diff --git a/go.mod b/go.mod
index 0240e4c66..6078bbb8d 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module gopkg.in/k8snetworkplumbingwg/multus-cni.v4
 
-go 1.25.0
+go 1.25
 
 require (
 	github.com/blang/semver v3.5.1+incompatible
diff --git a/pkg/multus/multus_cni100_test.go b/pkg/multus/multus_cni100_test.go
index 75881938f..61d3f0cae 100644
--- a/pkg/multus/multus_cni100_test.go
+++ b/pkg/multus/multus_cni100_test.go
@@ -64,11 +64,10 @@ func newPodInformer(ctx context.Context, kclient kubernetes.Interface) cache.Sha
 
 	informerFactory.Start(ctx.Done())
 
-	waitCtx, waitCancel := context.WithTimeout(ctx, 20*time.Second)
-	if !cache.WaitForCacheSync(waitCtx.Done(), podInformer.HasSynced) {
-		logging.Errorf("failed to sync pod informer cache")
-	}
-	waitCancel()
+	// Note: Do NOT call WaitForCacheSync here with fake clients in K8s 1.34+.
+	// WaitForCacheSync waits for bookmark events that fake clients don't send, causing 20s timeouts.
+	// Fake clients also don't properly populate informer caches via LIST/WATCH operations.
+	// Tests must manually populate informer caches using informer.GetStore().Add().
 
 	return podInformer
 }
@@ -86,11 +85,10 @@ func newNetDefInformer(ctx context.Context, client netdefclient.Interface) cache
 
 	informerFactory.Start(ctx.Done())
 
-	waitCtx, waitCancel := context.WithTimeout(ctx, 20*time.Second)
-	if !cache.WaitForCacheSync(waitCtx.Done(), netdefInformer.HasSynced) {
-		logging.Errorf("failed to sync pod informer cache")
-	}
-	waitCancel()
+	// Note: Do NOT call WaitForCacheSync here with fake clients in K8s 1.34+.
+	// WaitForCacheSync waits for bookmark events that fake clients don't send, causing 20s timeouts.
+	// Fake clients also don't properly populate informer caches via LIST/WATCH operations.
+	// Tests must manually populate informer caches using informer.GetStore().Add().
 
 	return netdefInformer
 }
@@ -939,14 +937,23 @@ var _ = Describe("multus operations cniVersion 1.0.0 config", func() {
 		fExec.addPlugin100(nil, "eth0", net1, expectedResult1, nil)
 
 		fKubeClient := NewFakeClientInfo()
-		fKubeClient.AddPod(fakePod)
-		_, err := fKubeClient.AddNetAttachDef(testhelpers.NewFakeNetAttachDef("kube-system", "net1", net1))
-		Expect(err).NotTo(HaveOccurred())
 
 		podInformer := newPodInformer(ctx, fKubeClient.Client)
 		netdefInformer := newNetDefInformer(ctx, fKubeClient.NetClient)
 		fKubeClient.SetK8sClientInformers(podInformer, netdefInformer)
 
+		// In K8s 1.34+, fake clients don't properly populate informer caches via LIST/WATCH.
+		// Manually add objects to both the fake client AND the informer cache stores.
+		fKubeClient.AddPod(fakePod)
+		err := podInformer.GetStore().Add(fakePod)
+		Expect(err).NotTo(HaveOccurred())
+
+		netDef := testhelpers.NewFakeNetAttachDef("kube-system", "net1", net1)
+		_, err = fKubeClient.AddNetAttachDef(netDef)
+		Expect(err).NotTo(HaveOccurred())
+		err = netdefInformer.GetStore().Add(netDef)
+		Expect(err).NotTo(HaveOccurred())
+
 		result, err := CmdAdd(args, fExec, fKubeClient)
 		Expect(err).NotTo(HaveOccurred())
 		Expect(fExec.addIndex).To(Equal(len(fExec.plugins)))
@@ -990,19 +997,28 @@ var _ = Describe("multus operations cniVersion 1.0.0 config", func() {
 		fExec.addPlugin100(nil, "eth0", net1, expectedResult1, nil)
 
 		fKubeClient := NewFakeClientInfo()
-		_, err := fKubeClient.AddNetAttachDef(testhelpers.NewFakeNetAttachDef("kube-system", "net1", net1))
-		Expect(err).NotTo(HaveOccurred())
 
 		podInformer := newPodInformer(ctx, fKubeClient.Client)
 		netdefInformer := newNetDefInformer(ctx, fKubeClient.NetClient)
 		fKubeClient.SetK8sClientInformers(podInformer, netdefInformer)
 
+		// In K8s 1.34+, fake clients don't properly populate informer caches via LIST/WATCH.
+		// Manually add NetAttachDef to both fake client AND informer cache.
+		netDef := testhelpers.NewFakeNetAttachDef("kube-system", "net1", net1)
+		_, err := fKubeClient.AddNetAttachDef(netDef)
+		Expect(err).NotTo(HaveOccurred())
+		err = netdefInformer.GetStore().Add(netDef)
+		Expect(err).NotTo(HaveOccurred())
+
+		// Add pod AFTER a delay to simulate "pod not immediately found" scenario.
+		// Add to both fake client and informer cache when it becomes available.
 		wg := sync.WaitGroup{}
 		wg.Add(1)
 		go func() {
 			wg.Done()
 			time.Sleep(1 * time.Second)
 			fKubeClient.AddPod(fakePod)
+			podInformer.GetStore().Add(fakePod)
 		}()
 		wg.Wait()
 
diff --git a/vendor/github.com/prometheus/procfs/Makefile.common b/vendor/github.com/prometheus/procfs/Makefile.common
index 0ed55c2ba..81bad5f42 100644
--- a/vendor/github.com/prometheus/procfs/Makefile.common
+++ b/vendor/github.com/prometheus/procfs/Makefile.common
@@ -33,7 +33,7 @@ GOHOSTOS     ?= $(shell $(GO) env GOHOSTOS)
 GOHOSTARCH   ?= $(shell $(GO) env GOHOSTARCH)
 
 GO_VERSION        ?= $(shell $(GO) version)
-GO_VERSION_NUMBER ?= $(word 3, $(GO_VERSION))Error Parsing File
+GO_VERSION_NUMBER ?= $(word 3, $(GO_VERSION))
 PRE_GO_111        ?= $(shell echo $(GO_VERSION_NUMBER) | grep -E 'go1\.(10|[0-9])\.')
 
 PROMU        := $(FIRST_GOPATH)/bin/promu