diff --git a/CHANGELOG.md b/CHANGELOG.md
index 14f54d7ba..ac73a954e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # Changelog
 
-## 2.4.0 (2019-08-16)
+## 2.4.0 (unreleased)
 
 ### New features:
  * `Address.toPayable`: added a helper to convert between address types without having to resort to low-level casting. ([#1773](https://github.com/OpenZeppelin/openzeppelin-solidity/pull/1773))