diff --git a/package.json b/package.json
index 9935c38..e0580d6 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,7 @@
   "devDependencies": {
     "ava": "^0.25.0",
     "babel-core": "^6.24.0",
-    "babel-plugin-istanbul": "^4.0.0",
+    "babel-plugin-istanbul": "^5.1.1",
     "babel-polyfill": "^6.23.0",
     "babel-preset-es2015": "^6.16.0",
     "babel-preset-stage-0": "^6.16.0",