diff --git a/package.json b/package.json
index 1a7979e..e97663d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-in-viewport",
-  "version": "1.0.0-alpha.20",
+  "version": "1.0.0-alpha.21",
   "description": "Track React component in viewport using Intersection Observer API",
   "author": "Roderick Hsiao <roderickhsiao@gmail.com>",
   "license": "MIT",