diff --git a/composer.json b/composer.json
index 526de4a..36a0e4a 100644
--- a/composer.json
+++ b/composer.json
@@ -24,7 +24,8 @@
     "webchemistry/testing-helpers": "~2.0.0"
   },
   "conflict": {
-    "latte/latte": "<3.0.0"
+    "latte/latte": "<3.0.0",
+    "nette/component-model": "<3.1.0"
   },
   "autoload": {
     "psr-4": {
diff --git a/src/Multiplier.php b/src/Multiplier.php
index 20d3c38..c95d6cc 100644
--- a/src/Multiplier.php
+++ b/src/Multiplier.php
@@ -307,13 +307,13 @@ public function getControls(): Iterator
 	}
 
 	/**
-	 * @return Iterator<int|string,Container>
+	 * @return array<int|string,Container>
 	 */
-	public function getContainers(): Iterator
+	public function getContainers(): iterable
 	{
 		$this->createCopies();
 
-		/** @var Iterator<int|string,Container> $containers */
+		/** @var array<int|string,Container> $containers */
 		$containers = $this->getComponents(false, Container::class);
 
 		return $containers;
@@ -393,7 +393,7 @@ protected function loadHttpData(): void
 
 	protected function createNumber(): int
 	{
-		$count = iterator_count($this->getComponents(false, Form::class));
+		$count = count($this->getComponents(false, Form::class));
 		while ($this->getComponent((string) $count, false)) {
 			$count++;
 		}
@@ -428,7 +428,7 @@ protected function createContainer(): Container
 	 */
 	protected function getFirstSubmit(): ?string
 	{
-		$submits = iterator_to_array($this->getComponents(false, SubmitButton::class));
+		$submits = $this->getComponents(false, SubmitButton::class);
 		if ($submits) {
 			return reset($submits)->getName();
 		}