diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 7a95124..524af2d 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -34,12 +34,13 @@ jobs:
           COMPOSER_CACHE_KEY: 'composer-7.2'
         with:
           path: vendor
-          key: ${{ env.COMPOSER_CACHE_KEY }}
+          key: ${{ env.COMPOSER_CACHE_KEY }}-${{ hashFiles('composer.json') }}
           restore-keys: ${{ env.COMPOSER_CACHE_KEY }}
 
       - name: Install dependencies
-        if: steps.composer-cache.outputs.cache-hit != 'true'
-        run: composer install --prefer-dist --no-progress --no-suggest
+        run: |
+          /opt/spaceonfire/bin/select-composer.sh v2
+          composer install --prefer-dist --no-progress
 
       - name: Check coding standard
         run: vendor/bin/ecs check --no-progress-bar --no-interaction
@@ -58,12 +59,13 @@ jobs:
           COMPOSER_CACHE_KEY: 'composer-7.2'
         with:
           path: vendor
-          key: ${{ env.COMPOSER_CACHE_KEY }}
+          key: ${{ env.COMPOSER_CACHE_KEY }}-${{ hashFiles('composer.json') }}
           restore-keys: ${{ env.COMPOSER_CACHE_KEY }}
 
       - name: Install dependencies
-        if: steps.composer-cache.outputs.cache-hit != 'true'
-        run: composer install --prefer-dist --no-progress --no-suggest
+        run: |
+          /opt/spaceonfire/bin/select-composer.sh v2
+          composer install --prefer-dist --no-progress
 
       - name: PHPStan
         run: vendor/bin/phpstan analyse --no-progress --no-interaction
@@ -76,6 +78,7 @@ jobs:
           - '7.2'
           - '7.3'
           - '7.4'
+          - '8.0'
     container: spaceonfire/nginx-php-fpm:latest-${{ matrix.php-version }}
     steps:
       - name: Checkout
@@ -88,18 +91,19 @@ jobs:
           COMPOSER_CACHE_KEY: 'composer-${{ matrix.php-version }}'
         with:
           path: vendor
-          key: ${{ env.COMPOSER_CACHE_KEY }}
+          key: ${{ env.COMPOSER_CACHE_KEY }}-${{ hashFiles('composer.json') }}
           restore-keys: ${{ env.COMPOSER_CACHE_KEY }}
 
       - name: Install dependencies
-        if: steps.composer-cache.outputs.cache-hit != 'true'
-        run: composer install --prefer-dist --no-progress --no-suggest
+        run: |
+          /opt/spaceonfire/bin/select-composer.sh v2
+          composer install --prefer-dist --no-progress
 
       - name: PHPUnit
         run: |
           apk update
           docker-php-ext-enable xdebug
-          vendor/bin/phpunit --no-interaction
+          php -d xdebug.mode=coverage vendor/bin/phpunit --no-interaction
           cat build/coverage.txt
 
       - name: PHPUnit Artifacts
diff --git a/CHANGELOG.md b/CHANGELOG.md
index a98afbe..08408ef 100755
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,12 @@ Updates should follow the [Keep a CHANGELOG](http://keepachangelog.com/) princip
 - Nothing
 -->
 
+## [2.4.1] - 2020-02-19
+
+### Added
+
+- Support installation on PHP 8
+
 ## [2.4.0] - 2020-12-19
 
 ### Added
diff --git a/composer.json b/composer.json
index 9152a68..235801f 100755
--- a/composer.json
+++ b/composer.json
@@ -26,15 +26,16 @@
     }
   ],
   "require": {
-    "php": "^7.2",
+    "php": "^7.2|^8.0",
     "psr/container": "^1.0",
     "spaceonfire/collection": "^2.0"
   },
   "require-dev": {
-    "phpunit/phpunit": "^8.5",
+    "phpunit/phpunit": "^8.5|^9.5",
+    "phpspec/prophecy-phpunit": "^1.1|^2.0",
     "phpstan/phpstan": "^0.12",
     "roave/security-advisories": "dev-master",
-    "symplify/easy-coding-standard-prefixed": "^8.3"
+    "symplify/easy-coding-standard-prefixed": "^8.3|^9.1"
   },
   "provide": {
     "psr/container-implementation": "^1.0"
@@ -50,7 +51,7 @@
     }
   },
   "scripts": {
-    "test": "phpunit",
+    "test": "@php -d xdebug.mode=coverage `which phpunit`",
     "codestyle": "ecs check --ansi",
     "lint": "phpstan analyze --memory-limit=512M --ansi"
   },
diff --git a/tests/AbstractTestCase.php b/tests/AbstractTestCase.php
new file mode 100644
index 0000000..ece1737
--- /dev/null
+++ b/tests/AbstractTestCase.php
@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+namespace spaceonfire\Container;
+
+use PHPUnit\Framework\TestCase;
+
+if (trait_exists('\Prophecy\PhpUnit\ProphecyTrait')) {
+    abstract class AbstractTestCase extends TestCase
+    {
+        use \Prophecy\PhpUnit\ProphecyTrait;
+        use WithContainerMockTrait;
+    }
+} else {
+    abstract class AbstractTestCase extends TestCase
+    {
+        use WithContainerMockTrait;
+    }
+}
diff --git a/tests/Argument/ArgumentResolverTest.php b/tests/Argument/ArgumentResolverTest.php
index 53c7b28..ae9a613 100755
--- a/tests/Argument/ArgumentResolverTest.php
+++ b/tests/Argument/ArgumentResolverTest.php
@@ -4,20 +4,17 @@
 
