diff --git a/README.md b/README.md
index d1236a3..250c97c 100644
--- a/README.md
+++ b/README.md
@@ -212,6 +212,14 @@ console.log(decryptedData); // [{id: 1}, {id: 2}]
 
 ## Release notes
 
+### 4.0.0
+
+This is an update including breaking changes for some environments.
+
+In this version `Math.random()` has been replaced by the random methods of the native crypto module.
+
+For this reason CryptoJS might does not run in some JavaScript environments without native crypto module. Such as IE 10 or before or React Native.
+
 ### 3.3.0
 
 Rollback, `3.3.0` is the same as `3.1.9-1`.
diff --git a/package.json b/package.json
index 0587636..b7686de 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "crypto-js",
   "title": "crypto-js",
   "description": "JavaScript library of crypto standards.",
-  "version": "3.3.0",
+  "version": "4.0.0",
   "homepage": "http://github.com/brix/crypto-js",
   "author": {
     "name": "Evan Vosberg",