diff --git a/cmd/controller-manager/app/options/common.go b/cmd/controller-manager/app/options/common.go
index 1cb3b8737..07fb40bd5 100644
--- a/cmd/controller-manager/app/options/common.go
+++ b/cmd/controller-manager/app/options/common.go
@@ -157,6 +157,13 @@ func InitGOPS() error {
 func AddKlogFlags(fs *pflag.FlagSet) {
 	local := flag.NewFlagSet("klog", flag.ExitOnError)
 	klog.InitFlags(local)
+
+	// Opt into the new klog behavior so that -stderrthreshold is honored even
+	// when -logtostderr=true (the default).
+	// Ref: kubernetes/klog#212, kubernetes/klog#432
+	_ = local.Set("legacy_stderr_threshold_behavior", "false")
+	_ = local.Set("stderrthreshold", "INFO")
+
 	local.VisitAll(func(fl *flag.Flag) {
 		fl.Name = strings.ReplaceAll(fl.Name, "_", "-")
 		fs.AddGoFlag(fl)
diff --git a/cmd/kk/app/options/other.go b/cmd/kk/app/options/other.go
index 69ba1a54d..85a383421 100644
--- a/cmd/kk/app/options/other.go
+++ b/cmd/kk/app/options/other.go
@@ -158,6 +158,13 @@ func InitGOPS() error {
 func AddKlogFlags(fs *pflag.FlagSet) {
 	local := flag.NewFlagSet("klog", flag.ExitOnError)
 	klog.InitFlags(local)
+
+	// Opt into the new klog behavior so that -stderrthreshold is honored even
+	// when -logtostderr=true (the default).
+	// Ref: kubernetes/klog#212, kubernetes/klog#432
+	_ = local.Set("legacy_stderr_threshold_behavior", "false")
+	_ = local.Set("stderrthreshold", "INFO")
+
 	local.VisitAll(func(fl *flag.Flag) {
 		fl.Name = strings.ReplaceAll(fl.Name, "_", "-")
 		fs.AddGoFlag(fl)
diff --git a/go.mod b/go.mod
index e156f9ce6..8e0b538c1 100644
--- a/go.mod
+++ b/go.mod
@@ -30,7 +30,7 @@ require (
 	k8s.io/apiserver v0.35.0
 	k8s.io/client-go v0.35.0
 	k8s.io/component-base v0.35.0
-	k8s.io/klog/v2 v2.130.1
+	k8s.io/klog/v2 v2.140.0
 	k8s.io/utils v0.0.0-20251002143259-bc988d571ff4
 	oras.land/oras-go/v2 v2.6.0
 	sigs.k8s.io/cluster-api v1.9.2
diff --git a/go.sum b/go.sum
index 5156c68ac..98e6df7f2 100644
--- a/go.sum
+++ b/go.sum
@@ -460,8 +460,8 @@ k8s.io/cluster-bootstrap v0.31.3 h1:O1Yxk1bLaxZvmQCXLaJjj5iJD+lVMfJdRUuKgbUHPlA=
 k8s.io/cluster-bootstrap v0.31.3/go.mod h1:TI6TCsQQB4FfcryWgNO3SLXSKWBqHjx4DfyqSFwixj8=
 k8s.io/component-base v0.35.0 h1:+yBrOhzri2S1BVqyVSvcM3PtPyx5GUxCK2tinZz1G94=
 k8s.io/component-base v0.35.0/go.mod h1:85SCX4UCa6SCFt6p3IKAPej7jSnF3L8EbfSyMZayJR0=
-k8s.io/klog/v2 v2.130.1 h1:n9Xl7H1Xvksem4KFG4PYbdQCQxqc/tTUyrgXaOhHSzk=
-k8s.io/klog/v2 v2.130.1/go.mod h1:3Jpz1GvMt720eyJH1ckRHK1EDfpxISzJ7I9OYgaDtPE=
+k8s.io/klog/v2 v2.140.0 h1:Tf+J3AH7xnUzZyVVXhTgGhEKnFqye14aadWv7bzXdzc=
+k8s.io/klog/v2 v2.140.0/go.mod h1:o+/RWfJ6PwpnFn7OyAG3QnO47BFsymfEfrz6XyYSSp0=
 k8s.io/kube-openapi v0.0.0-20250910181357-589584f1c912 h1:Y3gxNAuB0OBLImH611+UDZcmKS3g6CthxToOb37KgwE=
 k8s.io/kube-openapi v0.0.0-20250910181357-589584f1c912/go.mod h1:kdmbQkyfwUagLfXIad1y2TdrjPFWp2Q89B3qkRwf/pQ=
 k8s.io/utils v0.0.0-20251002143259-bc988d571ff4 h1:SjGebBtkBqHFOli+05xYbK8YF1Dzkbzn+gDM4X9T4Ck=