diff --git a/CHANGELOG.md b/CHANGELOG.md
index edd5214..7fc34fb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,8 @@
-## [Unreleased]
+## [0.4.0] - 2024-09-23
 
-- added heartbeat timer
+- (re)added a "hearbeat" feature (removed earlier in 0.2.0) to fix the occasional issue when the websocket stops receiving data, but doesn't disconnect (not enabled by default, turn it on by setting `check_heartbeat` to true)
+- added a way to set the user agent sent when connecting using the `user_agent` field (default is `"Skyfall/#{version}"`)
+- added `app.bsky.feed.postgate` record type
 
 ## [0.3.1] - 2024-06-28
 
diff --git a/lib/skyfall/version.rb b/lib/skyfall/version.rb
index d6f2f9c..bc0a57e 100644
--- a/lib/skyfall/version.rb
+++ b/lib/skyfall/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Skyfall
-  VERSION = "0.3.1"
+  VERSION = "0.4.0"
 end