diff --git a/CHANGELOG.md b/CHANGELOG.md
index b8dda08..3e51284 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 ## [Unreleased]
 
+## [0.2.1] - 2024-05-16
+
+### Fixed
+
+- Use `frozen_string_literal`.
+
 ## [0.2.0] - 2023-05-05
 
 ### Added
diff --git a/lib/progeny/version.rb b/lib/progeny/version.rb
index e699528..abc3a62 100644
--- a/lib/progeny/version.rb
+++ b/lib/progeny/version.rb
@@ -1,3 +1,3 @@
 module Progeny
-  VERSION = '0.2.0'
+  VERSION = '0.2.1'
 end