diff --git a/.travis.yml b/.travis.yml
index 8273ef10..d339bfba 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,7 +16,6 @@ before_install:
     - composer self-update --no-interaction
 
 install:
-    - composer require php-http/guzzle6-adapter
     - composer install --prefer-dist --no-interaction
 
 script:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c7d450c9..e8e34110 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+# 4.0.0 (2018-02-12)
+
+## BC Breaks
+
+Drop support for PHP 5.6, PHP 7.0 and PHP 7.1
+
 # 2.0.1 (2018-05-03)
 
 ## Improvements
diff --git a/composer.json b/composer.json
index a91eb005..60e28e54 100644
--- a/composer.json
+++ b/composer.json
@@ -34,7 +34,8 @@
     "phpunit/phpunit": "^5.7",
     "phpspec/phpspec": "^5.0",
     "symfony/yaml": "^4.2",
-    "donatj/mock-webserver": "^2.0"
+    "donatj/mock-webserver": "^2.0",
+    "php-http/guzzle6-adapter": "^2.0"
   },
   "config": {
     "bin-dir": "bin"