diff --git a/CHANGELOG.md b/CHANGELOG.md
index cd796da..9696b9a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,14 @@
 
 **Note**: Gaps between patch versions are faulty/broken releases.
 
+## v0.9.0
+
+**Warning**. If you don't rely in your codebase on the property `maybe(MyType)(undefined) === null` this **is not a breaking change** for you.
+
+- **Breaking Change**
+    - upgrade to `tcomb-doc` v0.5.0
+    - upgrade to `tcomb-validation` v3.0.0
+
 ## v0.8.13
 
 - **Bug Fix**
diff --git a/package.json b/package.json
index 29fbb9e..3471959 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "tcomb-react",
-  "version": "0.8.13",
+  "version": "0.9.0",
   "description": "Type checking for React components",
   "main": "index.js",
   "files": [
@@ -24,8 +24,8 @@
   "dependencies": {
     "doctrine": "0.7.2",
     "get-comments": "1.0.1",
-    "tcomb-doc": "^0.4.0",
-    "tcomb-validation": "^2.2.0",
+    "tcomb-doc": "^0.5.0",
+    "tcomb-validation": "^3.0.0",
     "react": ">=0.13.0"
   },
   "devDependencies": {