diff --git a/package.json b/package.json
index d517c01..cdc0939 100644
--- a/package.json
+++ b/package.json
@@ -85,7 +85,7 @@
     "babel-core": "6.22.1",
     "babel-loader": "6.2.10",
     "babel-plugin-external-helpers": "6.22.0",
-    "babel-plugin-istanbul": "3.1.2",
+    "babel-plugin-istanbul": "4.1.1",
     "babel-plugin-transform-es2015-modules-umd": "6.22.0",
     "babel-polyfill": "6.22.0",
     "babel-preset-es2015": "6.22.0",