diff --git a/README.md b/README.md
index d462cf5..8ce6662 100644
--- a/README.md
+++ b/README.md
@@ -93,7 +93,7 @@ _* This will create a new object rather than mutating existing ones so you're sa
 ## API
 
 ``` js
-import createPropTypes, {getComponentSchema, Schema, SchemaSymbol} from 'react-json-schema-proptypes';
+import createPropTypes, {getComponentSchema, Schema, SchemaSymbol, ajv} from 'react-json-schema-proptypes';
 
 ```
 
@@ -120,6 +120,8 @@ Is a schema that validates a React node.  (Gives a schema represetation equivale
 #### Schema.func
 Is a schema that validates a function.
 
+### ajv
+The internally used instance of Ajv(https://github.com/epoberezkin/ajv). This instance may be configured e.g. to support nested schema's (See (https://github.com/epoberezkin/ajv#api)[https://github.com/epoberezkin/ajv#api])  
 
 ## Caveats
 
diff --git a/package.json b/package.json
index bf5bf08..aa551ed 100644
--- a/package.json
+++ b/package.json
@@ -41,7 +41,7 @@
     "sinon": "^1.17.3"
   },
   "dependencies": {
-    "ajv": "^3.8.5",
+    "ajv": "^5.2.2",
     "ajv-i18n": "^1.2.0",
     "faker": "^3.1.0",
     "json-schema-faker": "^0.3.0",
diff --git a/src/ajvEx.js b/src/ajvEx.js
index e6103dd..276eff2 100644
--- a/src/ajvEx.js
+++ b/src/ajvEx.js
@@ -2,7 +2,10 @@ import AJV from 'ajv';
 import * as React from 'react';
 import isFunction from 'lodash/isFunction';
 
-const ajv = AJV({errorDataPath: 'property'}); // restore pre v2.0 behavior
+const ajv = AJV({
+  errorDataPath: 'property', // restore pre v2.0 behavior
+  unknownFormats: 'ignore' // restore pre v5.0 behavior
+});
 
 function safeEscapeQuotes(str) {
   return str.replace(/\\([\s\S])|(')/g,"\\$1$2").replace(/\\([\s\S])|(")/g,"\\$1$2"); // escape only if not escaped already
@@ -21,4 +24,4 @@ ajv.addKeyword('isFunction', { compile: function() {
   return isFunction;
 }});
 
-export default ajv;
\ No newline at end of file
+export default ajv;
diff --git a/src/index.js b/src/index.js
index 9659e0a..944c19a 100644
--- a/src/index.js
+++ b/src/index.js
@@ -4,7 +4,7 @@ import omitDeprecated from './util';
 
 export * as Schema from './schemas';
 export fake from './fake';
-
+export { ajv };
 export const SchemaSymbol = Symbol.for('react-json-schema-proptypes');
 
 function name(component) {