diff --git a/package.json b/package.json
index 33c86c0..a6a1dfe 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,7 @@
   "author": "Erik Vullings <erik.vulllings@gmail.com>",
   "license": "MIT",
   "dependencies": {
-    "async": "^1.5.2",
+    "async": "^3.2.2",
     "carto": "^0.15.3",
     "express": "^4.13.3",
     "mapnik": "^3.5.2",