diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..47228ca
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,28 @@
+# Changelog
+
+All notable changes to this project are 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).
+
+## 1.4.0
+
+### Added
+- Support for Python 3.10 through 3.14.
+- A `py.typed` marker so type checkers use the bundled inline type hints (#77).
+- A wheel is now published alongside the source distribution.
+
+### Changed
+- Minimum supported Python is now 3.10.
+- Type hints modernised to use PEP 604 unions (`X | None`) and built-in generics.
+- `clone()` preserves attributes set in subclass constructors (#73).
+- `@endpoint` includes inherited attributes and ignores methods and functions (#68).
+
+### Removed
+- Support for Python 3.6, 3.7, 3.8 and 3.9.
+- The `OptionalDict`, `OptionalStr`, `OptionalInt` and `OptionalJsonType` aliases from `apiclient.utils.typing` (use `X | None` directly).
+
+### Fixed
+- Unrelated exceptions are no longer masked as `UnexpectedError`; only request errors are wrapped (#80).
+- `post()`, `put()` and `patch()` type hints accept JSON arrays, not just objects (#90).
+- `paginators` imports `APIClient` from `apiclient.client` instead of the package root (#78).
diff --git a/VERSION b/VERSION
index 3a3cd8c..88c5fb8 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.3.1
+1.4.0