diff --git a/composer.json b/composer.json
index 14511ec25..389d8da90 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,7 @@
 		"nette/php-generator": "^3.3.3",
 		"nette/robot-loader": "^3.2",
 		"nette/schema": "^1.0",
-		"nette/utils": "^3.1"
+		"nette/utils": "^3.0"
 	},
 	"require-dev": {
 		"nette/tester": "^2.2",
diff --git a/src/Bridges/DITracy/ContainerPanel.php b/src/Bridges/DITracy/ContainerPanel.php
index 93e88f79d..eb06c4e62 100644
--- a/src/Bridges/DITracy/ContainerPanel.php
+++ b/src/Bridges/DITracy/ContainerPanel.php
@@ -45,10 +45,10 @@ public function __construct(Container $container)
 	 */
 	public function getTab(): string
 	{
-		return Nette\Utils\Helpers::capture(function () {
-			$elapsedTime = $this->elapsedTime;
-			require __DIR__ . '/templates/ContainerPanel.tab.phtml';
-		});
+		ob_start(function () {});
+		$elapsedTime = $this->elapsedTime;
+		require __DIR__ . '/templates/ContainerPanel.tab.phtml';
+		return ob_get_clean();
 	}
 
 
@@ -57,8 +57,12 @@ public function getTab(): string
 	 */
 	public function getPanel(): string
 	{
-		$rc = new \ReflectionClass($this->container);
+		$container = $this->container;
+		$rc = new \ReflectionClass($container);
+		$file = $rc->getFileName();
 		$tags = [];
+		$instances = $this->getContainerProperty('instances');
+		$wiring = $this->getContainerProperty('wiring');
 		$types = [];
 		foreach ($rc->getMethods() as $method) {
 			if (preg_match('#^createService(.+)#', $method->name, $m) && $method->getReturnType()) {
@@ -73,13 +77,9 @@ public function getPanel(): string
 			}
 		}
 
-		return Nette\Utils\Helpers::capture(function () use ($tags, $types, $rc) {
-			$container = $this->container;
-			$file = $rc->getFileName();
-			$instances = $this->getContainerProperty('instances');
-			$wiring = $this->getContainerProperty('wiring');
-			require __DIR__ . '/templates/ContainerPanel.panel.phtml';
-		});
+		ob_start(function () {});
+		require __DIR__ . '/templates/ContainerPanel.panel.phtml';
+		return ob_get_clean();
 	}
 
 
diff --git a/src/DI/Compiler.php b/src/DI/Compiler.php
index c4ad760fd..50e2b0522 100644
--- a/src/DI/Compiler.php
+++ b/src/DI/Compiler.php
@@ -242,7 +242,7 @@ public function processExtensions(): void
 			throw new Nette\DeprecatedException("Extensions '$extra' were added while container was being compiled.");
 
 		} elseif ($extra = key(array_diff_key($this->configs, $this->extensions))) {
-			$hint = Nette\Utils\Helpers::getSuggestion(array_keys($this->extensions), $extra);
+			$hint = Nette\Utils\ObjectHelpers::getSuggestion(array_keys($this->extensions), $extra);
 			throw new InvalidConfigurationException(
 				"Found section '$extra' in configuration, but corresponding extension is missing"
 				. ($hint ? ", did you mean '$hint'?" : '.')
diff --git a/src/DI/CompilerExtension.php b/src/DI/CompilerExtension.php
index 29eef3688..4b0d9a14c 100644
--- a/src/DI/CompilerExtension.php
+++ b/src/DI/CompilerExtension.php
@@ -89,7 +89,7 @@ public function validateConfig(array $expected, array $config = null, string $na
 		}
 		if ($extra = array_diff_key((array) $config, $expected)) {
 			$name = $name ? str_replace('.', ' › ', $name) : $this->name;
-			$hint = Nette\Utils\Helpers::getSuggestion(array_keys($expected), key($extra));
+			$hint = Nette\Utils\ObjectHelpers::getSuggestion(array_keys($expected), key($extra));
 			$extra = $hint
 				? key($extra)
 				: implode("', '{$name} › ", array_keys($extra));
diff --git a/src/DI/ContainerLoader.php b/src/DI/ContainerLoader.php
index 255f04362..7cc22ca7c 100644
--- a/src/DI/ContainerLoader.php
+++ b/src/DI/ContainerLoader.php
@@ -67,9 +67,9 @@ private function loadFile(string $class, callable $generator): void
 
 		$handle = @fopen("$file.lock", 'c+'); // @ is escalated to exception
 		if (!$handle) {
-			throw new Nette\IOException("Unable to create file '$file.lock'. " . Nette\Utils\Helpers::getLastError());
+			throw new Nette\IOException("Unable to create file '$file.lock'. " . error_get_last()['message']);
 		} elseif (!@flock($handle, LOCK_EX)) { // @ is escalated to exception
-			throw new Nette\IOException("Unable to acquire exclusive lock on '$file.lock'. " . Nette\Utils\Helpers::getLastError());
+			throw new Nette\IOException("Unable to acquire exclusive lock on '$file.lock'. " . error_get_last()['message']);
 		}
 
 		if (!is_file($file) || $this->isExpired($file, $updatedMeta)) {
diff --git a/src/DI/Definitions/FactoryDefinition.php b/src/DI/Definitions/FactoryDefinition.php
index e409bf2c8..30ba30986 100644
--- a/src/DI/Definitions/FactoryDefinition.php
+++ b/src/DI/Definitions/FactoryDefinition.php
@@ -240,7 +240,7 @@ private function completeParameters(Nette\DI\Resolver $resolver): void
 				$this->resultDefinition->getFactory()->arguments[$arg->getPosition()] = Nette\DI\ContainerBuilder::literal('$' . $arg->name);
 
 			} elseif (!$this->resultDefinition->getSetup()) {
-				$hint = Nette\Utils\Helpers::getSuggestion(array_keys($ctorParams), $param->name);
+				$hint = Nette\Utils\ObjectHelpers::getSuggestion(array_keys($ctorParams), $param->name);
 				throw new ServiceCreationException("Unused parameter \${$param->name} when implementing method $interface::create()" . ($hint ? ", did you mean \${$hint}?" : '.'));
 			}
 			$nullable = $hint && $param->allowsNull() && (!$param->isDefaultValueAvailable() || $param->getDefaultValue() !== null);