diff --git a/HISTORY.md b/HISTORY.md
index 2e9dc8f3b3..d3a878eae3 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,7 +1,7 @@
 # History
 
 
-# unpublished changes since 12.2.0
+# 2023-12-20, 12.2.1
 
 - Fix #3109: method `Node.toHTML` not accepting a custom `handler`.
 
diff --git a/package-lock.json b/package-lock.json
index b8148eadaf..0afd024024 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "mathjs",
-  "version": "12.2.0",
+  "version": "12.2.1",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "mathjs",
-      "version": "12.2.0",
+      "version": "12.2.1",
       "license": "Apache-2.0",
       "dependencies": {
         "@babel/runtime": "^7.23.6",
diff --git a/package.json b/package.json
index 8edf9184a9..2b6b78e887 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "mathjs",
-  "version": "12.2.0",
+  "version": "12.2.1",
   "description": "Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser with support for symbolic computation, comes with a large set of built-in functions and constants, and offers an integrated solution to work with different data types like numbers, big numbers, complex numbers, fractions, units, and matrices.",
   "author": "Jos de Jong <wjosdejong@gmail.com> (https://github.com/josdejong)",
   "homepage": "https://mathjs.org",