diff --git a/CHANGELOG.md b/CHANGELOG.md
index a5c48d2..bb32547 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,10 @@ The format is based on [Keep a Changelog 1.0.0].
 
 ## [Unreleased]
 
+## [Release 1.3.3]
+
+- Add regular expression to validate UKAIT NCNs and convert them to NCN-based URIs.
+
 ## [Release 1.3.2]
 
 - Add a new unlisted court with the UKAIT court code in order that EUI court validation works.
@@ -107,7 +111,8 @@ The format is based on [Keep a Changelog 1.0.0].
 
 - Initial tagged release
 
-[unreleased]: https://github.com/nationalarchives/ds-caselaw-utils/compare/v1.3.2...HEAD
+[unreleased]: https://github.com/nationalarchives/ds-caselaw-utils/compare/v1.3.3...HEAD
+[release 1.3.3]: https://github.com/nationalarchives/ds-caselaw-utils/compare/v1.3.2...v1.3.3
 [release 1.3.2]: https://github.com/nationalarchives/ds-caselaw-utils/compare/v1.3.1...v1.3.2
 [release 1.3.1]: https://github.com/nationalarchives/ds-caselaw-utils/compare/v1.3.0...v1.3.1
 [release 1.3.0]: https://github.com/nationalarchives/ds-caselaw-utils/compare/v1.2.1...v1.3.0
diff --git a/pyproject.toml b/pyproject.toml
index c9a22ab..69b219a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "ds_caselaw_utils"
-version = "1.3.2"
+version = "1.3.3"
 description = "Utilities for the National Archives Caselaw project"
 authors = ["Nick Jackson <nick@dxw.com>", "David McKee <dragon@dxw.com>", "Tim Cowlishaw <tim@timcowlishaw.co.uk>", "Laura Porter <laura@dxw.com>"]
 license = "MIT"