diff --git a/cmd/addon-manager/main.go b/cmd/addon-manager/main.go
index 2227acbc..c52aef99 100644
--- a/cmd/addon-manager/main.go
+++ b/cmd/addon-manager/main.go
@@ -47,6 +47,11 @@ func main() {
 	logger := klogr.New()
 	klog.SetOutput(os.Stdout)
 	klog.InitFlags(flag.CommandLine)
+	// Opt into the new klog behavior so that -stderrthreshold is honored even
+	// when -logtostderr=true (the default).
+	// Ref: kubernetes/klog#212, kubernetes/klog#432
+	flag.CommandLine.Set("legacy_stderr_threshold_behavior", "false") //nolint:errcheck
+	flag.CommandLine.Set("stderrthreshold", "INFO")                   //nolint:errcheck
 	flag.StringVar(&metricsAddr, "metrics-bind-address", ":48080", "The address the metric endpoint binds to.")
 	flag.StringVar(&probeAddr, "health-probe-bind-address", ":48081", "The address the probe endpoint binds to.")
 	flag.BoolVar(&enableLeaderElection, "leader-elect", false,
diff --git a/go.mod b/go.mod
index cda5acf3..4250af2e 100644
--- a/go.mod
+++ b/go.mod
@@ -18,7 +18,7 @@ require (
 	k8s.io/client-go v0.31.10
 	k8s.io/component-base v0.31.10
 	k8s.io/klog v1.0.0
-	k8s.io/klog/v2 v2.130.1
+	k8s.io/klog/v2 v2.140.0
 	k8s.io/kube-aggregator v0.31.10
 	k8s.io/kube-openapi v0.0.0-20250610211856-8b98d1ed966a
 	k8s.io/utils v0.0.0-20250604170112-4c0f3b243397
diff --git a/go.sum b/go.sum
index 304a6aa2..eb39ad34 100644
--- a/go.sum
+++ b/go.sum
@@ -309,8 +309,8 @@ k8s.io/component-base v0.31.10 h1:8daIQBYMhcnuXMD1otGkjpx4d4b0UIcg18xieLTAGA0=
 k8s.io/component-base v0.31.10/go.mod h1:qoSFFg2SO854XgeCJwFL/LPY/oJU1vqJHhNCEgI6xhA=
 k8s.io/klog v1.0.0 h1:Pt+yjF5aB1xDSVbau4VsWe+dQNzA0qv1LlXdC2dF6Q8=
 k8s.io/klog v1.0.0/go.mod h1:4Bi6QPql/J/LkTDqv7R/cd3hPo4k2DG6Ptcz060Ez5I=
-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/kms v0.31.10 h1:jD/+hMQ8WT4ht419sXNs1u4dqeJidG34rFcnb2nP6CM=
 k8s.io/kms v0.31.10/go.mod h1:OZKwl1fan3n3N5FFxnW5C4V3ygrah/3YXeJWS3O6+94=
 k8s.io/kube-aggregator v0.31.10 h1:NeqnNYGEpJx8NTN56q48vR1XFyLG/8Rif/5iazNSTwE=
diff --git a/pkg/config/args_log.go b/pkg/config/args_log.go
index 0007d1cb..27469529 100644
--- a/pkg/config/args_log.go
+++ b/pkg/config/args_log.go
@@ -27,5 +27,10 @@ import (
 func AddLogFlags(set *pflag.FlagSet) {
 	fs := flag.NewFlagSet("", 0)
 	klog.InitFlags(fs)
+	// Opt into the new klog behavior so that -stderrthreshold is honored even
+	// when -logtostderr=true (the default).
+	// Ref: kubernetes/klog#212, kubernetes/klog#432
+	_ = fs.Set("legacy_stderr_threshold_behavior", "false")
+	_ = fs.Set("stderrthreshold", "INFO")
 	set.AddGoFlagSet(fs)
 }