diff --git a/.travis.yml b/.travis.yml
index deadd3c..89b97e5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,6 +10,8 @@ php:
     - 7.2
     - 7.3
     - 7.4
+    - 8.0
+    - 8.1
 
 env:
     global:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 371e057..71467bb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Change Log
 
+## 2.0.4
+
+ * Add Symfony 6 compatibility
+
 ## 2.0.3
 
  * Add php 8 compatibility
diff --git a/composer.json b/composer.json
index a876b15..c1b66da 100644
--- a/composer.json
+++ b/composer.json
@@ -13,14 +13,14 @@
         "nyholm/psr7": "^1.3",
         "php-http/httplug": "^2.0",
         "psr/http-client": "^1.0",
-        "symfony/options-resolver": "^2.6 || ^3.4 || ^4.4 || ^5.0"
+        "symfony/options-resolver": "^2.6 || ^3.4 || ^4.4 || ^5.0 || ^6.0"
     },
     "require-dev": {
-        "friendsofphp/php-cs-fixer": "^2.2",
+        "friendsofphp/php-cs-fixer": "^2.2 || ^3.0",
         "php-http/client-integration-tests": "^3.0",
         "php-http/message": "^1.9",
         "php-http/client-common": "^2.3",
-        "phpunit/phpunit": "^8.5.8"
+        "phpunit/phpunit": "^8.5.8 || ~9.5"
     },
     "provide": {
         "php-http/client-implementation": "1.0",