diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6dd55596..0bb83950 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,19 @@
+## [13.0.0](https://github.com/multiformats/js-multiformats/compare/v12.1.3...v13.0.0) (2023-12-20)
+
+
+### ⚠ BREAKING CHANGES
+
+* this module is now TypeScript - the API has not changed but releasing as a major for saftey
+
+### Features
+
+* convert codebase to typescript ([#251](https://github.com/multiformats/js-multiformats/issues/251)) ([fcee86e](https://github.com/multiformats/js-multiformats/commit/fcee86e80f4a2b738973bf6a9c923f797cf7df16)), closes [#249](https://github.com/multiformats/js-multiformats/issues/249)
+
+
+### Trivial Changes
+
+* **deps:** bump actions/setup-node from 3.8.2 to 4.0.0 ([139b3c2](https://github.com/multiformats/js-multiformats/commit/139b3c2fa0d1afcba9f0aafde929fcf69f4d7804))
+
 ## [12.1.3](https://github.com/multiformats/js-multiformats/compare/v12.1.2...v12.1.3) (2023-10-25)
 
 
diff --git a/package.json b/package.json
index 8e9e2df3..c0697523 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "multiformats",
-  "version": "12.1.3",
+  "version": "13.0.0",
   "description": "Interface for multihash, multicodec, multibase and CID",
   "author": "Mikeal Rogers <mikeal.rogers@gmail.com> (https://www.mikealrogers.com/)",
   "license": "Apache-2.0 OR MIT",