diff --git a/CHANGELOG.md b/CHANGELOG.md
index ad4a69ae..78ec4159 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,7 +11,7 @@ may change this output. Patch version increments will only do so in ways that ar
 strict improvements (e.g. from empty strings or exceptions to something more
 reasonable).
 
-## [Unreleased]
+## [0.4.0] - 2020-12-23
 
 ### Added
 
diff --git a/package-lock.json b/package-lock.json
index 0ffd7fee..200d29c9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "@mozilla/readability",
-  "version": "0.3.0",
+  "version": "0.4.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 2d4e614d..dc4a8059 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@mozilla/readability",
-  "version": "0.3.0",
+  "version": "0.4.0",
   "description": "A standalone version of the readability library used for Firefox Reader View.",
   "main": "index.js",
   "scripts": {