diff --git a/CHANGELOG.md b/CHANGELOG.md
index bcdc4e1c30..5a9432676f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+## [2.5.9] - 2018-03-06
+
 ### Changed
 - Updated json-schema validation library, now using [RE2/J](https://github.com/google/re2j) for regex pattern matching