Bump patch version.

ioquatix · ioquatix · commit ae8431120e66 · 2026-04-01T19:31:25.000+13:00
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -2,7 +2,7 @@
 
 All notable changes to this project will be documented in this file. For info on how to format all future additions to this file please reference [Keep A Changelog](https://keepachangelog.com/en/1.0.0/).
 
-## Unreleased
+## [3.1.21] - 2026-04-01
 
 ### Security
 
diff --git a/lib/rack/version.rb b/lib/rack/version.rb
@@ -12,7 +12,7 @@
 # so it should be enough just to <tt>require 'rack'</tt> in your code.
 
 module Rack
-  RELEASE = "3.1.20"
+  RELEASE = "3.1.21"
 
   # Return the Rack release as a dotted string.
   def self.release
