diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..c75e8d7
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,47 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+[comment]: <> (Added: new features)
+[comment]: <> (Changed: changes in existing functionality)
+[comment]: <> (Deprecated: soon-to-be removed features)
+[comment]: <> (Removed: now removed features)
+[comment]: <> (Fixed: any bug fixes)
+[comment]: <> (Security: in case of vulnerabilities)
+
+## [Unreleased]
+
+## [2.0.0] - 2025-08-05
+
+### Added
+
+- Native eventing ([#145](https://github.com/casper-ecosystem/cep18/pull/145)) — Adds native events feature.
+- Legacy compatibility mode ([#154](https://github.com/casper-ecosystem/cep18/pull/154)) — Enables migration to the 2.0 network and adds test fixtures.
+
+### Changed
+
+- Disable integer sign extensions ([#139](https://github.com/casper-ecosystem/cep18/pull/139)) — Modifies the build script to omit unsupported WASM opcodes.
+- Use `DEFAULT_ACCOUNTS` in tests ([#146](https://github.com/casper-ecosystem/cep18/pull/146)) — Updates tests to rely on `DEFAULT_ACCOUNTS`.
+- Update JavaScript client for 2.0 ([#161](https://github.com/casper-ecosystem/cep18/pull/161)) — Updates the JS client for 2.0 network support and adds tests.
+
+### Deprecated
+
+_(No entries)_
+
+### Removed
+
+- Remove entry point and `condor` / `casper_2` key ([#173](https://github.com/casper-ecosystem/cep18/pull/173)) — Removes use of 2.0-specific entry point and named key.
+
+### Fixed
+
+- Native events error topic ([#150](https://github.com/casper-ecosystem/cep18/pull/150)) — Prevents `MessageTopics` from committing state changes on failed execution.
+- Prevent revert on upgrade with same events ([#160](https://github.com/casper-ecosystem/cep18/pull/160)) — Fixes upgrade failure when events have not changed.
+
+### Security
+
+- HAL fixes ([#172](https://github.com/casper-ecosystem/cep18/pull/172)) — Addresses multiple issues identified during the audit.
+
+## [1.2.0] - 2024-04-11
diff --git a/client-js/CHANGELOG.md b/client-js/CHANGELOG.md
index e0bcdc2..54eea20 100644
--- a/client-js/CHANGELOG.md
+++ b/client-js/CHANGELOG.md
@@ -3,24 +3,24 @@
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 <!--
-  Please follow below structures.
-  ## [1.1.1] - 2023-03-05
+  Please follow the structure below:
+  ## [1.1.1] - YYYY-MM-DD
   ### Added
   ### Fixed
   ### Changed
   ### Removed
- -->
+-->
 
 ## [Unreleased]
 
-## [2.0.0] - 2025-10-03
+## [2.0.0] - 2025-08-05
 
 ### Changed
 
-- Refactoring for 2.0.0 Version
+- Update JavaScript client for 2.0 ([#161](https://github.com/casper-ecosystem/cep18/pull/161)) — Updates the JS client for 2.0 network support and adds tests.
 
 ## [1.0.3] - 2023-11-02
 
 ### Fixed
 
-- fixed event listener is not working ([#109](https://github.com/casper-ecosystem/cep18/pull/109))
+- Fixed issue where the event listener was not working ([#109](https://github.com/casper-ecosystem/cep18/pull/109))