diff --git a/composer.json b/composer.json
index 95d81894..01cfc80f 100644
--- a/composer.json
+++ b/composer.json
@@ -16,14 +16,14 @@
 	],
 	"require": {
 		"php": ">=7.2 <8.3",
-		"nette/utils": "^3.1"
+		"nette/utils": "^3.2.1 || ~4.0.0"
 	},
 	"require-dev": {
 		"nette/di": "^3.0",
-		"nette/tester": "^2.0",
+		"nette/tester": "^2.4",
 		"nette/security": "^3.0",
-		"tracy/tracy": "^2.4",
-		"phpstan/phpstan": "^0.12"
+		"tracy/tracy": "^2.8",
+		"phpstan/phpstan": "^1.0"
 	},
 	"conflict": {
 		"nette/di": "<3.0.3",
diff --git a/src/Http/Session.php b/src/Http/Session.php
index 87536242..3ab4cdd1 100644
--- a/src/Http/Session.php
+++ b/src/Http/Session.php
@@ -134,7 +134,7 @@ function (string $message) use (&$e): void {
 		}
 
 		$this->initialize();
-		$this->onStart($this);
+		Nette\Utils\Arrays::invoke($this->onStart, $this);
 	}
 
 
@@ -361,7 +361,7 @@ public function clean(): void
 			return;
 		}
 
-		$this->onBeforeWrite($this);
+		Nette\Utils\Arrays::invoke($this->onBeforeWrite, $this);
 
 		$nf = &$_SESSION['__NF'];
 		foreach ($nf['META'] ?? [] as $name => $foo) {