diff --git a/CHANGELOG.md b/CHANGELOG.md
index 17649ff..828e0c9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+## 1.0.0 - WIP
+- Upgrade dev package PestPHP 3
+- Upgrade dev package PHPstan 2
+- Upgrade dev package Rector 2
+
 ## 0.4.4 - 2025-03-22
 - Adding `getBoolean()` method for returning boolean value
 
diff --git a/composer.json b/composer.json
index 80d39c6..0047600 100644
--- a/composer.json
+++ b/composer.json
@@ -18,15 +18,15 @@
         }
     ],
     "require": {
-        "php": "^8.1|^8.2|^8.3|^8.4",
+        "php": "^8.2|^8.3|^8.4",
         "swaggest/json-schema": "^0.12.42",
         "symfony/yaml": "^6.4|^7.1"
     },
     "require-dev": {
         "laravel/pint": "^1.2",
-        "pestphp/pest": "^2.34",
-        "phpstan/phpstan": "^1.6",
-        "rector/rector": "^1"
+        "pestphp/pest": "^3.0",
+        "phpstan/phpstan": "^2",
+        "rector/rector": "^2"
     },
     "autoload": {
         "psr-4": {
diff --git a/rector.php b/rector.php
index 4ebb558..bb3868b 100644
--- a/rector.php
+++ b/rector.php
@@ -11,7 +11,7 @@
     ])
     // uncomment to reach your current PHP version
     ->withPhpSets(
-        php81: true,
+        php82: true,
     )
     ->withPreparedSets(
         deadCode: true,
diff --git a/src/Block.php b/src/Block.php
index 50c85cc..af6f2ed 100644
--- a/src/Block.php
+++ b/src/Block.php
@@ -36,13 +36,10 @@ final class Block implements Iterator, ArrayAccess, Countable
     /** @var array<int|string, mixed> */
     private array $data;
 
-    private bool $iteratorReturnsBlock = true;
-
     /** @param array<int|string, mixed> $data */
-    public function __construct(array $data = [], bool $iteratorReturnsBlock = true)
+    public function __construct(array $data = [], private bool $iteratorReturnsBlock = true)
     {
         $this->data = $data;
-        $this->iteratorReturnsBlock = $iteratorReturnsBlock;
     }
 
     public function iterateBlock(bool $returnsBlock = true): self
@@ -204,9 +201,9 @@ public function values(): self
      * It returns Block or [] depending on $returnArrClass value
      *
      * @param bool $returnBlockClass true if you need Block object
-     * @return int|string|array<int|string, mixed>|Block
+     * @return array<int|string, mixed>|Block
      */
-    public function keys(bool $returnBlockClass = false): int|string|array|Block
+    public function keys(bool $returnBlockClass = false): array|Block
     {
         if ($returnBlockClass) {
             return self::make(array_keys($this->data));
diff --git a/tests/Feature/BlockTest.php b/tests/Feature/BlockTest.php
index 5553828..7affd75 100644
--- a/tests/Feature/BlockTest.php
+++ b/tests/Feature/BlockTest.php
@@ -70,7 +70,7 @@
     expect($composer->getBlock("require.php"))->toBeInstanceOf(Block::class);
     expect($composer->get("require.php"))->toBeString();
 
-    expect($composer->getBlock("require")->has("^8.1|^8.2|^8.3|^8.4"))->toBeTrue();
+    expect($composer->getBlock("require")->has("^8.2|^8.3|^8.4"))->toBeTrue();
     expect($composer->getBlock("require")->hasKey("php"))->toBeTrue();
     expect($composer->getBlock("require-dev")->hasKey("pestphp/pest"))->toBeTrue();
 });