diff --git a/src/Logging/Message.php b/src/Logging/Message.php
index 1816464..16442a0 100644
--- a/src/Logging/Message.php
+++ b/src/Logging/Message.php
@@ -4,29 +4,20 @@
 
 namespace Fykosak\Utils\Logging;
 
-use Nette\SmartObject;
 use Nette\Utils\Html;
 
 class Message
 {
-    use SmartObject;
-
     public const LVL_ERROR = 'danger';
     public const LVL_WARNING = 'warning';
     public const LVL_SUCCESS = 'success';
     public const LVL_INFO = 'info';
     public const LVL_PRIMARY = 'primary';
 
-    public $text;
-    public string $level;
-
-    /**
-     * @param string|Html $message
-     */
-    public function __construct($message, string $level)
-    {
-        $this->text = $message;
-        $this->level = $level;
+    public function __construct(
+        public readonly string|Html $text,
+        public readonly string $level
+    ) {
     }
 
     /**
diff --git a/src/Price/Currency.php b/src/Price/Currency.php
index 65e3cbe..c6df72d 100644
--- a/src/Price/Currency.php
+++ b/src/Price/Currency.php
@@ -4,67 +4,20 @@
 
 namespace Fykosak\Utils\Price;
 
-use Nette\NotImplementedException;
-use Nette\SmartObject;
-
 /**
  * something like enum :)
  */
-final class Currency
+enum Currency: string
 {
-    use SmartObject;
-
-    public const EUR = 'EUR';
-    public const CZK = 'CZK';
-
-    public string $value;
-
-    /**
-     * @throws NotImplementedException
-     */
-    public function __construct(string $currency)
-    {
-        $currency = strtoupper($currency);
-        if (!in_array($currency, [self::EUR, self::CZK])) {
-            throw new NotImplementedException(sprintf(_('Currency "%s" is not supported'), $currency));
-        }
-        $this->value = $currency;
-    }
-
-    /**
-     * @return self[]
-     */
-    public static function cases(): array
-    {
-        return [new self(self::CZK), new self(self::EUR)];
-    }
-
-    public static function tryFrom(string $currency): ?self
-    {
-        try {
-            return new self($currency);
-        } catch (NotImplementedException $exception) {
-            return null;
-        }
-    }
-
-    /**
-     * @throws NotImplementedException
-     */
-    public static function from(string $currency): self
-    {
-        return new self($currency);
-    }
+    case EUR = 'EUR';
+    case CZK = 'CZK';
 
     public function getLabel(): string
     {
-        switch ($this->value) {
-            case self::EUR:
-                return '€';
-            case self::CZK:
-                return 'Kč';
-        }
-        return '';
+        return match ($this) {
+            self::EUR => '€',
+            self::CZK => 'Kč',
+        };
     }
 
     public function format(float $amount): string
diff --git a/src/Price/Price.php b/src/Price/Price.php
index 64fae1b..26554ed 100644
--- a/src/Price/Price.php
+++ b/src/Price/Price.php
@@ -4,22 +4,15 @@
 
 namespace Fykosak\Utils\Price;
 
-use Nette\SmartObject;
-
-/**
- * @phpstan-type TSerializedPrice array{currency:string,amount:float}
- */
 final class Price
 {
-    use SmartObject;
-
-    private Currency $currency;
     private float $amount;
 
-    public function __construct(Currency $currency, ?float $amount = null)
-    {
+    public function __construct(
+        private readonly Currency $currency,
+        ?float $amount = null
+    ) {
         $this->amount = $amount ?? 0;
-        $this->currency = $currency;
     }
 
     /**
@@ -54,7 +47,7 @@ public function __toString(): string
     }
 
     /**
-     * @phpstan-return TSerializedPrice
+     * @phpstan-return array{currency:string,amount:float}
      */
     public function __serialize(): array
     {
diff --git a/src/UI/Navigation/NavItem.php b/src/UI/Navigation/NavItem.php
index 3683fef..b873300 100644
--- a/src/UI/Navigation/NavItem.php
+++ b/src/UI/Navigation/NavItem.php
@@ -5,35 +5,19 @@
 namespace Fykosak\Utils\UI\Navigation;
 
 use Fykosak\Utils\UI\Title;
-use Nette\SmartObject;
 
 class NavItem
 {
-    use SmartObject;
-
-    public string $destination;
-    /** @phpstan-var array<string,scalar> */
-    public array $linkParams;
-    public Title $title;
-    /** @var NavItem[] */
-    public array $children;
-    public bool $active;
-
     /**
      * @phpstan-param array<string,scalar> $linkParams
      * @phpstan-param NavItem[] $children
      */
     public function __construct(
-        Title $title,
-        string $destination = '#',
-        array $linkParams = [],
-        array $children = [],
-        bool $active = false
+        public readonly Title $title,
+        public readonly string $destination = '#',
+        public readonly array $linkParams = [],
+        public readonly array $children = [],
+        public readonly bool $active = false
     ) {
-        $this->active = $active;
-        $this->destination = $destination;
-        $this->linkParams = $linkParams;
-        $this->title = $title;
-        $this->children = $children;
     }
 }
diff --git a/src/UI/PageTitle.php b/src/UI/PageTitle.php
index 983dc7b..9eb9085 100644
--- a/src/UI/PageTitle.php
+++ b/src/UI/PageTitle.php
@@ -8,17 +8,14 @@
 
 class PageTitle extends Title
 {
-    /** @var string|Html|null */
-    public $subTitle;
-
-    /**
-     * @param string|Html $title
-     * @param string|Html|null $subTitle
-     */
-    public function __construct(?string $id, $title, ?string $icon = null, $subTitle = null)
+    public function __construct(
+        ?string $id,
+        string|Html $title,
+        ?string $icon = null,
+        public string|Html|null $subTitle = null
+    )
     {
         parent::__construct($id, $title, $icon);
-        $this->subTitle = $subTitle;
     }
 
     public function toHtml(bool $includeSubTitle = false): Html
diff --git a/src/UI/Title.php b/src/UI/Title.php
index b5fbeb8..5cbaf7b 100644
--- a/src/UI/Title.php
+++ b/src/UI/Title.php
@@ -9,18 +9,13 @@
 
 class Title
 {
-    /** @var string|Html */
-    public $title;
-    public ?string $icon;
-    public string $id;
+    public readonly string $id;
 
-    /**
-     * @param string|Html $title
-     */
-    public function __construct(?string $id, $title, ?string $icon = null)
-    {
-        $this->title = $title;
-        $this->icon = $icon;
+    public function __construct(
+        ?string $id,
+        public readonly string|Html $title,
+        public readonly ?string $icon = null
+    ) {
         $this->id = $id ?? Random::generate(10, 'a-z');
     }