diff --git a/composer.json b/composer.json
index 38d7dd89f4ddcdfa63dea5dcf954cf6720249167..fef28b10dc5a18ca448228c13b043eec9a37f1c0 100644
--- a/composer.json
+++ b/composer.json
@@ -46,8 +46,8 @@
 		"cogpowered/finediff": "~0.3.1"
 	},
 	"require-dev": {
-		"mikey179/vfsStream": "1.4.*@dev",
-		"phpunit/phpunit": "~4.8.0"
+		"phpunit/phpunit": "~4.8.0",
+		"mikey179/vfsStream": "1.6.0"
 	},
 	"suggest": {
 		"ext-gd": "GDlib/Freetype is required for building images with text (GIFBUILDER) and can also be used to scale images",
diff --git a/composer.lock b/composer.lock
index 509b6420e996db7b2b8dfb8fc7001869b318eb40..60f77aa0a6e12b57837f1bd6fefbe44c9575d52f 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,8 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "hash": "9ec4dcb3b06b158e39b165b3236fa0f0",
+    "hash": "86c884e10a0b730855e327edfd19fd02",
+    "content-hash": "2988051bfeacaa2d95da8d796d9c5bd8",
     "packages": [
         {
             "name": "cogpowered/finediff",
@@ -706,28 +707,28 @@
     "packages-dev": [
         {
             "name": "mikey179/vfsStream",
-            "version": "v1.4.0",
+            "version": "v1.6.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/mikey179/vfsStream.git",
-                "reference": "61b12172292cf539685507aa65b076c1530e83c1"
+                "reference": "73bcb605b741a7d5044b47592338c633788b0eb7"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/mikey179/vfsStream/zipball/61b12172292cf539685507aa65b076c1530e83c1",
-                "reference": "61b12172292cf539685507aa65b076c1530e83c1",
+                "url": "https://api.github.com/repos/mikey179/vfsStream/zipball/73bcb605b741a7d5044b47592338c633788b0eb7",
+                "reference": "73bcb605b741a7d5044b47592338c633788b0eb7",
                 "shasum": ""
             },
             "require": {
                 "php": ">=5.3.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "~4.2"
+                "phpunit/phpunit": "~4.5"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.4.x-dev"
+                    "dev-master": "1.6.x-dev"
                 }
             },
             "autoload": {
@@ -737,10 +738,18 @@
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
-                "BSD"
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Frank Kleine",
+                    "homepage": "http://frankkleine.de/",
+                    "role": "Developer"
+                }
             ],
+            "description": "Virtual file system to mock the real file system in unit tests.",
             "homepage": "http://vfs.bovigo.org/",
-            "time": "2014-09-14 10:18:53"
+            "time": "2015-10-06 16:59:57"
         },
         {
             "name": "phpdocumentor/reflection-docblock",
@@ -1643,8 +1652,7 @@
     "aliases": [],
     "minimum-stability": "stable",
     "stability-flags": {
-        "psr/log": 20,
-        "mikey179/vfsstream": 20
+        "psr/log": 20
     },
     "prefer-stable": false,
     "prefer-lowest": false,