diff --git a/package.json b/package.json
index 9811202..06a4aff 100644
--- a/package.json
+++ b/package.json
@@ -39,7 +39,7 @@
     "aguid": "^1.0.3",
     "hapi": "^11.0.0",
     "codeclimate-test-reporter": "^0.1.1",
-    "istanbul": "^0.3.22",
+    "istanbul": "^0.4.0",
     "jshint": "^2.8.0",
     "pre-commit": "^1.1.1",
     "tap-spec": "^4.1.0",