diff --git a/composer.json b/composer.json
index aaeda67..87a1473 100644
--- a/composer.json
+++ b/composer.json
@@ -21,10 +21,10 @@
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-    "symfony/process": "^2.8 | ^3.2 | ^4.0",
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@@ -32,7 +32,7 @@
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-    "symfony/console": "^3.1 | ^4 | ^5",
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@@ -53,7 +53,7 @@
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+      "php": "7.4"
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diff --git a/composer.lock b/composer.lock
index 2ac040a..54b75ab 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
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@@ -58,6 +58,10 @@
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@@ -113,20 +117,74 @@
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+                    "homepage": "http://www.php-fig.org/"
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+            "keywords": [
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+                "psr",
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+                "source": "https://github.com/php-fig/event-dispatcher/tree/1.0.0"
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-                "reference": "6c001f1daafa3a3ac1d8ff69ee4db8e799a654dd"
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@@ -135,7 +193,7 @@
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@@ -150,7 +208,7 @@
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-                    "homepage": "http://www.php-fig.org/"
+                    "homepage": "https://www.php-fig.org/"
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@@ -160,48 +218,41 @@
                 "psr",
                 "psr-3"
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-            "time": "2018-11-20T15:27:04+00:00"
+            "support": {
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+            },
+            "time": "2021-05-03T11:20:27+00:00"
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-            "version": "v1.0.2",
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-                "symfony/cache-contracts-implementation": "",
-                "symfony/service-contracts-implementation": "",
-                "symfony/translation-contracts-implementation": ""
+                "php": ">=7.1"
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@@ -218,56 +269,69 @@
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-                "contracts",
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-                "symfony/stopwatch": "~3.4|~4.0"
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+                "symfony/expression-language": "^4.4|^5.0|^6.0",
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@@ -290,33 +354,209 @@
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-            "description": "Symfony EventDispatcher Component",
+            "description": "Provides tools that allow your application components to communicate with each other by dispatching events and listening to them",
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-            "time": "2019-01-16T20:35:37+00:00"
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-            "version": "v4.2.3",
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+                    "email": "p@tchwork.com"
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+                    "homepage": "https://symfony.com/contributors"
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@@ -339,9 +579,30 @@
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-            "description": "Symfony Process Component",
+            "description": "Executes commands in sub-processes",
             "homepage": "https://symfony.com",
-            "time": "2019-01-24T22:05:03+00:00"
+            "support": {
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+                    "url": "https://symfony.com/sponsor",
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@@ -468,20 +729,24 @@
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@@ -505,24 +770,28 @@
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+            "support": {
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+            },
+            "require": {
+                "php": ">=7.1.3",
+                "psr/container": "^1.0"
+            },
+            "suggest": {
+                "symfony/service-implementation": ""
+            },
+            "type": "library",
+            "extra": {
+                "thanks": {
+                    "url": "https://github.com/symfony/contracts",
+                    "name": "symfony/contracts"
+                },
+                "branch-alias": {
+                    "dev-main": "1.1-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Contracts\\Service\\": ""
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Generic abstractions related to writing services",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "abstractions",
+                "contracts",
+                "decoupling",
+                "interfaces",
+                "interoperability",
+                "standards"
+            ],
+            "support": {
+                "source": "https://github.com/symfony/service-contracts/tree/v1.10.0"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2022-05-27T14:01:05+00:00"
         },
         {
             "name": "theseer/tokenizer",
@@ -2216,11 +2774,11 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": "^5.5 | ^7.0"
+        "php": "^7.4"
     },
     "platform-dev": {},
     "platform-overrides": {
-        "php": "7.2"
+        "php": "7.4"
     },
-    "plugin-api-version": "2.6.0"
+    "plugin-api-version": "2.9.0"
 }
diff --git a/src/Event/EventDispatcherTrait.php b/src/Event/EventDispatcherTrait.php
index 358df99..1455c7d 100644
--- a/src/Event/EventDispatcherTrait.php
+++ b/src/Event/EventDispatcherTrait.php
@@ -13,9 +13,9 @@
 
 namespace Graze\ParallelProcess\Event;
 
