diff --git a/composer.json b/composer.json
index a91d6c1..b848e75 100644
--- a/composer.json
+++ b/composer.json
@@ -29,8 +29,8 @@
     "require": {
         "php"                 : ">=5.5",
         "evenement/evenement" : "^3.0|^2.0|^1.0",
-        "psr/log"             : "^1.0",
-        "symfony/process"     : "^2.3|^3.0|^4.0|^5.0"
+        "psr/log"             : "^1.0|^2.0|^3.0",
+        "symfony/process"     : "^2.3|^3.0|^4.0|^5.0|^6.0"
     },
     "require-dev": {
         "phpunit/phpunit"     : "^4.0|^5.0"