diff --git a/src/Session.php b/src/Session.php
index 302a812..7f40e42 100644
--- a/src/Session.php
+++ b/src/Session.php
@@ -18,19 +18,14 @@
  */
 final class Session
 {
-    private Id $id;
-    private Name $name;
-    /** @var Map<string, mixed> */
-    private Map $values;
-
     /**
      * @param Map<string, mixed> $values
      */
-    private function __construct(Id $id, Name $name, Map $values)
-    {
-        $this->id = $id;
-        $this->name = $name;
-        $this->values = $values;
+    private function __construct(
+        private Id $id,
+        private Name $name,
+        private Map $values,
+    ) {
     }
 
     /**
diff --git a/src/Session/Id.php b/src/Session/Id.php
index c3e6cfd..a2b3364 100644
--- a/src/Session/Id.php
+++ b/src/Session/Id.php
@@ -13,11 +13,8 @@
  */
 final class Id
 {
-    private string $value;
-
-    private function __construct(string $value)
+    private function __construct(private string $value)
     {
-        $this->value = $value;
     }
 
     /**
diff --git a/src/Session/Name.php b/src/Session/Name.php
index 4067c26..0066a05 100644
--- a/src/Session/Name.php
+++ b/src/Session/Name.php
@@ -14,11 +14,8 @@
  */
 final class Name
 {
-    private string $value;
-
-    private function __construct(string $value)
+    private function __construct(private string $value)
     {
-        $this->value = $value;
     }
 
     /**