diff --git a/CHANGELOG.md b/CHANGELOG.md
index f7fe3b6..afd8f88 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,9 +5,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/) and this
 project adheres to [Semantic Versioning](http://semver.org/).
 
-## Unreleased
+<!-- ## Unreleased -->
 
-- `--horizons` flag and `horizon` config setting has been replaced with the
+## [0.5.10] 2021-09-27
+
+- The `--horizons` flag and `horizon` config setting has been replaced with
   `--auto-sample-conditions` and `autoSampleConditions`. `--horizon` will
   continue to work for backwards compatibility, but please do update to the new
   name.
diff --git a/package-lock.json b/package-lock.json
index 97ea139..b25ff61 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "tachometer",
-  "version": "0.5.9",
+  "version": "0.5.10",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "tachometer",
-      "version": "0.5.9",
+      "version": "0.5.10",
       "license": "BSD-3-Clause",
       "dependencies": {
         "@types/command-line-usage": "^5.0.1",
diff --git a/package.json b/package.json
index f3fe11b..2f9437b 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "tachometer",
-  "version": "0.5.9",
+  "version": "0.5.10",
   "description": "Web benchmark runner",
   "main": "lib/cli.js",
   "directories": {