 namespace spaceonfire\Container\Argument;
 
-use PHPUnit\Framework\TestCase;
 use ReflectionMethod;
+use spaceonfire\Container\AbstractTestCase;
 use spaceonfire\Container\ContainerInterface;
 use spaceonfire\Container\Exception\ContainerException;
 use spaceonfire\Container\Fixtures\A;
 use spaceonfire\Container\Fixtures\B;
 use spaceonfire\Container\Fixtures\MyClass;
 use spaceonfire\Container\RawValueHolder;
-use spaceonfire\Container\WithContainerMockTrait;
 
-class ArgumentResolverTest extends TestCase
+class ArgumentResolverTest extends AbstractTestCase
 {
-    use WithContainerMockTrait;
-
     /**
      * @var ArgumentResolver
      */
diff --git a/tests/Argument/ArgumentTest.php b/tests/Argument/ArgumentTest.php
index f67e53f..f3dac7e 100755
--- a/tests/Argument/ArgumentTest.php
+++ b/tests/Argument/ArgumentTest.php
@@ -4,12 +4,12 @@
 
 namespace spaceonfire\Container\Argument;
 
-use PHPUnit\Framework\TestCase;
+use spaceonfire\Container\AbstractTestCase;
 use spaceonfire\Container\ContainerInterface;
 use spaceonfire\Container\Exception\ContainerException;
 use spaceonfire\Container\RawValueHolder;
 
-class ArgumentTest extends TestCase
+class ArgumentTest extends AbstractTestCase
 {
     public function testGetName(): void
     {
diff --git a/tests/CompositeContainerTest.php b/tests/CompositeContainerTest.php
index ed1b69c..6cbe78c 100755
--- a/tests/CompositeContainerTest.php
+++ b/tests/CompositeContainerTest.php
@@ -5,7 +5,6 @@
 namespace spaceonfire\Container;
 
 use ArrayIterator;
-use PHPUnit\Framework\TestCase;
 use Prophecy\Argument;
 use Psr\Container\ContainerInterface as PsrContainerInterface;
 use spaceonfire\Collection\Collection;
@@ -15,10 +14,8 @@
 use spaceonfire\Container\Fixtures\AbstractClass\AcceptNullableAbstractClass;
 use spaceonfire\Container\Fixtures\AbstractClass\RequiresAbstractClass;
 
-class CompositeContainerTest extends TestCase
+class CompositeContainerTest extends AbstractTestCase
 {
-    use WithContainerMockTrait;
-
     public function testHas(): void
     {
         $composite = new CompositeContainer([
diff --git a/tests/ContainerAwareTraitTest.php b/tests/ContainerAwareTraitTest.php
index 4080e6f..c4906ad 100755
--- a/tests/ContainerAwareTraitTest.php
+++ b/tests/ContainerAwareTraitTest.php
@@ -4,10 +4,9 @@
 
 namespace spaceonfire\Container;
 
-use PHPUnit\Framework\TestCase;
 use spaceonfire\Container\Exception\ContainerException;
 
-class ContainerAwareTraitTest extends TestCase
+class ContainerAwareTraitTest extends AbstractTestCase
 {
     private function factory()
     {
diff --git a/tests/ContainerTest.php b/tests/ContainerTest.php
index 1fd634c..6a65b1b 100755
--- a/tests/ContainerTest.php
+++ b/tests/ContainerTest.php
@@ -5,7 +5,6 @@
 namespace spaceonfire\Container;
 
 use InvalidArgumentException;
-use PHPUnit\Framework\TestCase;
 use spaceonfire\Container\Exception\ContainerException;
 use spaceonfire\Container\Exception\NotFoundException;
 use spaceonfire\Container\Fixtures\A;
@@ -14,7 +13,7 @@
 use spaceonfire\Container\Fixtures\MyClass;
 use spaceonfire\Container\Fixtures\MyClassProvider;
 
