bump version number
diff --git a/lib/ts/package-lock.json b/lib/ts/package-lock.json
index f99d8a3..31e0c52 100644
--- a/lib/ts/package-lock.json
+++ b/lib/ts/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "thrift",
-  "version": "0.20.0",
+  "version": "0.21.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {