diff --git a/package.json b/package.json
index cdce050..2a40913 100644
--- a/package.json
+++ b/package.json
@@ -46,7 +46,7 @@
     "babel-eslint": "^6.1.2",
     "babel-plugin-add-module-exports": "^0.2.1",
     "babel-preset-es2015": "^6.1.18",
-    "coveralls": "*",
+    "coveralls": "2.11.15",
     "eslint": "^3.3.0",
     "isparta": "*",
     "remark": "^6.0.1",