diff --git a/composer.json b/composer.json
index f6be386..4f10eab 100644
--- a/composer.json
+++ b/composer.json
@@ -13,13 +13,13 @@
         }
     ],
     "require": {
-        "php"           : "^7.1",
+        "php"           : "^7.1 || ^8.0",
         "sabre/dav"     : "~4.1.2",
         "twig/twig"     : "~2.12.5",
         "symfony/yaml"  : "^3.4"
     },
     "require-dev" : {
-        "friendsofphp/php-cs-fixer": "~2.16.7"
+        "friendsofphp/php-cs-fixer": "^2.17"
     },
     "replace" : {
         "jeromeschneider/baikal" : "self.version"