-class ContainerTest extends TestCase
+class ContainerTest extends AbstractTestCase
 {
     public function testAdd(): void
     {
@@ -104,10 +103,6 @@ public function testInvoke(): void
 
         self::assertSame('bar', $container->invoke(MyClass::class . '::staticMethod'));
 
-        $oldReporting = error_reporting(E_ALL ^ E_DEPRECATED);
-        self::assertSame('foo', $container->invoke([MyClass::class, 'method']));
-        error_reporting($oldReporting);
-
         self::assertSame('foo', $container->invoke([new MyClass(), 'method']));
 
         $invokable = new class {
@@ -118,7 +113,10 @@ public function __invoke()
         };
         self::assertSame(42, $container->invoke($invokable));
 
-        self::assertSame(42, $container->invoke('intval', ['var' => '42', 'base' => 10]));
+        self::assertSame(42, $container->invoke('intval', [
+            (PHP_VERSION_ID >= 80000 ? 'value' : 'var') => '42',
+            'base' => 10,
+        ]));
     }
 
     public function testResolveDefinitionWithParentContainer(): void
diff --git a/tests/Definition/DefinitionAggregateTest.php b/tests/Definition/DefinitionAggregateTest.php
index bc1dd4a..3d8bc9f 100755
--- a/tests/Definition/DefinitionAggregateTest.php
+++ b/tests/Definition/DefinitionAggregateTest.php
@@ -4,11 +4,11 @@
 
 namespace spaceonfire\Container\Definition;
 
-use PHPUnit\Framework\TestCase;
+use spaceonfire\Container\AbstractTestCase;
 use spaceonfire\Container\ContainerInterface;
 use spaceonfire\Container\Exception\ContainerException;
 
-class DefinitionAggregateTest extends TestCase
+class DefinitionAggregateTest extends AbstractTestCase
 {
     public function testConstruct(): void
     {
diff --git a/tests/Definition/DefinitionTest.php b/tests/Definition/DefinitionTest.php
index 3151dfd..91cd9db 100755
--- a/tests/Definition/DefinitionTest.php
+++ b/tests/Definition/DefinitionTest.php
@@ -4,16 +4,17 @@
 
 namespace spaceonfire\Container\Definition;
 
-use PHPUnit\Framework\TestCase;
 use Prophecy\Argument as ArgumentProphecy;
+use spaceonfire\Container\AbstractTestCase;
 use spaceonfire\Container\Argument\Argument;
 use spaceonfire\Container\ContainerInterface;
 use spaceonfire\Container\Exception\ContainerException;
 use spaceonfire\Container\RawValueHolder;
 use stdClass;
 
-class DefinitionTest extends TestCase
+class DefinitionTest extends AbstractTestCase
 {
+
     public function testGetters(): void
     {
         $foo = new Definition('foo');
diff --git a/tests/Reflection/ReflectionFactoryTest.php b/tests/Reflection/ReflectionFactoryTest.php
index 59b3c79..1bd78f2 100755
--- a/tests/Reflection/ReflectionFactoryTest.php
+++ b/tests/Reflection/ReflectionFactoryTest.php
@@ -4,18 +4,15 @@
 
 namespace spaceonfire\Container\Reflection;
 
-use PHPUnit\Framework\TestCase;
+use spaceonfire\Container\AbstractTestCase;
 use spaceonfire\Container\Argument\ArgumentResolver;
 use spaceonfire\Container\ContainerInterface;
 use spaceonfire\Container\Exception\NotFoundException;
 use spaceonfire\Container\Fixtures\A;
 use spaceonfire\Container\Fixtures\B;
-use spaceonfire\Container\WithContainerMockTrait;
 
-class ReflectionFactoryTest extends TestCase
+class ReflectionFactoryTest extends AbstractTestCase
 {
-    use WithContainerMockTrait;
-
     /**
      * @var ReflectionFactory
      */
diff --git a/tests/Reflection/ReflectionInvokerTest.php b/tests/Reflection/ReflectionInvokerTest.php
index 6f7509e..94d28c9 100755
--- a/tests/Reflection/ReflectionInvokerTest.php
+++ b/tests/Reflection/ReflectionInvokerTest.php
@@ -4,18 +4,15 @@
 
 namespace spaceonfire\Container\Reflection;
 
