diff --git a/composer.json b/composer.json
index ccd7154..660b881 100644
--- a/composer.json
+++ b/composer.json
@@ -7,7 +7,7 @@
 	"licence": "MIT",
 
 	"require-dev": {
-		"satooshi/php-coveralls": "dev-master",
+		"satooshi/php-coveralls": "^2.0",
 		"phpunit/phpunit": "^6.0"
 	},