diff --git a/composer.json b/composer.json
index d6d42c8..5f88540 100644
--- a/composer.json
+++ b/composer.json
@@ -13,7 +13,7 @@
         "symfony/options-resolver": "^3.4",
         "symfony/expression-language": "^3.4",
         "symfony/dependency-injection": "^3.4",
-        "symfony/validator": "^3.4",
+        "symfony/validator": "^4.0",
         "symfony/proxy-manager-bridge": "^3.4",
         "symfony/doctrine-bridge": "^3.4",
         "symfony/twig-bridge": "^3.4",