diff --git a/CHANGES.md b/CHANGES.md
index 1fb4bc50..75858e6b 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,15 @@
 # Changelog
 
+## 4.2.1
+
+Added:
+* Add support for `/deep/` selectors (Hannah Okwelum) [T352862](https://phabricator.wikimedia.org/T352862)
+
+Fixed:
+* Fix ParseError in some division expressions (Hannah Okwelum) [T358256](https://phabricator.wikimedia.org/T358256)
+* Fix `when()` matching between string and non-string (Timo Tijhof) [T358159](https://phabricator.wikimedia.org/T358159)
+* Preserve whitespace before `;` or `!` in simple rules (Hannah Okwelum) [T352911](https://phabricator.wikimedia.org/T352911)
+
 ## 4.2.0
 
 Added:
diff --git a/lib/Less/Version.php b/lib/Less/Version.php
index 6b92f29b..fbef9787 100644
--- a/lib/Less/Version.php
+++ b/lib/Less/Version.php
@@ -6,11 +6,11 @@
 class Less_Version {
 
 	/* Current release version of less.php */
-	public const version = '4.2.0';
+	public const version = '4.2.1';
 
 	/* Upstream less.js version that this release should be compatible with */
 	public const less_version = '2.5.3';
 
 	/* Parser cache version */
-	public const cache_version = '253-1';
+	public const cache_version = '253-2';
 }