diff --git a/package.json b/package.json
index 118d2bb..7810a20 100644
--- a/package.json
+++ b/package.json
@@ -53,7 +53,7 @@
     "upath": "^1.0.0"
   },
   "devDependencies": {
-    "babel-plugin-istanbul": "^4.1.5",
+    "babel-plugin-istanbul": "^5.1.4",
     "cross-env": "^5.0.1",
     "esdoc": "^1.0.3",
     "esdoc-ecmascript-proposal-plugin": "^1.0.0",