diff --git a/README.md b/README.md
index 1e153a2..9f86652 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# castLabs Electron v9.0.3 for Content Security
+# castLabs Electron v9.0.4 for Content Security
 
 Check out the [Wiki](https://github.com/castlabs/electron-releases/wiki) for general news and other updates.
 
@@ -12,7 +12,7 @@ The provided builds are VMP-signed for development use, i.e. using Widevine UAT
  
 The sections below will describe the additions to the Electron APIs, for anything else refer to the regular Electron documentation:
 
-[Electron README](https://github.com/electron/electron/blob/v9.0.3/README.md)
+[Electron README](https://github.com/electron/electron/blob/v9.0.4/README.md)
 
 > **NOTE**: The section about Widevine DRM in the regular Electron documentation does not apply to this fork of Electron since the Widevine components are now automatically installed and configured.
 
@@ -30,11 +30,11 @@ becomes:
 
 ```
 "dependencies": {
-  "electron": "https://github.com/castlabs/electron-releases#v9.0.3-wvvmp"
+  "electron": "https://github.com/castlabs/electron-releases#v9.0.4-wvvmp"
 }
 ```
 
-The `#v9.0.3-wvvmp` part of the URL references a specific release tag for Electron for Content Security, if it is left out the master branch will be tracked instead.
+The `#v9.0.4-wvvmp` part of the URL references a specific release tag for Electron for Content Security, if it is left out the master branch will be tracked instead.
 
 ## Migrating from an earlier castLabs Electron for Content Security release
 
@@ -66,7 +66,7 @@ Widevine CDM verification/installation/update is normally automatically triggere
 ### `app.verifyWidevineCdm([options])`
 
 * `options` Object (optional)
-  * `session` [Session](https://github.com/electron/electron/blob/v9.0.3/docs/api/session.md) (optional)
+  * `session` [Session](https://github.com/electron/electron/blob/v9.0.4/docs/api/session.md) (optional)
   * `disableUpdate` boolean (optional)
 
 Initiates asynchronous Widevine CDM verify/install/update procedure and returns no value. Once initiated Widevine related events will be emitted as necessary, namely `widevine-ready`, `widevine-update-pending` & `widevine-error`. Unless the `no-verify-widevine-cdm` command line parameter is set this API is automatically triggered on startup and should not be called manually. If customized options are necessary `no-verify-widevine-cdm` should be set and the API call made once, very early, after the app has received the `ready` event (but before loading any media-related content to avoid potentially requiring a restart).
diff --git a/electron.d.ts b/electron.d.ts
index bd6141f..5d96b35 100644
--- a/electron.d.ts
+++ b/electron.d.ts
@@ -1,4 +1,4 @@
-// Type definitions for Electron 9.0.3
+// Type definitions for Electron 9.0.4
 // Project: http://electronjs.org/
 // Definitions by: The Electron Team <https://github.com/electron/electron>
 // Definitions: https://github.com/electron/electron-typescript-definitions
@@ -12014,6 +12014,10 @@ See webContents.sendInputEvent for detailed description of `event` object.
      * Equivalent to KeyboardEvent.repeat.
      */
     isAutoRepeat: boolean;
+    /**
+     * Equivalent to KeyboardEvent.isComposing.
+     */
+    isComposing: boolean;
     /**
      * Equivalent to KeyboardEvent.shiftKey.
      */
diff --git a/package.json b/package.json
index 5dadb20..5431fb2 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
     "node": ">= 8.6"
   },
   "name": "electron",
-  "version": "9.0.3-wvvmp",
+  "version": "9.0.4-wvvmp",
   "repository": "https://github.com/castlabs/electron-releases",
   "description": "Build cross platform desktop apps with JavaScript, HTML, CSS, and Widevine DRM protection",
   "license": "MIT",