diff --git a/CHANGELOG.md b/CHANGELOG.md
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+++ b/CHANGELOG.md
@@ -1,8 +1,26 @@
 # @tastytrade/api
-## 3.2.0
-### Minor Changes
-- Remove https.Agent in `tastytrade-http-client` [#24](https://github.com/tastytrade/tastytrade-api-js/pull/24)
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [4.0.0] - 2024-03-12
+
+### Changed
+
+- Tsconfig library updates [#35](https://github.com/tastytrade/tastytrade-api-js/pull/35)
+- target modern JS modules [#30](https://github.com/tastytrade/tastytrade-api-js/pull/30)
 - Deprecate MarketDataStreamer [#29](https://github.com/tastytrade/tastytrade-api-js/pull/29)
+- Target moden node runtimes [#22](https://github.com/tastytrade/tastytrade-api-js/pull/22)
+
+### Fixed
+
+- add missing return in getDefaultHeaders [#32](https://github.com/tastytrade/tastytrade-api-js/pull/32)
 - Dont set User-Agent header in browser environment [#28](https://github.com/tastytrade/tastytrade-api-js/pull/28)
-- Remove un-needed types dependency [#21](https://github.com/tastytrade/tastytrade-api-js/pull/21)
-- Target moden node runtimes [#22](https://github.com/tastytrade/tastytrade-api-js/pull/22)
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+
+### Removed
+
+- Remove https.Agent in `tastytrade-http-client` [#24](https://github.com/tastytrade/tastytrade-api-js/pull/24)
+- Remove un-needed types dependency [#21](https://github.com/tastytrade/tastytrade-api-js/pull/21)
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