diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8ccfcbd..7bd1e6f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+## v4.2.0
+
+### New Features
+
+- Add support for a custom lex function.
+
 ## v4.1.0
 
 ### New Features