diff --git a/e2e/namespace_user_metadata_test.go b/e2e/namespace_user_metadata_test.go
index 2abcea68..55243f79 100644
--- a/e2e/namespace_user_metadata_test.go
+++ b/e2e/namespace_user_metadata_test.go
@@ -7,11 +7,15 @@ package e2e
 
 import (
 	"context"
+	"time"
 
-	capsulev1beta1 "github.com/clastix/capsule/api/v1beta1"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+	rbacv1 "k8s.io/api/rbac/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/types"
+
+	capsulev1beta1 "github.com/clastix/capsule/api/v1beta1"
 )
 
 var _ = Describe("creating a Namespace with user-specified labels and annotations", func() {
@@ -58,7 +62,7 @@ var _ = Describe("creating a Namespace with user-specified labels and annotation
 		})
 	})
 
-	It("should fail", func() {
+	It("should fail when creating a Namespace", func() {
 		By("specifying forbidden labels using exact match", func() {
 			ns := NewNamespace("namespace-user-metadata-forbidden-labels")
 			ns.SetLabels(map[string]string{"foo": "bar"})
@@ -80,4 +84,118 @@ var _ = Describe("creating a Namespace with user-specified labels and annotation
 			NamespaceCreation(ns, tnt.Spec.Owners[0], defaultTimeoutInterval).ShouldNot(Succeed())
 		})
 	})
+
+	It("should fail when updating a Namespace", func() {
+		role := &rbacv1.Role{
+			ObjectMeta: metav1.ObjectMeta{
+				Name: "ns-patch",
+			},
+			Rules: []rbacv1.PolicyRule{
+				{
+					Verbs:     []string{"patch", "update"},
+					APIGroups: []string{""},
+					Resources: []string{"namespaces"},
+				},
+			},
+		}
+
+		roleBinding := &rbacv1.RoleBinding{
+			ObjectMeta: metav1.ObjectMeta{
+				Name: "ns-patch",
+			},
+			Subjects: []rbacv1.Subject{
+				{
+					APIGroup: "rbac.authorization.k8s.io",
+					Kind:     tnt.Spec.Owners[0].Kind.String(),
+					Name:     tnt.Spec.Owners[0].Name,
+				},
+			},
+			RoleRef: rbacv1.RoleRef{
+				APIGroup: "rbac.authorization.k8s.io",
+				Kind:     "Role",
+				Name:     role.GetName(),
+			},
+		}
+
+		rbacPatch := func(ns string) {
+			role := role.DeepCopy()
+			role.SetNamespace(ns)
+			Expect(k8sClient.Create(context.Background(), role)).To(Succeed())
+
+			roleBinding := roleBinding.DeepCopy()
+			roleBinding.SetNamespace(ns)
+			Expect(k8sClient.Create(context.Background(), roleBinding)).To(Succeed())
+		}
+
+		cs := ownerClient(tnt.Spec.Owners[0])
+
+		By("specifying forbidden labels using exact match", func() {
+			ns := NewNamespace("forbidden-labels-exact-match")
+
+			NamespaceCreation(ns, tnt.Spec.Owners[0], defaultTimeoutInterval).Should(Succeed())
+			rbacPatch(ns.GetName())
+			Consistently(func() error {
+				if err := k8sClient.Get(context.Background(), types.NamespacedName{Name: ns.GetName()}, ns); err != nil {
+					return nil
+				}
+
+				ns.SetLabels(map[string]string{"foo": "bar"})
+
+				_, err := cs.CoreV1().Namespaces().Update(context.Background(), ns, metav1.UpdateOptions{})
+
+				return err
+			}, 10*time.Second, time.Second).ShouldNot(Succeed())
+		})
+		By("specifying forbidden labels using regex match", func() {
+			ns := NewNamespace("forbidden-labels-regex-match")
+
+			NamespaceCreation(ns, tnt.Spec.Owners[0], defaultTimeoutInterval).Should(Succeed())
+			rbacPatch(ns.GetName())
+			Consistently(func() error {
+				if err := k8sClient.Get(context.Background(), types.NamespacedName{Name: ns.GetName()}, ns); err != nil {
+					return nil
+				}
+
+				ns.SetLabels(map[string]string{"gatsby-foo": "bar"})
+
+				_, err := cs.CoreV1().Namespaces().Update(context.Background(), ns, metav1.UpdateOptions{})
+
+				return err
+			}, 3*time.Second, time.Second).ShouldNot(Succeed())
+		})
+		By("specifying forbidden annotations using exact match", func() {
+			ns := NewNamespace("forbidden-annotations-exact-match")
+
+			NamespaceCreation(ns, tnt.Spec.Owners[0], defaultTimeoutInterval).Should(Succeed())
+			rbacPatch(ns.GetName())
+			Consistently(func() error {
+				if err := k8sClient.Get(context.Background(), types.NamespacedName{Name: ns.GetName()}, ns); err != nil {
+					return nil
+				}
+
+				ns.SetAnnotations(map[string]string{"foo": "bar"})
+
+				_, err := cs.CoreV1().Namespaces().Update(context.Background(), ns, metav1.UpdateOptions{})
+
+				return err
+			}, 10*time.Second, time.Second).ShouldNot(Succeed())
+		})
+		By("specifying forbidden annotations using regex match", func() {
+			ns := NewNamespace("forbidden-annotations-regex-match")
+
+			NamespaceCreation(ns, tnt.Spec.Owners[0], defaultTimeoutInterval).Should(Succeed())
+			rbacPatch(ns.GetName())
+			Consistently(func() error {
+				if err := k8sClient.Get(context.Background(), types.NamespacedName{Name: ns.GetName()}, ns); err != nil {
+					return nil
+				}
+
+				ns.SetAnnotations(map[string]string{"gatsby-foo": "bar"})
+
+				_, err := cs.CoreV1().Namespaces().Update(context.Background(), ns, metav1.UpdateOptions{})
+
+				return err
+			}, 10*time.Second, time.Second).ShouldNot(Succeed())
+		})
+	})
 })