-use PHPUnit\Framework\TestCase;
+use spaceonfire\Container\AbstractTestCase;
 use spaceonfire\Container\Argument\ArgumentResolver;
 use spaceonfire\Container\ContainerInterface;
 use spaceonfire\Container\Fixtures\A;
 use spaceonfire\Container\Fixtures\B;
 use spaceonfire\Container\Fixtures\MyClass;
-use spaceonfire\Container\WithContainerMockTrait;
 
-class ReflectionInvokerTest extends TestCase
+class ReflectionInvokerTest extends AbstractTestCase
 {
-    use WithContainerMockTrait;
-
     /**
      * @var ReflectionInvoker
      */
@@ -46,16 +43,13 @@ protected function setUp(): void
      */
     public function testInvoker($expect, $callable, $arguments = []): void
     {
-        $oldReporting = error_reporting(E_ALL ^ E_DEPRECATED);
         self::assertSame($expect, ($this->invoker)($callable, $arguments));
-        error_reporting($oldReporting);
     }
 
     public function dataProvider(): array
     {
         return [
             ['bar', MyClass::class . '::staticMethod'],
-            ['foo', [MyClass::class, 'method']],
             ['foo', [new MyClass(), 'method']],
             [42, new class {
                 public function __invoke()
@@ -63,7 +57,10 @@ public function __invoke()
                     return 42;
                 }
             }],
-            [42, 'intval', ['var' => '42', 'base' => 10]],
+            [42, 'intval', [
+                (PHP_VERSION_ID >= 80000 ? 'value' : 'var') => '42',
+                'base' => 10,
+            ]],
         ];
     }
 }
diff --git a/tests/ReflectionContainerTest.php b/tests/ReflectionContainerTest.php
index 1f15605..90b101c 100755
--- a/tests/ReflectionContainerTest.php
+++ b/tests/ReflectionContainerTest.php
@@ -5,7 +5,6 @@
 namespace spaceonfire\Container;
 
 use BadMethodCallException;
-use PHPUnit\Framework\TestCase;
 use spaceonfire\Container\Exception\ContainerException;
 use spaceonfire\Container\Exception\NotFoundException;
 use spaceonfire\Container\Fixtures\A;
@@ -14,7 +13,7 @@
 use spaceonfire\Container\Fixtures\B;
 use spaceonfire\Container\Fixtures\MyClass;
 
-class ReflectionContainerTest extends TestCase
+class ReflectionContainerTest extends AbstractTestCase
 {
     public function testHas(): void
     {
@@ -44,10 +43,6 @@ public function testInvoke(): void
 
         self::assertSame('bar', $container->invoke(MyClass::class . '::staticMethod'));
 
-        $oldReporting = error_reporting(E_ALL ^ E_DEPRECATED);
-        self::assertSame('foo', $container->invoke([MyClass::class, 'method']));
-        error_reporting($oldReporting);
-
         self::assertSame('foo', $container->invoke([new MyClass(), 'method']));
 
         $invokable = new class {
@@ -58,7 +53,10 @@ public function __invoke()
         };
         self::assertSame(42, $container->invoke($invokable));
 
-        self::assertSame(42, $container->invoke('intval', ['var' => '42', 'base' => 10]));
+        self::assertSame(42, $container->invoke('intval', [
+            (PHP_VERSION_ID >= 80000 ? 'value' : 'var') => '42',
+            'base' => 10,
+        ]));
     }
 
     public function testAdd(): void
diff --git a/tests/ServiceProvider/ServiceProviderAggregateTest.php b/tests/ServiceProvider/ServiceProviderAggregateTest.php
index dde11fc..471001e 100755
--- a/tests/ServiceProvider/ServiceProviderAggregateTest.php
+++ b/tests/ServiceProvider/ServiceProviderAggregateTest.php
@@ -4,13 +4,13 @@
 
 namespace spaceonfire\Container\ServiceProvider;
 
-use PHPUnit\Framework\TestCase;
 use Prophecy\Argument;
+use spaceonfire\Container\AbstractTestCase;
 use spaceonfire\Container\ContainerInterface;
 use spaceonfire\Container\Definition\Definition;
 use spaceonfire\Container\Exception\ContainerException;
 
-class ServiceProviderAggregateTest extends TestCase
+class ServiceProviderAggregateTest extends AbstractTestCase
 {
     private function createAggregate(?ContainerInterface $container = null): ServiceProviderAggregate
     {