diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 0ee8c01..2537c1f 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.3.0"
+  ".": "0.4.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 03043d7..6486acd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [0.4.0](https://github.com/IBM/simrun/compare/v0.3.0...v0.4.0) (2026-06-25)
+
+
+### Features
+
+* **ci:** add GitHub Actions workflow for Docker image publishing ([#16](https://github.com/IBM/simrun/issues/16)) ([ff3602e](https://github.com/IBM/simrun/commit/ff3602e9c9ad8eba7df1022d68e71df4787a067c))
+
 ## [0.3.0](https://github.com/IBM/simrun/compare/v0.2.1...v0.3.0) (2026-06-23)