diff --git a/CHANGELOG.md b/CHANGELOG.md
index d2573d2..60eb462 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,17 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Set theme in `document.body` or `document.documentElement` by default
 
+## [1.0.0](https://github.com/metonym/svelte-dark-mode/releases/tag/v1.0.0) - 2021-03-07
+
+**Breaking Changes**
+
+- `theme` type changed to `"dark" | "light"`
+
+**Features**
+
+- validate the `theme` value at runtime (must be either "dark" or "light")
+- add event listener to automatically update the theme
+
 ## [0.3.0](https://github.com/metonym/svelte-dark-mode/releases/tag/v0.3.0) - 2020-12-22
 
 - use `SvelteComponentTyped` interface in TypeScript definitions
diff --git a/package.json b/package.json
index 46843ea..7e361ab 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "svelte-dark-mode",
-  "version": "0.3.0",
+  "version": "1.0.0",
   "license": "MIT",
   "description": "Support dark mode in your Svelte apps",
   "author": "Eric Liu (https://github.com/metonym)",