diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index 327d46d6ac97a9..809c1b439076e0 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -1,5 +1,71 @@
# Release notes
+## [v3.3.4](https://github.com/mdn/browser-compat-data/releases/tag/v3.3.4)
+
+May 20, 2021
+
+### Notable changes
+
+- The [definition of the `experimental` status](https://github.com/mdn/browser-compat-data/blob/main/schemas/compat-data-schema.md#status-information) has been revised to more closely reflect its actual use. For more information on choosing values for `experimental`, see the [the new data guideline for `experimental`](https://github.com/mdn/browser-compat-data/blob/main/docs/data-guidelines.md#choosing-an-experimental-status). ([#9933](https://github.com/mdn/browser-compat-data/pull/9933))
+
+- The schema now permits valid WebGL specification links. ([#10353](https://github.com/mdn/browser-compat-data/pull/10353))
+
+- `api.Navigator.geolocation.hid` has been moved to the correctly nested `api.Navigator.hid`. ([#10291](https://github.com/mdn/browser-compat-data/pull/10291))
+
+- `http.headers.feature-policy.wake-lock` has been moved to the correctly-named `http.headers.feature-policy.screen-wake-lock`. ([#10421](https://github.com/mdn/browser-compat-data/pull/10421))
+
+- The following mixin features have been migrated to their exposed interfaces:
+
+ | Before | After |
+ | ------------------------------- | ---------------------------------------------------------------------------------------------- |
+ | `api.ChildNode` | (removed) |
+ | `api.ChildNode.before` | `api.CharacterData.before`
`api.DocumentType.before`
`api.Element.before` |
+ | `api.ChildNode.remove` | `api.CharacterData.remove`
`api.DocumentType.remove`
`api.Element.remove` |
+ | `api.ChildNode.replaceWith` | `api.CharacterData.replaceWith`
`api.DocumentType.replaceWith`
`api.Element.replaceWith` |
+ | `api.URLUtilsReadOnly` | (removed) |
+ | `api.URLUtilsReadOnly.hash` | `api.WorkerLocation.hash` |
+ | `api.URLUtilsReadOnly.host` | `api.WorkerLocation.host` |
+ | `api.URLUtilsReadOnly.hostname` | `api.WorkerLocation.hostname` |
+ | `api.URLUtilsReadOnly.href` | `api.WorkerLocation.href` |
+ | `api.URLUtilsReadOnly.origin` | `api.WorkerLocation.origin` |
+ | `api.URLUtilsReadOnly.pathname` | `api.WorkerLocation.pathname` |
+ | `api.URLUtilsReadOnly.port` | `api.WorkerLocation.port` |
+ | `api.URLUtilsReadOnly.protocol` | `api.WorkerLocation.protocol` |
+ | `api.URLUtilsReadOnly.search` | `api.WorkerLocation.search` |
+ | `api.URLUtilsReadOnly.toString` | `api.WorkerLocation.toString` |
+
+ For details, see [#10347](https://github.com/mdn/browser-compat-data/pull/10347) and [#10506](https://github.com/mdn/browser-compat-data/pull/10506).
+
+- The following non-existent, long-removed, or otherwise irrelevant features have been removed:
+
+ - `api.BudgetService` ([#10417](https://github.com/mdn/browser-compat-data/pull/10417))
+ - `api.SVGColorProfileElement` ([#10515](https://github.com/mdn/browser-compat-data/pull/10515))
+ - `api.SVGExternalResourcesRequired` ([#10539](https://github.com/mdn/browser-compat-data/pull/10539))
+ - `api.SVGSolidcolorElement` ([#10515](https://github.com/mdn/browser-compat-data/pull/10515))
+ - `api.SVGStylable` ([#10536](https://github.com/mdn/browser-compat-data/pull/10536))
+ - `api.SVGTransformable` [#10354](https://github.com/mdn/browser-compat-data/pull/10354)
+ - `api.SVGURIReference` ([#10522](https://github.com/mdn/browser-compat-data/pull/10522))
+ - `api.TransitionEvent.animationName` ([#10336](https://github.com/mdn/browser-compat-data/pull/10336))
+ - `api.Window.returnValue` ([#10449](https://github.com/mdn/browser-compat-data/pull/10449))
+ - `api.WindowClient.ancestorOrigins` ([#10415](https://github.com/mdn/browser-compat-data/pull/10415))
+ - `css.at-rules.media.prefers-reduced-transparency` ([#6944](https://github.com/mdn/browser-compat-data/pull/6944))
+ - `css.at-rules.media.scan` ([#6944](https://github.com/mdn/browser-compat-data/pull/6944))
+ - `css.at-rules.media.update` ([#6944](https://github.com/mdn/browser-compat-data/pull/6944))
+ - `css.at-rules.page.bleed` ([#6944](https://github.com/mdn/browser-compat-data/pull/6944))
+ - `css.at-rules.page.marks` ([#6944](https://github.com/mdn/browser-compat-data/pull/6944))
+ - `css.at-rules.page.page-margin-boxes` ([#6944](https://github.com/mdn/browser-compat-data/pull/6944))
+ - `html.elements.multicol` ([#10545](https://github.com/mdn/browser-compat-data/pull/10545))
+ - `svg.attributes.conditional_processing.externalResourcesRequired` ([#10539](https://github.com/mdn/browser-compat-data/pull/10539))
+ - `svg.elements.color-profile` ([#10515](https://github.com/mdn/browser-compat-data/pull/10515))
+ - `svg.elements.solidcolor` ([#10515](https://github.com/mdn/browser-compat-data/pull/10515))
+
+### Statistics
+
+- 18 contributors have changed 361 files with 3,670 additions and 3,690 deletions in 143 commits ([`v3.3.3...v3.3.4`](https://github.com/mdn/browser-compat-data/compare/v3.3.3...v3.3.4))
+- 13,002 total features
+- 777 total contributors
+- 3,369 total stargazers
+
## [v3.3.3](https://github.com/mdn/browser-compat-data/releases/tag/v3.3.3)
May 6, 2021
diff --git a/package-lock.json b/package-lock.json
index 5d365b68a0fbc0..b629286483857e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
{
"name": "@mdn/browser-compat-data",
- "version": "3.3.3",
+ "version": "3.3.4",
"lockfileVersion": 1,
"requires": true,
"dependencies": {
diff --git a/package.json b/package.json
index b8602d8596c18e..d9b9eeba8190d7 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
{
"name": "@mdn/browser-compat-data",
- "version": "3.3.3",
+ "version": "3.3.4",
"description": "Browser compatibility data provided by MDN Web Docs",
"main": "index.js",
"types": "index.d.ts",