diff --git a/composer.json b/composer.json
index b40f9be8..e0dc5569 100644
--- a/composer.json
+++ b/composer.json
@@ -13,12 +13,12 @@
     ],
     "require": {
         "php": ">=5.4.0",
-        "ext-fileinfo": "*"
+        "ext-fileinfo": "*",
+        "guzzlehttp/psr7": "~1.1"
     },
     "require-dev": {
         "phpunit/phpunit": "3.*",
-        "mockery/mockery": "~0.9.2",
-        "guzzlehttp/psr7": "~1.1"
+        "mockery/mockery": "~0.9.2"
     },
     "suggest": {
         "ext-gd": "to use GD library based image processing.",