Preparing for release 6.1.1

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: lizkenyon

CHANGELOG.md

@@ -6,6 +6,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## Unreleased
+
+## v6.1.1 - 2026-03-02
 - [#456](https://github.com/Shopify/shopify-api-php/pull/456) [Patch] Update firebase/php-jwt to ^7.0 to address security vulnerability (GHSA-2x45-7fc3-mxwq)
 
 ## v6.1.0 - 2026-01-21

src/version.php

@@ -1,5 +1,5 @@
 <?php
 
 // @codeCoverageIgnoreStart
-return '6.1.0';
+return '6.1.1';
 // @codeCoverageIgnoreEnd