RELEASE_NOTES.md in fontawesome-free-6.4.2.0 vs RELEASE_NOTES.md in fontawesome-free-6.4.2.1

@@ -4,9 +4,17 @@
 
 ## [Unreleased]
 
 * none
 
+## [6.4.2.1] - 2023-09-07
+
+* Updated Ruby minimum version to 3.1
+
+## [6.4.2.0] - 2023-09-07
+
+* Updated to FontAwesome 6.4.2
+
 ## [6.4.0.0] - 2023-04-08
 
 * Initial release
 * Updated to FontAwesome 6.4.0