diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0d790da..19fc2be 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [1.6.4] - 2026-06-18
+### Fixed
+- Corrected copyleft documentation in `README.md`: copyleft is determined by `scanoss.py` (`scanoss-py inspect copyleft`) using the OSADL checklist, including `-or-later` licenses, rather than the internal `license.utils.ts` list
+### Removed
+- Removed the unused default copyleft license list and its include/exclude/explicit parsing from `license.utils.ts` (dead code)
+
 ## [1.6.3] - 2026-05-19
 ### Changed
 - Upgraded Node.js to 24
diff --git a/dist/index.js b/dist/index.js
index 67fdd49..19c688d 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -1,4 +1,4 @@
-/*! scanoss-code-scan-action v1.6.3 | MIT */
+/*! scanoss-code-scan-action v1.6.4 | MIT */
 "use strict";
 var __create = Object.create;
 var __defProp = Object.defineProperty;
diff --git a/package.json b/package.json
index 7ee2a80..4adac31 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "scanoss-code-scan-action",
   "description": "SCANOSS Code Scan Action",
-  "version": "1.6.3",
+  "version": "1.6.4",
   "author": "SCANOSS",
   "private": true,
   "homepage": "https://github.com/scanoss/code-scan-action/",