CHANGELOG.md in request_handler-2.1.0 vs CHANGELOG.md in request_handler-2.1.1

@@ -2,9 +2,15 @@
 All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+## [2.1.1] - 2021-06-14
+### Fixed
+- Change error object's source attribute from `param` to `parameters` to align with JSONAPI specification
+
 ## [2.1.0] - 2020-04-01
 ### Added
 - Headers validation
 
 ## [2.0.0] - 2019-11-19