diff --git a/package.json b/package.json
index 04b9925..8812bba 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,7 @@
   },
   "devDependencies": {
     "get-random-port": "0.0.1",
-    "istanbul": "0.4.2",
+    "istanbul": "0.4.4",
     "node-inspector": "0.12.5",
     "tape": "4.4.0"
   }