diff --git a/package.json b/package.json
index d28e200..37c3b0a 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,7 @@
   },
   "devDependencies": {
     "after": "0.8.1",
-    "istanbul": "0.4.1",
+    "istanbul": "0.4.2",
     "mocha": "2.3.4",
     "supertest": "1.1.0"
   },