diff --git a/composer.json b/composer.json
index 8b8ab66..1f36917 100644
--- a/composer.json
+++ b/composer.json
@@ -14,11 +14,11 @@
     "homepage": "https://github.com/theorchard/monolog-cascade",
     "require": {
         "php": ">=5.3.9",
-        "symfony/config": "~2.7.0",
-        "symfony/options-resolver": "~2.7.0",
-        "symfony/serializer": "~2.7.0",
-        "symfony/yaml": "~2.7.0",
-        "monolog/monolog": "~1.14"
+        "symfony/config": "~2.8",
+        "symfony/options-resolver": "~2.8",
+        "symfony/serializer": "~2.8",
+        "symfony/yaml": "~2.8",
+        "monolog/monolog": "~1.17"
     },
     "autoload": {
         "psr-4": {
@@ -31,14 +31,12 @@
         }
     },
     "require-dev": {
-        "mikey179/vfsStream": "~1.4",
+        "mikey179/vfsStream": "~1.6",
         "phpunit/phpcov": "~2.0",
-        "phpunit/phpunit": "~4.7",
-        "phpunit/phpunit-mock-objects": "2.3.0",
-        "satooshi/php-coveralls": "~0.6",
-        "squizlabs/php_codesniffer": "~2.3"
+        "phpunit/phpunit": "~4.8",
+        "satooshi/php-coveralls": "~1.0",
+        "squizlabs/php_codesniffer": "~2.5"
     },
-    "_": "phpunit/phpunit-mock-objects required in 2.3.0 due to https://github.com/sebastianbergmann/phpunit-mock-objects/issues/223",
     "prefer-stable": true,
     "extra": {
         "branch-alias": {