diff --git a/package.json b/package.json
index a45b0b4..20189d2 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,7 @@
   "author": "Julian Kern",
   "license": "MIT",
   "dependencies": {
-    "es6-promisify": "^5.0.0",
+    "es6-promisify": "^6.0.2",
     "lodash.template": "^4.4.0",
     "sw-precache": "^5.2.0",
     "uglify-js": "^3.0.28",