diff --git a/.version b/.version
index 9ed87d7..372b6ea 100644
--- a/.version
+++ b/.version
@@ -1,3 +1,3 @@
 {
-  "version": "v0.3.1"
+  "version": "v0.4.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index fc35741..149633a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,17 @@
 
 All notable changes to this project will be documented in this file.
 
+## [0.4.0] - 2026-06-16
+
+### 🚀 Features
+
+- *(metrics)* Add SubscriptionMetrics OTel observer for subscriptions (#150)
+
+### 🐛 Bug Fixes
+
+- *(deps)* Update opentelemetry-go monorepo (#146)
+- *(deps)* Update module github.com/99designs/gqlgen to v0.17.91 (#148)
+
 ## [0.3.1] - 2026-05-29
 
 ### 🐛 Bug Fixes