diff --git a/.github/workflows/php.yml b/.github/workflows/php.yml
index 34dc032..bca7b21 100644
--- a/.github/workflows/php.yml
+++ b/.github/workflows/php.yml
@@ -15,23 +15,34 @@ jobs:
         strategy:
             matrix:
                 operating-system: [ubuntu-latest]
-                php-versions: ['7.4', '8.0', '8.1']
-        name: PHP ${{ matrix.php-versions }} Test on ${{ matrix.operating-system }}
+                php-version: ['7.4', '8.0', '8.1', '8.2']
+        name: PHP ${{ matrix.php-version }}
         steps:
             - name: Checkout
               uses: actions/checkout@v2
             - name: Install PHP
               uses: shivammathur/setup-php@v2
               with:
-                  php-version: ${{ matrix.php-versions }}
+                  php-version: ${{ matrix.php-version }}
                   coverage: xdebug
                   tools: composer
             - name: Install package
               run: |
                   composer install
-            - name: Checks
+            - name: Phpstan rules for PHP ${{ matrix.php-version }}
+              if: ${{ matrix.php-version == '7.4' || matrix.php-version == '8.0' }}
+              run: cp phpstan_below_81.neon phpstan.neon
+            - name: Main checks
               run: |
-                  composer ci:pack
+                  composer phpcs
+                  composer phpstan
+                  composer phpunit
+            - name: Infection and coverage
+              if: ${{ matrix.php-version == '8.1' || matrix.php-version == '8.2' }}
+              run: |
+                  composer infection
+                  composer coverage
+                  composer phpunit
             - name: Upload codecoverage
               run: |
-                  bash <(curl -s https://codecov.io/bash)
\ No newline at end of file
+                  bash <(curl -s https://codecov.io/bash)
diff --git a/README.md b/README.md
index a348512..f57b0ba 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
 [![PHP build](https://github.com/yaroslavche/BitMask/actions/workflows/php.yml/badge.svg)](https://github.com/yaroslavche/BitMask/actions/workflows/php.yml)
 [![codecov](https://codecov.io/gh/yaroslavche/bitmask/branch/main/graph/badge.svg)](https://codecov.io/gh/yaroslavche/bitmask)
 [![Infection MSI](https://badge.stryker-mutator.io/github.com/yaroslavche/BitMask/main)](https://infection.github.io)
+[![PHP](http://poser.pugx.org/yaroslavche/bitmask/require/php)](https://packagist.org/packages/yaroslavche/bitmask)
 # BitMask
 
 PHP library for working with bitmask values
@@ -87,6 +88,33 @@ $bitmask->executable = false;
 $bitmask->unknownKey = true; // BitMask\Exception\UnknownKeyException
 ``` 
 
+With PHP ^8.1 `EnumBitMask` can be used:
+
+```php
+enum Permissions {
+    case Read;
+    case Write;
+    case Execute;
+}
+
+use BitMask\EnumBitMask;
+
+// First argument is required and expects FQCN of the enum
+// Second argument is a variadic UnitEnum, and acts like setter of the bits
+$bitmask = new EnumBitMask(Permissions::class, Permissions::Read, Permissions::Execute);
+// previous statement is equals to following lines:
+// $bitmask = new EnumBitMask(Permissions::class); 
+// $bitmask->set(Permissions::Read, Permissions::Execute); // set, isSet and unset also have variadic args
+
+$bitmask->isSet(Permissions::Read); // true
+$bitmask->isSet(Permissions::Write); // false
+$bitmask->isSet(Permissions::Execute); // true
+$bitmask->set(Permissions::Write);
+$bitmask->isSet(Permissions::Write, Permissions::Read); // true
+$bitmask->unset(Permissions::Write);
+$bitmask->isSet(Permissions::Write); // false
+```
+
 ## Installing
 
 Install package via [composer](https://getcomposer.org/) 
diff --git a/composer.json b/composer.json
