diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8399b37..68243e3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## [0.4.0](https://github.com/ably/ably-control-go/tree/v0.4.0)
+
+[Full Changelog](https://github.com/ably/ably-control-go/compare/v0.4.0..v0.3.0)
+
+**Merged pull requests:**
+
+- \[INF-4937\] - Add server-side batching [\#29](https://github.com/ably/ably-control-go/pull/29) ([surminus](https://github.com/surminus))
+
 ## [0.3.0](https://github.com/ably/ably-control-go/tree/v0.3.0)
 
 [Full Changelog](https://github.com/ably/ably-control-go/compare/v0.3.0..v0.2.0)
diff --git a/version.go b/version.go
index 858c15c..44d6a44 100644
--- a/version.go
+++ b/version.go
@@ -3,4 +3,4 @@ package control
 // VERSION is the version of this package.
 //
 // It is sent in requests to the Control API in the Ably-Agent HTTP header.
-const VERSION = "0.3.0"
+const VERSION = "0.4.0"