diff --git a/bake.rb b/bake.rb
index abdb0ea..c45b1f4 100644
--- a/bake.rb
+++ b/bake.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 # Released under the MIT License.
-# Copyright, 2025-2026, by Samuel Williams.
+# Copyright, 2026, by Samuel Williams.
 
 # Update copyrights and project documentation for the new version.
 #
diff --git a/lib/protocol/websocket/version.rb b/lib/protocol/websocket/version.rb
index 3ece2af..7591549 100644
--- a/lib/protocol/websocket/version.rb
+++ b/lib/protocol/websocket/version.rb
@@ -7,6 +7,6 @@
 module Protocol
 	# @namespace
 	module WebSocket
-		VERSION = "0.21.2"
+		VERSION = "0.21.3"
 	end
 end
diff --git a/readme.md b/readme.md
index d1757d2..64150e5 100644
--- a/readme.md
+++ b/readme.md
@@ -16,7 +16,7 @@ Please see the [project documentation](https://socketry.github.io/protocol-webso
 
 Please see the [project releases](https://socketry.github.io/protocol-websocket/releases/index) for all releases.
 
-### Unreleased
+### v0.21.3
 
   - Adopt reviewed GitHub release pull requests, RubyGems Trusted Publishing, and release attestations instead of legacy certificate signing.
 
diff --git a/releases.md b/releases.md
index d381ca1..5793cf8 100644
--- a/releases.md
+++ b/releases.md
@@ -1,6 +1,6 @@
 # Releases
 
-## Unreleased
+## v0.21.3
 
   - Adopt reviewed GitHub release pull requests, RubyGems Trusted Publishing, and release attestations instead of legacy certificate signing.