diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2673543..b0ec738 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,11 +17,17 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 <!-- ### Removed -->
 <!-- ### Fixed -->
 
-## Unreleased
+## [2.1.0] - 2024-05-16
+
+### Added
+
+- Added `readonly` flag to `PropertyLike`, the common interface of variables, class fields, and function parameters. ([#118](https://github.com/webcomponents/custom-elements-manifest/pull/#118))
+
+- Added support for describing the [CSS Custom State](https://developer.mozilla.org/en-US/docs/Web/API/CustomStateSet) of an element. ([#128](https://github.com/webcomponents/custom-elements-manifest/pull/128))
 
 ### Fixed
 
-- Clarified that all attributes of a `CustomElement` must be listed in the the `attributes` array, even those reflected from a `CustomElementField`.
+- Clarified that all attributes of a `CustomElement` must be listed in the the `attributes` array, even those reflected from a `CustomElementField`. ([#126](https://github.com/webcomponents/custom-elements-manifest/pull/126))
 
 ## [2.0.0] - 2022-09-12
 
diff --git a/README.md b/README.md
index 9ed2175..6a7e8c5 100644
--- a/README.md
+++ b/README.md
@@ -37,9 +37,14 @@ In order to allow tools to find npm packages with custom element manifests witho
 ## Schema Versioning
 
 The schema has a `schemaVersion` field in the top-level object to facilitate
-evolution of the schema. The schema follows [semver](https://semver.org/) versioning, the current schema version is `2.0.0`.
+evolution of the schema. The schema follows [semver](https://semver.org/) versioning, the current schema version is `2.1.0`.
 
-This version will not always match the npm package version, as some changes to the npm package might not have changes to the schema. We will publish a list of schema versions and their associated npm versions and git tags.
+This version may not always match the npm package version, as some changes to the npm package might not have changes to the schema.
+
+| Schema Version | Date       | npm Version | git Tag |
+| -------------- | ---------- | ----------- | ------- |
+| 2.1.0          | 2024-05-06 | 2.1.0       | v2.2.0  |
+| 2.0.0          | 2022-09-13 | 2.0.0       | v2.0.0  |
 
 ## Example
 
@@ -75,7 +80,7 @@ The manifest would look like:
 `my-project/custom-elements.json`:
 ```json
 {
-  "schemaVersion": "2.0.0",
+  "schemaVersion": "2.1.0",
   "readme": "README.md",
   "modules": [
     {
diff --git a/examples/simple-element.json b/examples/simple-element.json
index c7500ee..fbd23e5 100644
--- a/examples/simple-element.json
+++ b/examples/simple-element.json
@@ -1,5 +1,5 @@
 {
-  "schemaVersion": "2.0.0",
+  "schemaVersion": "2.1.0",
   "readme": "README.md",
   "modules": [
     {
diff --git a/package-lock.json b/package-lock.json
index 98cf841..42b3664 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "custom-elements-manifest",
-  "version": "2.0.0",
+  "version": "2.1.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "custom-elements-manifest",
-      "version": "2.0.0",
+      "version": "2.1.0",
       "license": "BSD-3-Clause",
       "devDependencies": {
         "jsonschema": "^1.4.0",
diff --git a/package.json b/package.json
index 8d867a6..54c9542 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "custom-elements-manifest",
-  "version": "2.0.0",
+  "version": "2.1.0",
   "description": "A file format for describing custom elements",
   "type": "module",
   "main": "schema.json",