diff --git a/package.json b/package.json
index 65da5f6..da23235 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "queue",
-  "version": "4.2.0",
+  "version": "4.2.1",
   "description": "asynchronous function queue with adjustable concurrency",
   "keywords": [
     "queue",