diff --git a/go.mod b/go.mod
index b0933e8f12..be34ac53ea 100644
--- a/go.mod
+++ b/go.mod
@@ -30,8 +30,8 @@ require (
 	golang.org/x/term v0.0.0-20210220032956-6a3ed077a48d
 	golang.org/x/time v0.0.0-20210220033141-f8bda1e9f3ba
 	google.golang.org/protobuf v1.26.0
-	k8s.io/api v0.0.0-20210707174547-c7120651ba6c
-	k8s.io/apimachinery v0.0.0-20210701054147-830375057167
+	k8s.io/api v0.0.0-20210708014407-1e1dad4bd9d1
+	k8s.io/apimachinery v0.0.0-20210708014216-0dafcb48b31e
 	k8s.io/klog/v2 v2.9.0
 	k8s.io/utils v0.0.0-20210521133846-da695404a2bc
 	sigs.k8s.io/structured-merge-diff/v4 v4.1.2
@@ -39,6 +39,6 @@ require (
 )
 
 replace (
-	k8s.io/api => k8s.io/api v0.0.0-20210707174547-c7120651ba6c
-	k8s.io/apimachinery => k8s.io/apimachinery v0.0.0-20210701054147-830375057167
+	k8s.io/api => k8s.io/api v0.0.0-20210708014407-1e1dad4bd9d1
+	k8s.io/apimachinery => k8s.io/apimachinery v0.0.0-20210708014216-0dafcb48b31e
 )
diff --git a/go.sum b/go.sum
index 93f90fdc45..e9b1c4f4ec 100644
--- a/go.sum
+++ b/go.sum
@@ -444,10 +444,10 @@ honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWh
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
 honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
-k8s.io/api v0.0.0-20210707174547-c7120651ba6c h1:fSuqMc1G40Cl6BY7TuYWLdo+wcWUfaWijwWPMGm3hrE=
-k8s.io/api v0.0.0-20210707174547-c7120651ba6c/go.mod h1:zoURDvOPW5UMFZr2YUU/sStjYnWSPt+x+MM4R94ATgQ=
-k8s.io/apimachinery v0.0.0-20210701054147-830375057167 h1:fob/j8+uMBIVvyo+9bG7GvjFSj0LX3RNuSXW+RcUrwo=
-k8s.io/apimachinery v0.0.0-20210701054147-830375057167/go.mod h1:O3oNtNadZdeOMxHFVxOreoznohCpy0z6mocxbZr7oJ0=
+k8s.io/api v0.0.0-20210708014407-1e1dad4bd9d1 h1:BsVbhrF9ZXWlpo/84y3WdGGw+SYu61RlNKOMqGKDIQE=
+k8s.io/api v0.0.0-20210708014407-1e1dad4bd9d1/go.mod h1:UGtjmHCgj1IMXqa0rRAXNNszZBo1IKpAhbvSre33vSU=
+k8s.io/apimachinery v0.0.0-20210708014216-0dafcb48b31e h1:EZ+ZrcPtnkR8vVo7bBSwoMD9a0HaC29O6lJhcZgwsJQ=
+k8s.io/apimachinery v0.0.0-20210708014216-0dafcb48b31e/go.mod h1:O3oNtNadZdeOMxHFVxOreoznohCpy0z6mocxbZr7oJ0=
 k8s.io/gengo v0.0.0-20200413195148-3a45101e95ac/go.mod h1:ezvh/TsK7cY6rbqRK0oQQ8IAqLxYwwyPxAX1Pzy0ii0=
 k8s.io/klog/v2 v2.0.0/go.mod h1:PBfzABfn139FHAV07az/IF9Wp1bkk3vpT2XSJ76fSDE=
 k8s.io/klog/v2 v2.9.0 h1:D7HV+n1V57XeZ0m6tdRkfknthUaM06VFbWldOFh8kzM=
diff --git a/testing/fixture.go b/testing/fixture.go
index caa045117e..fe7f0cd322 100644
--- a/testing/fixture.go
+++ b/testing/fixture.go
@@ -400,7 +400,8 @@ func (t *tracker) add(gvr schema.GroupVersionResource, obj runtime.Object, ns st
 	if _, ok = t.objects[gvr][namespacedName]; ok {
 		if replaceExisting {
 			for _, w := range t.getWatches(gvr, ns) {
-				w.Modify(obj)
+				// To avoid the object from being accidentally modified by watcher
+				w.Modify(obj.DeepCopyObject())
 			}
 			t.objects[gvr][namespacedName] = obj
 			return nil
@@ -416,7 +417,8 @@ func (t *tracker) add(gvr schema.GroupVersionResource, obj runtime.Object, ns st
 	t.objects[gvr][namespacedName] = obj
 
 	for _, w := range t.getWatches(gvr, ns) {
-		w.Add(obj)
+		// To avoid the object from being accidentally modified by watcher
+		w.Add(obj.DeepCopyObject())
 	}
 
 	return nil
@@ -456,7 +458,7 @@ func (t *tracker) Delete(gvr schema.GroupVersionResource, ns, name string) error
 
 	delete(objs, namespacedName)
 	for _, w := range t.getWatches(gvr, ns) {
-		w.Delete(obj)
+		w.Delete(obj.DeepCopyObject())
 	}
 	return nil
 }