diff --git a/src/ServerRequest/Cookies.php b/src/ServerRequest/Cookies.php
index 639983f..201a175 100644
--- a/src/ServerRequest/Cookies.php
+++ b/src/ServerRequest/Cookies.php
@@ -14,18 +14,11 @@
  */
 final class Cookies implements \Countable
 {
-    /** @var Map<string, string> */
-    private Map $cookies;
-
     /**
-     * @param Map<string, string>|null $cookies
+     * @param Map<string, string> $cookies
      */
-    private function __construct(?Map $cookies = null)
+    private function __construct(private Map $cookies)
     {
-        /** @var Map<string, string> */
-        $cookies = $cookies ?? Map::of();
-
-        $this->cookies = $cookies;
     }
 
     /**
@@ -36,7 +29,7 @@ private function __construct(?Map $cookies = null)
     #[\NoDiscard]
     public static function of(?Map $cookies = null): self
     {
-        return new self($cookies);
+        return new self($cookies ?? Map::of());
     }
 
     /**
diff --git a/src/ServerRequest/Environment.php b/src/ServerRequest/Environment.php
index 2c3c87a..2b191dd 100644
--- a/src/ServerRequest/Environment.php
+++ b/src/ServerRequest/Environment.php
@@ -14,18 +14,11 @@
  */
 final class Environment implements \Countable
 {
-    /** @var Map<string, string> */
-    private Map $variables;
-
     /**
-     * @param Map<string, string>|null $variables
+     * @param Map<string, string> $variables
      */
-    private function __construct(?Map $variables = null)
+    private function __construct(private Map $variables)
     {
-        /** @var Map<string, string> */
-        $variables = $variables ?? Map::of();
-
-        $this->variables = $variables;
     }
 
     /**
@@ -36,7 +29,7 @@ private function __construct(?Map $variables = null)
     #[\NoDiscard]
     public static function of(?Map $variables = null): self
     {
-        return new self($variables);
+        return new self($variables ?? Map::of());
     }
 
     /**
diff --git a/src/ServerRequest/Query.php b/src/ServerRequest/Query.php
index b03795d..b19be56 100644
--- a/src/ServerRequest/Query.php
+++ b/src/ServerRequest/Query.php
@@ -13,7 +13,6 @@ final class Query implements \Countable
     private function __construct(
         private array $data,
     ) {
-        $this->data = $data;
     }
 
     /**