diff --git a/packages/sui-polyfills/CHANGELOG.md b/packages/sui-polyfills/CHANGELOG.md
index f868934ec..5ac268763 100644
--- a/packages/sui-polyfills/CHANGELOG.md
+++ b/packages/sui-polyfills/CHANGELOG.md
@@ -1,5 +1,14 @@
 # CHANGELOG
 
+# 1.21.0 (2023-12-19)
+
+
+### Features
+
+* **packages/sui-polyfills:** add polyfill for string is|to wellFormed ([705404e](https://github.com/SUI-Components/sui/commit/705404ea5332157227ecfb924562d525e5956d80))
+
+
+
 # 1.20.0 (2023-11-29)
 
 
diff --git a/packages/sui-polyfills/package.json b/packages/sui-polyfills/package.json
index 3d65fa669..cf6bc7bb1 100644
--- a/packages/sui-polyfills/package.json
+++ b/packages/sui-polyfills/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@s-ui/polyfills",
-  "version": "1.20.0",
+  "version": "1.21.0",
   "description": "Common polyfills for your project",
   "main": "src/index.js",
   "scripts": {},