diff --git a/go.mod b/go.mod
index a877c2de2f..8d15776b78 100644
--- a/go.mod
+++ b/go.mod
@@ -59,7 +59,7 @@ require (
 	k8s.io/client-go v0.34.1
 	sigs.k8s.io/cli-utils v0.37.2
 	sigs.k8s.io/controller-runtime v0.22.3
-	sigs.k8s.io/kustomize/api v0.20.1
+	sigs.k8s.io/kustomize/api v0.21.0
 	sigs.k8s.io/yaml v1.6.0
 )
 
@@ -217,7 +217,7 @@ require (
 	k8s.io/kubectl v0.34.1
 	k8s.io/utils v0.0.0-20251002143259-bc988d571ff4 // indirect
 	sigs.k8s.io/json v0.0.0-20250730193827-2d320260d730 // indirect
-	sigs.k8s.io/kustomize/kyaml v0.20.1
+	sigs.k8s.io/kustomize/kyaml v0.21.0
 )
 
 // To avoid issues with the new vanity URL: dario.cat/mergo
diff --git a/go.sum b/go.sum
index 65c819e37b..650e6feab8 100644
--- a/go.sum
+++ b/go.sum
@@ -714,10 +714,10 @@ sigs.k8s.io/controller-runtime v0.22.3 h1:I7mfqz/a/WdmDCEnXmSPm8/b/yRTy6JsKKENTi
 sigs.k8s.io/controller-runtime v0.22.3/go.mod h1:+QX1XUpTXN4mLoblf4tqr5CQcyHPAki2HLXqQMY6vh8=
 sigs.k8s.io/json v0.0.0-20250730193827-2d320260d730 h1:IpInykpT6ceI+QxKBbEflcR5EXP7sU1kvOlxwZh5txg=
 sigs.k8s.io/json v0.0.0-20250730193827-2d320260d730/go.mod h1:mdzfpAEoE6DHQEN0uh9ZbOCuHbLK5wOm7dK4ctXE9Tg=
-sigs.k8s.io/kustomize/api v0.20.1 h1:iWP1Ydh3/lmldBnH/S5RXgT98vWYMaTUL1ADcr+Sv7I=
-sigs.k8s.io/kustomize/api v0.20.1/go.mod h1:t6hUFxO+Ph0VxIk1sKp1WS0dOjbPCtLJ4p8aADLwqjM=
-sigs.k8s.io/kustomize/kyaml v0.20.1 h1:PCMnA2mrVbRP3NIB6v9kYCAc38uvFLVs8j/CD567A78=
-sigs.k8s.io/kustomize/kyaml v0.20.1/go.mod h1:0EmkQHRUsJxY8Ug9Niig1pUMSCGHxQ5RklbpV/Ri6po=
+sigs.k8s.io/kustomize/api v0.21.0 h1:I7nry5p8iDJbuRdYS7ez8MUvw7XVNPcIP5GkzzuXIIQ=
+sigs.k8s.io/kustomize/api v0.21.0/go.mod h1:XGVQuR5n2pXKWbzXHweZU683pALGw/AMVO4zU4iS8SE=
+sigs.k8s.io/kustomize/kyaml v0.21.0 h1:7mQAf3dUwf0wBerWJd8rXhVcnkk5Tvn/q91cGkaP6HQ=
+sigs.k8s.io/kustomize/kyaml v0.21.0/go.mod h1:hmxADesM3yUN2vbA5z1/YTBnzLJ1dajdqpQonwBL1FQ=
 sigs.k8s.io/randfill v1.0.0 h1:JfjMILfT8A6RbawdsK2JXGBR5AQVfd+9TbzrlneTyrU=
 sigs.k8s.io/randfill v1.0.0/go.mod h1:XeLlZ/jmk4i1HRopwe7/aU3H5n1zNUcX6TM94b3QxOY=
 sigs.k8s.io/structured-merge-diff/v6 v6.3.0 h1:jTijUJbW353oVOd9oTlifJqOGEkUw2jB/fXCbTiQEco=