diff --git a/composer.json b/composer.json
index 7e1ca42..70998af 100644
--- a/composer.json
+++ b/composer.json
@@ -13,7 +13,7 @@
         "symfony/config": "^3.4",
         "symfony/console": "^3.4",
         "symfony/dependency-injection": "^3.4",
-        "symfony/filesystem": "^3.4",
+        "symfony/filesystem": "^3.4 || ^4.0",
         "symfony/yaml": "^3.4",
         "tightenco/collect": "^5.4"
     },