diff --git a/composer.json b/composer.json
index a343c03..90e6263 100644
--- a/composer.json
+++ b/composer.json
@@ -18,11 +18,11 @@
     "homepage": "https://github.com/theorchard/monolog-cascade",
     "require": {
         "php": "^7.3 || ^8.0",
-        "symfony/config": "^2.7 || ^3.0 || ^4.0 || ^5.0",
-        "symfony/options-resolver": "^2.7 || ^3.0 || ^4.0 || ^5.0",
-        "symfony/serializer": "^2.7 || ^3.0 || ^4.0 || ^5.0",
-        "symfony/yaml": "^3.0 || ^4.0 || ^5.0",
-        "monolog/monolog": "^1.13"
+        "symfony/config": "^2.7 || ^3.0 || ^4.0 || ^5.0 || ^6",
+        "symfony/options-resolver": "^2.7 || ^3.0 || ^4.0 || ^5.0 || ^6",
+        "symfony/serializer": "^2.7 || ^3.0 || ^4.0 || ^5.0 || ^6",
+        "symfony/yaml": "^3.0 || ^4.0 || ^5.0 || ^6",
+        "monolog/monolog": "^1.13 || ^2 || ^3"
     },
     "autoload": {
         "psr-4": {