diff --git a/package.json b/package.json
index 695308f..5bd238e 100644
--- a/package.json
+++ b/package.json
@@ -46,7 +46,7 @@
   },
   "devDependencies": {
     "coveralls": "~2.11.6",
-    "istanbul": "~0.4.2",
+    "istanbul": "~0.4.5",
     "mocha": "~2.4.1",
     "mocha-lcov-reporter": "~1.2.0"
   }