diff --git a/package.json b/package.json
index 9bcea3a..3135a41 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
     "ee-first": "1.1.1"
   },
   "devDependencies": {
-    "istanbul": "0.4.2",
+    "istanbul": "0.4.5",
     "mocha": "2.4.5"
   },
   "engines": {