diff --git a/CHANGELOG.md b/CHANGELOG.md
index 43896b7d..b5236a11 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,14 @@
 
 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
 
+### [18.1.1](https://www.github.com/yargs/yargs-parser/compare/v18.1.0...v18.1.1) (2020-03-16)
+
+
+### Bug Fixes
+
+* \_\_proto\_\_ will now be replaced with \_\_\_proto\_\_\_ in parse ([#258](https://www.github.com/yargs/yargs-parser/issues/258)), patching a potential 
+prototype pollution vulnerability. This was reported by the Snyk Security Research Team.([63810ca](https://www.github.com/yargs/yargs-parser/commit/63810ca1ae1a24b08293a4d971e70e058c7a41e2))
+
 ## [18.1.0](https://www.github.com/yargs/yargs-parser/compare/v18.0.0...v18.1.0) (2020-03-07)
 
 
diff --git a/package.json b/package.json
index da51adfe..778f1ef0 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "yargs-parser",
-  "version": "18.1.0",
+  "version": "18.1.1",
   "description": "the mighty option parser used by yargs",
   "main": "index.js",
   "scripts": {