diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 92faeb3c..fa4a5825 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -155,6 +155,10 @@ jobs:
                 name: Validate composer.json
                 run: composer validate --ansi --strict
 
+            -
+                name: Run ECS
+                run: vendor/bin/ecs check src/ spec/
+
             -
                 name: Run PHPStan
                 run: vendor/bin/phpstan analyse -c phpstan.neon -l max src/
diff --git a/composer.json b/composer.json
index dfb3bf09..a1d9ced9 100644
--- a/composer.json
+++ b/composer.json
@@ -46,7 +46,7 @@
         "phpstan/phpstan": "0.12.84",
         "phpstan/phpstan-webmozart-assert": "0.12.12",
         "phpunit/phpunit": "^9.5",
-        "sylius-labs/coding-standard": "^3.2",
+        "sylius-labs/coding-standard": "^4.0",
         "symfony/browser-kit": "^4.4 || ^5.2",
         "symfony/debug-bundle": "^4.4 || ^5.2",
         "symfony/dotenv": "^4.4 || ^5.2",
@@ -64,13 +64,11 @@
             "Tests\\Sylius\\RefundPlugin\\Application\\": "tests/Application/src/"
         }
     },
-    "conflict": {
-        "symplify/package-builder": "8.3.25"
-    },
     "scripts": {
         "analyse": [
             "@composer validate --strict",
-            "vendor/bin/phpstan analyse -c phpstan.neon -l max src/"
+            "vendor/bin/phpstan analyse -c phpstan.neon -l max src/",
+            "vendor/bin/ecs check src/ spec/"
         ],
         "fix": [
             "vendor/bin/ecs check src/ spec/ --fix"
diff --git a/easy-coding-standard.yml b/easy-coding-standard.yml
deleted file mode 100644
index d1d90925..00000000
--- a/easy-coding-standard.yml
+++ /dev/null
@@ -1,6 +0,0 @@
-imports:
-    - { resource: 'vendor/sylius-labs/coding-standard/easy-coding-standard.yml' }
-
-parameters:
-    skip:
-        SlevomatCodingStandard\Sniffs\Commenting\InlineDocCommentDeclarationSniff.MissingVariable: ~
diff --git a/ecs.php b/ecs.php
new file mode 100644
index 00000000..af3d5818
--- /dev/null
+++ b/ecs.php
@@ -0,0 +1,15 @@
+<?php
+
+use SlevomatCodingStandard\Sniffs\Commenting\InlineDocCommentDeclarationSniff;
+use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;
+use Symplify\EasyCodingStandard\ValueObject\Option;
+
+return static function (ContainerConfigurator $containerConfigurator): void
+{
+    $containerConfigurator->import('vendor/sylius-labs/coding-standard/ecs.php');
+
+    $containerConfigurator->parameters()->set(Option::SKIP, [
+        InlineDocCommentDeclarationSniff::class . '.MissingVariable',
+        '**/var/*',
+    ]);
+};