diff --git a/composer.json b/composer.json
index 1079bae..6b0c141 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
     "require": {
         "php"             : ">=5.3.0",
         "monolog/monolog" : "~1.6",
-        "symfony/yaml"    : "~2.3|~3.0"
+        "symfony/yaml"    : "~2.3|~3.0|~4.0"
     },
     "autoload": {
         "psr-4": { "EasyCorp\\EasyLog\\": "src" }