diff --git a/CHANGELOG.md b/CHANGELOG.md
index feaf271..f0247b9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,10 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+## [0.4.0] 2024-09-10
+
+### Changed
+
 - Support k8s 1.30 [#10](https://github.com/cybozu-go/zombie-detector/pull/10)
 
 ## [0.3.0] 2024-05-30
@@ -26,7 +30,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 - first implementation completed [#1](https://github.com/cybozu-go/zombie-detector/pull/1)
 
-[Unreleased]: https://github.com/cybozu-go/zombie-detector/compare/v0.3.0...HEAD
-[0.2.0]: https://github.com/cybozu-go/zombie-detector/compare/v0.2.0...v0.3.0
+[Unreleased]: https://github.com/cybozu-go/zombie-detector/compare/v0.4.0...HEAD
+[0.4.0]: https://github.com/cybozu-go/zombie-detector/compare/v0.3.0...v0.4.0
+[0.3.0]: https://github.com/cybozu-go/zombie-detector/compare/v0.2.0...v0.3.0
 [0.2.0]: https://github.com/cybozu-go/zombie-detector/compare/v0.1.0...v0.2.0
 [0.1.0]: https://github.com/cybozu-go/zombie-detector/compare/6d8c07c2507ed029b844e371de8faad79ad18ab9...v0.1.0
diff --git a/cmd/root.go b/cmd/root.go
index 370b815..515bf07 100644
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -26,7 +26,7 @@ var (
 		Use:     "zombie-detector",
 		Short:   "zombie-detector detects longly undeleted kubernetes resources",
 		RunE:    rootMain,
-		Version: "0.3.0",
+		Version: "0.4.0",
 	}
 )
 
diff --git a/config/default/kustomization.yaml b/config/default/kustomization.yaml
index 553185a..37c9951 100644
--- a/config/default/kustomization.yaml
+++ b/config/default/kustomization.yaml
@@ -5,4 +5,4 @@ resources:
 images:
   - name: zombie-detector:dev
     newName: ghcr.io/cybozu-go/zombie-detector
-    newTag: 0.3.0
+    newTag: 0.4.0