diff --git a/composer.json b/composer.json
index 3082761..b6f1a1b 100644
--- a/composer.json
+++ b/composer.json
@@ -22,11 +22,11 @@
     "phpunit/phpunit": "^5.4",
     "monolog/monolog": "^1.3",
     "symfony/http-foundation": "^3.0",
-    "symfony/validator": "^3.0"
+    "symfony/validator": "^4.3"
   },
   "suggest": {
     "monolog/monolog": "^1.3",
     "symfony/http-foundation": "^3.0",
-    "symfony/validator": "^3.0"
+    "symfony/validator": "^4.3"
   }
 }