diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6ef2002..9bef9a9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,19 @@ All notable changes to this project will be documented in this file.
 The format is loosely 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).
 
+## [1.3.1] - 2023-08-18
+
+### Added
+
+- Documentation for all tokens
+- A TypeDoc presenting documentations
+
+### Changed
+
+- Updated documentation in README
+- Fixed `not` token potentially negating a numbered back-reference
+
+
 ## [1.3.0] - 2023-08-17
 
 ### Added
@@ -60,3 +73,4 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 [1.2.0]: https://github.com/hlysine/readable-regexp/releases/tag/v1.2.0
 [1.2.1]: https://github.com/hlysine/readable-regexp/releases/tag/v1.2.1
 [1.3.0]: https://github.com/hlysine/readable-regexp/releases/tag/v1.3.0
+[1.3.1]: https://github.com/hlysine/readable-regexp/releases/tag/v1.3.1
diff --git a/package.json b/package.json
index f0201a3..86429b6 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "readable-regexp",
-  "version": "1.3.0",
+  "version": "1.3.1",
   "author": "Henry Lin",
   "license": "MIT",
   "description": "Create readable Regular Expressions with concise and flexible syntax.",