diff --git a/composer.json b/composer.json
index aaae5df..8491e6b 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
     "php": ">=5.3"
   },
   "require-dev": {
-    "phpunit/phpunit": "~4.8",
+    "phpunit/phpunit": ">=4.8.26",
     "codeclimate/php-test-reporter": "dev-master"
   }
 }