diff --git a/.gitignore b/.gitignore
index 0e36ec8..e34b188 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 /vendor
 /composer.lock
 /.idea
+/.php_cs.cache
diff --git a/.php_cs b/.php_cs
new file mode 100644
index 0000000..21763f7
--- /dev/null
+++ b/.php_cs
@@ -0,0 +1,9 @@
+<?php
+
+return \PhpCsFixer\Config::create()
+    ->setRiskyAllowed(true)
+    ->setRules([
+        '@Symfony' => true,
+        '@Symfony:risky' => true,
+    ])
+    ->setFinder(PhpCsFixer\Finder::create()->files()->in([__DIR__ . '/src', __DIR__ . '/tests'])->name('*.php'));
diff --git a/composer.json b/composer.json
index d347b6b..703d2b1 100644
--- a/composer.json
+++ b/composer.json
@@ -20,7 +20,8 @@
     "require-dev": {
         "phpunit/phpunit": "^7.5.15|^8.5",
         "php-coveralls/php-coveralls": "^2.2",
-        "vimeo/psalm": "^3.5"
+        "vimeo/psalm": "^3.5",
+        "friendsofphp/php-cs-fixer": "^2.6"
     },
     "autoload": {
         "psr-4": {