diff --git a/config/manager/kustomization.yaml b/config/manager/kustomization.yaml
index 01cb0561..7b8e4a78 100644
--- a/config/manager/kustomization.yaml
+++ b/config/manager/kustomization.yaml
@@ -5,4 +5,4 @@ resources:
 images:
   - name: fluxcd/kustomize-controller
     newName: fluxcd/kustomize-controller
-    newTag: v1.3.0
+    newTag: v1.4.0
diff --git a/go.mod b/go.mod
index ecaf1d0b..12d8aa7e 100644
--- a/go.mod
+++ b/go.mod
@@ -17,7 +17,7 @@ require (
 	github.com/cyphar/filepath-securejoin v0.3.2
 	github.com/dimchansky/utfbom v1.1.1
 	github.com/fluxcd/cli-utils v0.36.0-flux.9
-	github.com/fluxcd/kustomize-controller/api v1.3.0
+	github.com/fluxcd/kustomize-controller/api v1.4.0
 	github.com/fluxcd/pkg/apis/acl v0.3.0
 	github.com/fluxcd/pkg/apis/event v0.10.1
 	github.com/fluxcd/pkg/apis/kustomize v1.6.1