diff --git a/composer.json b/composer.json
index f1479fc..d33ab0a 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
     },
     "require-dev": {
         "phpunit/phpunit": "*",
-        "satooshi/php-coveralls": "dev-master"
+        "satooshi/php-coveralls": "~1.0"
     },
     "autoload": {
         "psr-4": {