diff --git a/composer.json b/composer.json
index e869ab8..1f63e69 100644
--- a/composer.json
+++ b/composer.json
@@ -38,7 +38,7 @@
         "ext-SPL": "*",
         "composer-plugin-api": "^1.10 || ^2",
         "composer/installers": "^1.12.0 || ^2",
-        "symfony/dotenv": "^3.4 || ^5"
+        "symfony/dotenv": "^3.4 || ^5 || ^6"
     },
     "require-dev": {
         "roave/security-advisories": "dev-latest",