diff --git a/composer.json b/composer.json
index 54a0508..3c470aa 100644
--- a/composer.json
+++ b/composer.json
@@ -5,7 +5,7 @@
 	"homepage": "https://www.appsdevteam.com",
 	"license": ["MIT"],
 	"require": {
-		"php": ">=7.4",
+		"php": ">=8.0",
 		"doctrine/orm": "^2.4",
 		"adt/nette-forms-components": "^1.0",
 		"symfony/property-access": "~3.3 || ^4.0 || ^5.0"
diff --git a/src/BaseForm.php b/src/BaseForm.php
index 879c12b..8e5a95b 100644
--- a/src/BaseForm.php
+++ b/src/BaseForm.php
@@ -59,7 +59,7 @@ public function __construct()
 
 	// we need to call initOnAfterMapToForm last
 	// so we will remove initOnAfterMapToForm, add callbak and add initOnAfterMapToForm again
-	public function setOnAfterInitForm(callable $onAfterInitForm): self
+	public function setOnAfterInitForm(callable $onAfterInitForm): static
 	{
 		array_pop($this->onAfterInitForm);
 		$this->onAfterInitForm[] = $onAfterInitForm;
@@ -67,19 +67,19 @@ public function setOnAfterInitForm(callable $onAfterInitForm): self
 		return $this;
 	}
 
-	public function setOnAfterMapToForm(callable $onAfterMapToForm): self
+	public function setOnAfterMapToForm(callable $onAfterMapToForm): static
 	{
 		$this->onAfterMapToForm[] = $onAfterMapToForm;
 		return $this;
 	}
 
-	public function setOnAfterMapToEntity(callable $onAfterMapToEntity): self
+	public function setOnAfterMapToEntity(callable $onAfterMapToEntity): static
 	{
 		$this->onAfterMapToEntity[] = $onAfterMapToEntity;
 		return $this;
 	}
 
-	final public function setEntity(Entity $entity): self
+	final public function setEntity(Entity $entity): static
 	{
 		$this->entity = $entity;
 		if (isset($this->components['form'])) {
diff --git a/src/Entity.php b/src/Entity.php
index 43b2553..5a8c612 100644
--- a/src/Entity.php
+++ b/src/Entity.php
@@ -5,4 +5,6 @@
 interface Entity
 {
 	public function getId();
+
+	public function get($field);
 }
diff --git a/src/Form.php b/src/Form.php
index 77b723a..b8c74fb 100644
--- a/src/Form.php
+++ b/src/Form.php
@@ -33,13 +33,13 @@ public function getEntityMapper(): EntityFormMapper
 		return $this->entityMapper;
 	}
 
-	public function setEntityManager(EntityManagerInterface $entityManager): self
+	public function setEntityManager(EntityManagerInterface $entityManager): static
 	{
 		$this->entityManager = $entityManager;
 		return $this;
 	}
 
-	public function setEntity(object $entity): self
+	public function setEntity(object $entity): static
 	{
 		if (!is_object($entity)) {
 			throw new InvalidArgumentException('Expected object, ' . gettype($entity) . ' given.');
@@ -73,7 +73,7 @@ public function getComponentFormMapper(IComponent $component): ?\Closure
 		return $this->componentFormMappers[spl_object_hash($component)] ?? null;
 	}
 
-	public function setComponentFormMapper(IComponent $component, \Closure $formMapper): self
+	public function setComponentFormMapper(IComponent $component, \Closure $formMapper): static
 	{
 		$this->componentFormMappers[spl_object_hash($component)] = $formMapper;
 		return $this;
@@ -84,7 +84,7 @@ public function getComponentEntityMapper(IComponent $component): ?\Closure
 		return $this->componentEntityMappers[spl_object_hash($component)] ?? null;
 	}
 
-	public function setComponentEntityMapper(IComponent $component, \Closure $entityMapper): self
+	public function setComponentEntityMapper(IComponent $component, \Closure $entityMapper): static
 	{
 		$this->componentEntityMappers[spl_object_hash($component)] = $entityMapper;
 		return $this;
@@ -95,7 +95,7 @@ public function getComponentEntityFactory(IComponent $component): ?\Closure
 		return $this->componentEntityFactories[spl_object_hash($component)] ?? null;
 	}
 
-	public function setComponentEntityFactory(IComponent $component, \Closure $entityFactory): self
+	public function setComponentEntityFactory(IComponent $component, \Closure $entityFactory): static
 	{
 		$this->componentEntityFactories[spl_object_hash($component)] = $entityFactory;
 		return $this;