diff --git a/package.json b/package.json
index 41dd6296..b6af0c2a 100644
--- a/package.json
+++ b/package.json
@@ -42,7 +42,7 @@
   "devDependencies": {
     "cheerio": "^0.19.0",
     "coveralls": "^2.11.2",
-    "istanbul": "^0.3.15",
+    "istanbul": "^0.3.22",
     "mocha": "^2.1.0",
     "mocha-lcov-reporter": "0.0.2",
     "supertest": "^0.15.0"