bump version number
diff --git a/lib/js/package.json b/lib/js/package.json
index 8543b25..d9ab5a6 100644
--- a/lib/js/package.json
+++ b/lib/js/package.json
@@ -1,6 +1,6 @@
 {
   "name": "thrift",
-  "version": "0.20.0",
+  "version": "0.21.0",
   "description": "Thrift is a software framework for scalable cross-language services development.",
   "main": "./src/thrift",
   "author": {