diff --git a/CHANGELOG.md b/CHANGELOG.md
index 628b9f8b..486073ac 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,7 +5,9 @@ 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 -->
+
+## [0.5.5] 2020-09-21
 
 - A warning is now displayed when there are multiple performance marks or
   measurements being retrieved with the same name.
diff --git a/package-lock.json b/package-lock.json
index 3372ef3e..7db15891 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "tachometer",
-  "version": "0.5.4",
+  "version": "0.5.5",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index f682ddc8..9d336107 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "tachometer",
-  "version": "0.5.4",
+  "version": "0.5.5",
   "description": "Web benchmark runner",
   "main": "lib/cli.js",
   "directories": {