-use Symfony\Component\EventDispatcher\Event;
 use Symfony\Component\EventDispatcher\EventDispatcher;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Contracts\EventDispatcher\Event;
 
 trait EventDispatcherTrait
 {
@@ -60,7 +60,7 @@ public function addListener($name, callable $handler)
     protected function dispatch($name, Event $event)
     {
         $this->assertEventName($name);
-        $this->getEventDispatcher()->dispatch($name, $event);
+        $this->getEventDispatcher()->dispatch($event, $name);
         return $this;
     }
 
diff --git a/src/Event/PriorityChangedEvent.php b/src/Event/PriorityChangedEvent.php
index b609c1e..adcaa6d 100644
--- a/src/Event/PriorityChangedEvent.php
+++ b/src/Event/PriorityChangedEvent.php
@@ -14,7 +14,7 @@
 namespace Graze\ParallelProcess\Event;
 
 use Graze\ParallelProcess\PrioritisedInterface;
-use Symfony\Component\EventDispatcher\Event;
+use Symfony\Contracts\EventDispatcher\Event;
 
 class PriorityChangedEvent extends Event
 {
diff --git a/src/Event/RunEvent.php b/src/Event/RunEvent.php
index 397b3dd..c4f0c72 100644
--- a/src/Event/RunEvent.php
+++ b/src/Event/RunEvent.php
@@ -14,7 +14,7 @@
 namespace Graze\ParallelProcess\Event;
 
 use Graze\ParallelProcess\RunInterface;
-use Symfony\Component\EventDispatcher\Event;
+use Symfony\Contracts\EventDispatcher\Event;
 
 class RunEvent extends Event
 {
diff --git a/tests/src/EventDispatcherFake.php b/tests/src/EventDispatcherFake.php
index 52e7d99..4b406d4 100644
--- a/tests/src/EventDispatcherFake.php
+++ b/tests/src/EventDispatcherFake.php
@@ -14,7 +14,7 @@
 namespace Graze\ParallelProcess\Test;
 
 use Graze\ParallelProcess\Event\EventDispatcherTrait;
-use Symfony\Component\EventDispatcher\Event;
+use Symfony\Contracts\EventDispatcher\Event;
 
 class EventDispatcherFake
 {
diff --git a/tests/unit/CallbackRunTest.php b/tests/unit/CallbackRunTest.php
index 454fcb5..a51d22e 100644
--- a/tests/unit/CallbackRunTest.php
+++ b/tests/unit/CallbackRunTest.php
@@ -176,7 +176,7 @@ public function testEventsProvideDurationAndLastMessage()
             RunEvent::UPDATED,
             function (RunEvent $event) use (&$run, &$hits) {
                 $this->assertSame($event->getRun(), $run);
-                $this->assertInternalType('float', $run->getDuration());
+                $this->assertIsFloat($run->getDuration());
                 $this->assertContains($run->getLastMessage(), ['line 1', 'line 2']);
                 $hits++;
             }
diff --git a/tests/unit/Display/LinesTest.php b/tests/unit/Display/LinesTest.php
index 6266194..8784247 100644
--- a/tests/unit/Display/LinesTest.php
+++ b/tests/unit/Display/LinesTest.php
@@ -35,7 +35,7 @@ class LinesTest extends TestCase
     /** @var Lines */
     private $lines;
 
-    public function setUp()
+    public function setUp(): void
     {
         mb_internal_encoding("UTF-8");
         $this->bufferOutput = new BufferDiffOutput();
diff --git a/tests/unit/Display/TableTest.php b/tests/unit/Display/TableTest.php
index 2349dd3..9ce4432 100644
--- a/tests/unit/Display/TableTest.php
+++ b/tests/unit/Display/TableTest.php
@@ -35,7 +35,7 @@ class TableTest extends TestCase
     /** @var Table */
     private $table;
 
