diff --git a/.travis.yml b/.travis.yml
index 7ee1f9c..8f3630e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,6 +10,7 @@ php:
     - 7.2
     - 7.3
     - 7.4
+    - 8.0snapshot
 
 env:
     global:
diff --git a/composer.json b/composer.json
index 6f60d01..0255840 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,7 @@
         }
     ],
     "require": {
-        "php": "^7.2",
+        "php": "^7.2 || ^8.0",
         "guzzlehttp/psr7": "^1.7",
         "php-http/client-common": "^2.0",
         "psr/log": "^1.1",
@@ -20,7 +20,6 @@
     },
     "require-dev": {
         "symfony/phpunit-bridge": "^4.2|^5.0",
-        "friendsofphp/php-cs-fixer": "^2.14",
         "phpstan/phpstan": "^0.12.57"
     },
     "autoload": {