diff --git a/CHANGELOG.md b/CHANGELOG.md
index 912bb57..f6cfc21 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.2.1] - 2021-12-06
+
+### Fixed
+
+- Improved performance of handling events by [@nallwhy](https://github.com/nallwhy).
+
 ## [1.2.0] - 2021-09-30
 
 ### Added
diff --git a/mix.exs b/mix.exs
index 50665fe..ee7de95 100644
--- a/mix.exs
+++ b/mix.exs
@@ -4,7 +4,7 @@ defmodule TelemetryMetricsAppsignal.MixProject do
   def project do
     [
       app: :telemetry_metrics_appsignal,
-      version: "1.2.0",
+      version: "1.2.1",
       elixir: "~> 1.10",
       elixirc_paths: elixirc_paths(Mix.env()),
       source_url: "https://github.com/surgeventures/telemetry_metrics_appsignal",