diff --git a/CHANGELOG.md b/CHANGELOG.md
index 39795bd..23b15f9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,11 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+## [1.3.1] - 2017-01-12
+### Fixed
+- Fixed an issue with objects containing prohibited keys nested inside other objects with prohibited keys. #2
+- Added a more robust check for plain objects.
+
 ## [1.3.0] - 2016-01-15
 ### Added
 - A new function `has`, which checks whether a passed object/array contains any keys with prohibited characters.
@@ -18,6 +23,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 Initial Release.
 
+[1.3.1]: https://github.com/fiznool/express-mongo-sanitize/compare/v1.3.0...v1.3.1
 [1.3.0]: https://github.com/fiznool/express-mongo-sanitize/compare/v1.2.0...v1.3.0
 [1.2.0]: https://github.com/fiznool/express-mongo-sanitize/compare/v1.1.0...v1.2.0
 [1.1.0]: https://github.com/fiznool/express-mongo-sanitize/compare/v1.0.0...v1.1.0
diff --git a/package.json b/package.json
index 47485e3..1d0c4b5 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "express-mongo-sanitize",
-  "version": "1.3.0",
+  "version": "1.3.1",
   "description": "Sanitize your express payload to prevent MongoDB operator injection.",
   "main": "index.js",
   "scripts": {