diff --git a/CHANGELOG.md b/CHANGELOG.md
index b68550c821b..f6caadbb2cb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # rollup changelog
 
+## 0.51.5
+
+* Fix regressions with uninitialised conditional expressions ([#1720](https://github.com/rollup/rollup/pull/1720))
+
 ## 0.51.4
 
 * Fix regressions preventing builds ([#1725](https://github.com/rollup/rollup/pull/1725))