diff --git a/package.json b/package.json
index 66778b5af5..8e673837c3 100644
--- a/package.json
+++ b/package.json
@@ -57,7 +57,7 @@
     "eslint-config-openlayers": "5.0.0",
     "expect.js": "0.3.1",
     "gaze": "^1.0.0",
-    "istanbul": "0.4.3",
+    "istanbul": "0.4.4",
     "jquery": "2.2.4",
     "mocha": "2.5.3",
     "mocha-phantomjs-core": "^1.3.0",