diff --git a/package.json b/package.json
index 15a096c..1cc755d 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
   "repository": "math-utils/bind-integer",
   "dependencies": {},
   "devDependencies": {
-    "istanbul": "0"
+    "istanbul": "0.4.2"
   },
   "scripts": {
     "test": "node test",