diff --git a/composer.json b/composer.json
index d18e26ab..edf2e1b7 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
         }
     ],
     "require": {
-        "php": ">=5.5",
+        "php": "^5.5 || ^7.0",
         "php-http/client-implementation": "^1.0",
         "php-http/message-factory": "^1.0.2",
         "php-http/client-common": "^1.2",
@@ -27,16 +27,16 @@
         "symfony/event-dispatcher": "^2.7 || ^3.0",
         "symfony/framework-bundle": "^2.7 || ^3.0",
         "php-http/message": "^1.3",
-        "php-http/discovery": "^0.9",
-        "twig/twig": "^1.18||^2.0"
+        "php-http/discovery": "^1.0",
+        "twig/twig": "^1.18 || ^2.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^4.5",
         "php-http/curl-client": "^1.0",
         "php-http/socket-client": "^1.0",
         "php-http/guzzle6-adapter": "^1.1.1",
-        "php-http/react-adapter": "^0.2",
-        "php-http/buzz-adapter": "^0.2",
+        "php-http/react-adapter": "^0.2.1",
+        "php-http/buzz-adapter": "^0.3",
         "symfony/symfony": "^2.7 || ^3.0",
         "polishsymfonycommunity/symfony-mocker-container": "^1.0",
         "matthiasnoback/symfony-dependency-injection-test": "^0.7"