diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 00000000..bdee86d5
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,41 @@
+# 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/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [5.2.0] - 2024-02-05
+
+### Added
+
+- Add `Connection#finished_request?`
+  ([#743](https://github.com/httprb/http/pull/743))
+- Add `Instrumentation#on_error`
+  ([#746](https://github.com/httprb/http/pull/746))
+- Add `base64` dependency (suppresses warnings on Ruby 3.0)
+  ([#759](https://github.com/httprb/http/pull/759))
+- Add `PURGE` HTTP verb
+  ([#757](https://github.com/httprb/http/pull/757))
+- Add Ruby-3.3 support
+
+### Changed
+
+- **BREAKING** Process features in reverse order
+  ([#766](https://github.com/httprb/http/pull/766))
+- **BREAKING** Downcase Content-Type charset name
+  ([#753](https://github.com/httprb/http/pull/753))
+- **BREAKING** Make URI normalization more conservative
+  ([#758](https://github.com/httprb/http/pull/758))
+
+### Fixed
+
+- Close sockets on initialize failure
+  ([#762](https://github.com/httprb/http/pull/762))
+- Prevent CRLF injection due to broken URL normalizer
+  ([#765](https://github.com/httprb/http/pull/765))
+
+[unreleased]: https://github.com/httprb/http/compare/v5.2.0...5-x-stable
+[5.2.0]: https://github.com/httprb/http/compare/v5.1.1...v5.2.0
diff --git a/CHANGES.md b/CHANGES_OLD.md
similarity index 100%
rename from CHANGES.md
rename to CHANGES_OLD.md
diff --git a/lib/http/version.rb b/lib/http/version.rb
index 37dbd144..1c348cfe 100644
--- a/lib/http/version.rb
+++ b/lib/http/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module HTTP
-  VERSION = "5.1.1"
+  VERSION = "5.2.0"
 end