diff --git a/package.json b/package.json
index 4a6393f..8db6834 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,7 @@
     "check-more-types": "2.20.2",
     "ecstatic": "1.4.0",
     "http-proxy": "1.8.1",
-    "istanbul": "0.3.5",
+    "istanbul": "0.4.3",
     "lazy-ass": "1.4.0",
     "optimist": "0.6.1",
     "quote": "0.2.2",