diff --git a/composer.json b/composer.json
index bfc1c85..74c418a 100644
--- a/composer.json
+++ b/composer.json
@@ -14,8 +14,8 @@
     "giggsey/libphonenumber-for-php": "7.*"
   },
   "require-dev": {
-    "phpunit/phpunit": "*",
-    "satooshi/php-coveralls": "dev-master"
+    "phpunit/phpunit": "5.*",
+    "satooshi/php-coveralls": "1.*"
   },
   "autoload": {
     "psr-4": {