diff --git a/CHANGELOG.md b/CHANGELOG.md
index bce80d3..5625c7e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [6.2.1]
+
+### Fixed
+
+- Export `OptionalDataWithOptionalCause` type ([#135](https://github.com/MetaMask/rpc-errors/pull/135))
+
 ## [6.2.0]
 
 ### Added
@@ -176,7 +182,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `serializeError`
   - If the object passed to the function has a `.message` property, it will preferred over the `.message` property of the fallback error when creating the returned serialized error object
 
-[Unreleased]: https://github.com/MetaMask/rpc-errors/compare/v6.2.0...HEAD
+[Unreleased]: https://github.com/MetaMask/rpc-errors/compare/v6.2.1...HEAD
+[6.2.1]: https://github.com/MetaMask/rpc-errors/compare/v6.2.0...v6.2.1
 [6.2.0]: https://github.com/MetaMask/rpc-errors/compare/v6.1.0...v6.2.0
 [6.1.0]: https://github.com/MetaMask/rpc-errors/compare/v6.0.0...v6.1.0
 [6.0.0]: https://github.com/MetaMask/rpc-errors/compare/v5.1.1...v6.0.0
diff --git a/package.json b/package.json
index db4941a..5af061d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@metamask/rpc-errors",
-  "version": "6.2.0",
+  "version": "6.2.1",
   "description": "Ethereum RPC and Provider errors",
   "keywords": [
     "rpc",