index ee15ac7..37754ae 100644
--- a/composer.json
+++ b/composer.json
@@ -12,7 +12,7 @@
     "php8"
   ],
   "require": {
-    "php": "^7.4|^8.0|^8.1"
+    "php": "^7.4|^8.0"
   },
   "require-dev": {
     "phpunit/phpunit": "*",
diff --git a/phpstan.neon b/phpstan.neon
index 4789c45..a0e6887 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -1,2 +1,2 @@
-includes:
-    - vendor/thecodingmachine/phpstan-strict-rules/phpstan-strict-rules.neon
+parameters:
+    level: 9
diff --git a/phpstan_below_81.neon b/phpstan_below_81.neon
new file mode 100644
index 0000000..263ae93
--- /dev/null
+++ b/phpstan_below_81.neon
@@ -0,0 +1,6 @@
+parameters:
+    level: 9
+    excludePaths:
+        analyseAndScan:
+            - src/EnumBitMask.php
+            - tests/EnumBitMaskTest.php
diff --git a/src/EnumBitMask.php b/src/EnumBitMask.php
new file mode 100644
index 0000000..2a2a6f7
--- /dev/null
+++ b/src/EnumBitMask.php
@@ -0,0 +1,79 @@
+<?php // phpcs:disable PSR1.Files.SideEffects.FoundWithSymbols
+
+declare(strict_types=1);
+
+namespace BitMask;
+
+use BitMask\Exception\UnknownEnumException;
+use BitMask\Exception\UnsupportedPhpVersionException;
+use UnitEnum;
+
+use const PHP_VERSION_ID;
+
+PHP_VERSION_ID >= 80100 || throw new UnsupportedPhpVersionException('Requires PHP 8.1 interface UnitEnum');
+class EnumBitMask
+{
+    private int $bitmask = 0;
+    /** @var UnitEnum[] $keys */
+    private array $keys = [];
+
+    /**
+     * @param class-string $maskEnum
+     * @throws UnknownEnumException
+     */
+    public function __construct(
+        private readonly string $maskEnum,
+        UnitEnum ...$bits,
+    ) {
+        if (!is_subclass_of($this->maskEnum, UnitEnum::class)) {
+            throw new UnknownEnumException('BitMask enum must be instance of UnitEnum');
+        }
+        $this->keys = $this->maskEnum::cases();
+        $this->set(...$bits);
+    }
+
+    public function get(): int
+    {
+        return $this->bitmask;
+    }
+
+    /** @throws UnknownEnumException */
+    public function set(UnitEnum ...$bits): void
+    {
+        foreach ($bits as $bit) {
+            if (!$this->isSet($bit)) {
+                $this->bitmask += 1 << intval(array_search($bit, $this->keys));
+            }
+        }
+    }
+
+    /** @throws UnknownEnumException */
+    public function unset(UnitEnum ...$bits): void
+    {
+        foreach ($bits as $bit) {
+            if ($this->isSet($bit)) {
+                $this->bitmask -= 1 << intval(array_search($bit, $this->keys));
+            }
+        }
+    }
+
+    /** @throws UnknownEnumException */
+    public function isSet(UnitEnum ...$bits): bool
+    {
+        foreach ($bits as $bit) {
+            $this->checkEnumCase($bit);
+            $mask = 1 << intval(array_search($bit, $this->keys));
+            if (($this->bitmask & $mask) !== $mask) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    /** @throws UnknownEnumException */
+    private function checkEnumCase(UnitEnum $case): void
+    {
+        $case instanceof $this->maskEnum ||
+        throw new UnknownEnumException(sprintf('Expected %s enum case, %s provided', $this->maskEnum, $case::class));
+    }
+}
diff --git a/src/Exception/UnknownEnumException.php b/src/Exception/UnknownEnumException.php
new file mode 100644
index 0000000..0f040c2
--- /dev/null
+++ b/src/Exception/UnknownEnumException.php
@@ -0,0 +1,11 @@
+<?php
+
+declare(strict_types=1);
+
+namespace BitMask\Exception;
+
+use Exception;
+
+final class UnknownEnumException extends Exception
+{
+}
diff --git a/src/Exception/UnsupportedPhpVersionException.php b/src/Exception/UnsupportedPhpVersionException.php
new file mode 100644
index 0000000..790b30d
--- /dev/null
