diff --git a/composer.json b/composer.json
index bc787f9..392cfdd 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
 
     },
     "require-dev": {
-        "phpunit/phpunit": "4.*"
+        "phpunit/phpunit": "4.7.7"
     },
     "autoload": {
         "psr-4": {