diff --git a/composer.json b/composer.json
index 9bbccb8..1ecd938 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,7 @@
         "guzzlehttp/guzzle": "~5.2"
     },
     "require-dev": {
-        "phpunit/phpunit": "4.0.*"
+        "phpunit/phpunit": "4.6.*"
     },
     "autoload": {
         "psr-4": { "Choccybiccy\\": "src/" }