diff --git a/CHANGES.md b/CHANGES.md
index 9244d28..134f71b 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,7 @@
+## 0.2.1 (2019-02-16)
+
+* move build system to dune
+
 ## 0.2.0 (2018-06-24)
 
 * New function `update`.