diff --git a/CHANGELOG.md b/CHANGELOG.md
index 56ddeef3..9523bbb2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,18 @@
 # es-toolkit Changelog
 
+## Version v1.21.0
+
+Released on September 25th, 2024.
+
+- Added support for [constantCase](https://es-toolkit.slash.page/reference/string/constantCase.html) and [isError](https://es-toolkit.slash.page/reference/predicate/isError.html).
+- Added compatibility functions for [pad](https://es-toolkit.slash.page/reference/compat/string/pad.html), [padStart](https://es-toolkit.slash.page/reference/compat/string/padStart.html), [padEnd](https://es-toolkit.slash.page/reference/compat/string/padEnd.html), [defer](https://es-toolkit.slash.page/reference/compat/function/defer.html), [isFinite](https://es-toolkit.slash.page/reference/compat/predicate/isFinite.html), [toNumber](https://es-toolkit.slash.page/reference/compat/math/toNumber.html), [toFinite](https://es-toolkit.slash.page/reference/compat/math/toFinite.html), and [toInteger](https://es-toolkit.slash.page/reference/compat/math/toInteger.html).
+- Improved performance for [flatten](https://es-toolkit.slash.page/reference/array/flatten.html), [isNumber](https://es-toolkit.slash.page/reference/predicate/isNumber.html), [isString](https://es-toolkit.slash.page/reference/predicate/isString.html), [isSymbol](https://es-toolkit.slash.page/reference/predicate/isSymbol.html), [isRegExp](https://es-toolkit.slash.page/reference/predicate/isRegExp.html), and [isBoolean](https://es-toolkit.slash.page/reference/predicate/isBoolean.html).
+- Fixed [compact](https://es-toolkit.slash.page/reference/array/compact.html) to correctly exclude `0n` as a falsey value.
+- Fixed [pick](https://es-toolkit.slash.page/reference/object/pick.html) to not pick nonexistent keys from the original object.
+- Fixed [omit](https://es-toolkit.slash.page/reference/object/omit.html) to accept readonly arrays.
+
+This version includes contributions from @hyesungoh, @D-Sketon, @mass2527, @gweesin, @VVSOGI, @coding-honey, @seonghun0828, and @jsparkdev. Thank you for your valuable contributions!
+
 ## Version v1.20.0
 
 Released on September 20th, 2024.
diff --git a/jsr.json b/jsr.json
index d186e411..3476a7ff 100644
--- a/jsr.json
+++ b/jsr.json
@@ -1,6 +1,6 @@
 {
   "name": "@es-toolkit/es-toolkit",
-  "version": "1.20.0",
+  "version": "1.21.0",
   "exports": {
     ".": "./src/index.ts",
     "./compat": "./src/compat/index.ts"
diff --git a/package.json b/package.json
index a3e3ab36..03da2eb2 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "es-toolkit",
   "description": "A state-of-the-art, high-performance JavaScript utility library with a small bundle size and strong type annotations.",
-  "version": "1.20.0",
+  "version": "1.21.0",
   "homepage": "https://es-toolkit.slash.page",
   "bugs": "https://github.com/toss/es-toolkit/issues",
   "repository": {