-    public function setUp()
+    public function setUp(): void
     {
         mb_internal_encoding("UTF-8");
         $this->bufferOutput = new BufferDiffOutput();
diff --git a/tests/unit/Event/EventDispatcherTest.php b/tests/unit/Event/EventDispatcherTest.php
index 4bb63eb..9cef502 100644
--- a/tests/unit/Event/EventDispatcherTest.php
+++ b/tests/unit/Event/EventDispatcherTest.php
@@ -15,14 +15,14 @@
 
 use Graze\ParallelProcess\Test\EventDispatcherFake;
 use Graze\ParallelProcess\Test\TestCase;
-use Symfony\Component\EventDispatcher\Event;
+use Symfony\Contracts\EventDispatcher\Event;
 
 class EventDispatcherTest extends TestCase
 {
     /** @var EventDispatcherFake */
     private $dispatcher;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->dispatcher = new EventDispatcherFake();
     }
diff --git a/tests/unit/Monitor/PoolLoggerTest.php b/tests/unit/Monitor/PoolLoggerTest.php
index cadb703..baee90c 100644
--- a/tests/unit/Monitor/PoolLoggerTest.php
+++ b/tests/unit/Monitor/PoolLoggerTest.php
@@ -27,7 +27,7 @@ class PoolLoggerTest extends TestCase
     /** @var PoolLogger */
     private $monitor;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->logger = new BufferedLogger();
         $this->monitor = new PoolLogger($this->logger);
diff --git a/tests/unit/PoolMaxSimultaneousTest.php b/tests/unit/PoolMaxSimultaneousTest.php
index e54fd04..a78a7ba 100644
--- a/tests/unit/PoolMaxSimultaneousTest.php
+++ b/tests/unit/PoolMaxSimultaneousTest.php
@@ -25,7 +25,7 @@ class PoolMaxSimultaneousTest extends TestCase
     /** @var mixed */
     private $process;
 
-    public function setUp()
+    public function setUp(): void
     {
         parent::setUp();
 
diff --git a/tests/unit/PoolTest.php b/tests/unit/PoolTest.php
index 000d3b3..689af2c 100644
--- a/tests/unit/PoolTest.php
+++ b/tests/unit/PoolTest.php
@@ -31,7 +31,7 @@ class PoolTest extends TestCase
     /** @var mixed */
     private $process;
 
-    public function setUp()
+    public function setUp(): void
     {
         parent::setUp();
 
diff --git a/tests/unit/PriorityPoolTest.php b/tests/unit/PriorityPoolTest.php
index 82ead14..e4ef35f 100644
--- a/tests/unit/PriorityPoolTest.php
+++ b/tests/unit/PriorityPoolTest.php
@@ -30,7 +30,7 @@ class PriorityPoolTest extends TestCase
     /** @var mixed */
     private $process;
 
-    public function setUp()
+    public function setUp(): void
     {
         parent::setUp();
 
diff --git a/tests/unit/ProcessRunTest.php b/tests/unit/ProcessRunTest.php
index 1a30345..2f3566a 100644
--- a/tests/unit/ProcessRunTest.php
+++ b/tests/unit/ProcessRunTest.php
@@ -256,7 +256,7 @@ function (callable $fn) {
             RunEvent::UPDATED,
             function (RunEvent $event) use (&$run, &$hits) {
                 $this->assertSame($event->getRun(), $run);
-                $this->assertInternalType('float', $run->getDuration());
+                $this->assertIsFloat($run->getDuration());
                 $this->assertEquals('some text', $run->getLastMessage());
                 $this->assertEquals(Process::OUT, $run->getLastMessageType());
                 $hits++;
@@ -294,7 +294,7 @@ function (callable $fn) {
             RunEvent::UPDATED,
             function (RunEvent $event) use (&$run, &$hits) {
                 $this->assertSame($event->getRun(), $run);
-                $this->assertInternalType('float', $run->getDuration());
+                $this->assertIsFloat($run->getDuration());
                 $this->assertContains($run->getLastMessage(), ['line 1', 'line 2']);
                 $this->assertEquals(Process::OUT, $run->getLastMessageType());
                 $hits++;