diff --git a/CHANGELOG.md b/CHANGELOG.md
index d1046db..db2412f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 ### Changed
 - README.md introduction and requirements
+- Use ujson instead of json
 
 ## [0.4.1] - 2018-09-26
 ### Changed