diff --git a/CHANGELOG.md b/CHANGELOG.md
index 24ca3af58..39e86bc3e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ and Yorkie JS SDK adheres to [Semantic Versioning](https://semver.org/spec/v2.0.
 ### Fixed
 
 - Prevent remote-change events in RealtimeSyncOff mode by @chacha912 in https://github.com/yorkie-team/yorkie-js-sdk/pull/824
+- Fix invalid error message in CRDTTreePos by @hackerwins in https://github.com/yorkie-team/yorkie-js-sdk/pull/830
 
 ## [0.4.20] - 2024-05-24
 
diff --git a/package.json b/package.json
index 22e1eea80..9b6a40fbf 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "yorkie-js-sdk",
-  "version": "0.4.21-rc",
+  "version": "0.4.21-rc2",
   "description": "Yorkie JS SDK",
   "main": "./dist/yorkie-js-sdk.js",
   "typings": "./dist/yorkie-js-sdk.d.ts",