
 	featureToggles:
 		internalTag: false
+	typo3:
+		requestGetAttributeMapping:
+			frontend.register.stack: TYPO3\CMS\Frontend\ContentObject\RegisterStack|null