diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0d72887..912bb57 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,25 +1,42 @@
 # Changelog
+
 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).
 
+## [1.2.0] - 2021-09-30
+
+### Added
+
+- Added support for telemetry 1.0.
+
 ## [1.1.0] - 2021-01-21
-### Changed
+
+### Added
+
 - Added support for Appsignal 2.0.
+
 ## [1.0.0] - 2020-05-27
+
 ### Changed
+
 - `TelemetryMetricsAppsignal` is now implemented as a `GenServer` and performs cleanup
-of telemetry handlers upon termination (kudos to @bradleygolden).
+  of telemetry handlers upon termination (kudos to @bradleygolden).
 
 ### Fixed
+
 - Marked `jason` as an optional dependency - it's only required by `appsignal` when testing.
 - Suppressed warning when measurement was missing from an event.
 
 ## [0.1.1] - 2020-05-17
+
 ### Fixed
+
 - Fixed using `tag_values` to generate tags from metadata.
 
 ## [0.1.0] - 2020-04-07
+
 ### Added
+
 - Implemented reporting all `Telemetry.Metrics` measurements to AppSignal.
diff --git a/mix.exs b/mix.exs
index 552ca75..50665fe 100644
--- a/mix.exs
+++ b/mix.exs
@@ -4,7 +4,7 @@ defmodule TelemetryMetricsAppsignal.MixProject do
   def project do
     [
       app: :telemetry_metrics_appsignal,
-      version: "1.1.0",
+      version: "1.2.0",
       elixir: "~> 1.10",
       elixirc_paths: elixirc_paths(Mix.env()),
       source_url: "https://github.com/surgeventures/telemetry_metrics_appsignal",