+++ b/src/Exception/UnsupportedPhpVersionException.php
@@ -0,0 +1,11 @@
+<?php
+
+declare(strict_types=1);
+
+namespace BitMask\Exception;
+
+use Exception;
+
+final class UnsupportedPhpVersionException extends Exception
+{
+}
diff --git a/tests/EnumBitMaskTest.php b/tests/EnumBitMaskTest.php
new file mode 100644
index 0000000..73f6964
--- /dev/null
+++ b/tests/EnumBitMaskTest.php
@@ -0,0 +1,73 @@
+<?php
+
+declare(strict_types=1);
+
+namespace BitMask\Tests;
+
+use BitMask\EnumBitMask;
+use BitMask\Exception\UnknownEnumException;
+use BitMask\Tests\fixtures\Enum\Permissions;
+use BitMask\Tests\fixtures\Enum\Unknown;
+use PHPUnit\Framework\TestCase;
+use function PHPUnit\Framework\assertFalse;
+use function PHPUnit\Framework\assertSame;
+use function PHPUnit\Framework\assertTrue;
+use const PHP_VERSION_ID;
+
+final class EnumBitMaskTest extends TestCase
+{
+    protected function setUp(): void
+    {
+        if (PHP_VERSION_ID < 80100) {
+            $this->markTestSkipped('PHP ^8.1 only');
+        }
+    }
+
+    public function testNotAnEnum(): void
+    {
+        $this->expectException(UnknownEnumException::class);
+        new EnumBitMask(self::class);
+    }
+
+    public function testUnknownEnum(): void
+    {
+        $this->expectException(UnknownEnumException::class);
+        new EnumBitMask(Permissions::class, Unknown::Case);
+    }
+
+    public function testGet(): void
+    {
+        $enumBitmask = new EnumBitMask(Permissions::class, Permissions::Create, Permissions::Read);
+        assertSame(3, $enumBitmask->get());
+        $this->expectException(UnknownEnumException::class);
+        $enumBitmask->isSet(Unknown::Case);
+    }
+
+    public function testIsSet(): void
+    {
+        $enumBitmask = new EnumBitMask(Permissions::class, Permissions::Create, Permissions::Read);
+        assertTrue($enumBitmask->isSet(Permissions::Create));
+        assertTrue($enumBitmask->isSet(Permissions::Read));
+        assertFalse($enumBitmask->isSet(Permissions::Update));
+        assertFalse($enumBitmask->isSet(Permissions::Delete));
+        $this->expectException(UnknownEnumException::class);
+        $enumBitmask->isSet(Unknown::Case);
+    }
+
+    public function testSetUnset(): void
+    {
+        $enumBitmask = new EnumBitMask(Permissions::class, Permissions::Create, Permissions::Read);
+        $enumBitmask->unset(Permissions::Create, Permissions::Read);
+        assertFalse($enumBitmask->isSet(Permissions::Create));
+        assertFalse($enumBitmask->isSet(Permissions::Read));
+        assertFalse($enumBitmask->isSet(Permissions::Read, Permissions::Update));
+        assertSame(0, $enumBitmask->get());
+        $enumBitmask->set(Permissions::Update, Permissions::Delete);
+        assertTrue($enumBitmask->isSet(Permissions::Update));
+        assertTrue($enumBitmask->isSet(Permissions::Delete));
+        assertTrue($enumBitmask->isSet(Permissions::Update, Permissions::Delete));
+        assertSame(12, $enumBitmask->get());
+        $this->expectException(UnknownEnumException::class);
+        $enumBitmask->unset(Unknown::Case);
+    }
+}
diff --git a/tests/fixtures/Enum/Permissions.php b/tests/fixtures/Enum/Permissions.php
new file mode 100644
index 0000000..db84b00
--- /dev/null
+++ b/tests/fixtures/Enum/Permissions.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace BitMask\Tests\fixtures\Enum;
+
+enum Permissions
+{
+    case Create;
+    case Read;
+    case Update;
+    case Delete;
+}
diff --git a/tests/fixtures/Enum/Unknown.php b/tests/fixtures/Enum/Unknown.php
new file mode 100644
index 0000000..b9fd738
--- /dev/null
+++ b/tests/fixtures/Enum/Unknown.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace BitMask\Tests\fixtures\Enum;
+
+enum Unknown
+{
+    case Case;
+}