diff --git a/composer.json b/composer.json
index a071716..847be00 100644
--- a/composer.json
+++ b/composer.json
@@ -26,7 +26,9 @@
     "require-dev": {
         "symfony/phpunit-bridge": "^4.4.0 || ^5.0 || ^6.0",
         "symfony/templating": "^4.0|^5.0|^6.0",
-        "phpunit/phpunit": "^9.5"
+        "phpunit/phpunit": "^9.5",
+        "phpstan/phpstan": "^1.2",
+        "phpstan/phpstan-symfony": "^1.0"
     },
     "suggest": {
         "symfony/twig-bundle": "to use the Twig markdown filter"