diff --git a/api/openapi-spec/swagger.json b/api/openapi-spec/swagger.json
index 81725d39730..ba625f8113f 100644
--- a/api/openapi-spec/swagger.json
+++ b/api/openapi-spec/swagger.json
@@ -497,6 +497,9 @@
           "description": "Standard list metadata. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds"
         }
       },
+      "required": [
+        "items"
+      ],
       "type": "object",
       "x-kubernetes-group-version-kind": [
         {
@@ -555,6 +558,9 @@
           "description": "Standard list metadata. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds"
         }
       },
+      "required": [
+        "items"
+      ],
       "type": "object",
       "x-kubernetes-group-version-kind": [
         {
@@ -1136,6 +1142,9 @@
           "description": "Standard list metadata. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds"
         }
       },
+      "required": [
+        "items"
+      ],
       "type": "object",
       "x-kubernetes-group-version-kind": [
         {
@@ -1194,6 +1203,9 @@
           "description": "Standard list metadata. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds"
         }
       },
+      "required": [
+        "items"
+      ],
       "type": "object",
       "x-kubernetes-group-version-kind": [
         {
@@ -1609,6 +1621,9 @@
           "description": "Standard list metadata. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds"
         }
       },
+      "required": [
+        "items"
+      ],
       "type": "object",
       "x-kubernetes-group-version-kind": [
         {
@@ -1667,6 +1682,9 @@
           "description": "Standard list metadata. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds"
         }
       },
+      "required": [
+        "items"
+      ],
       "type": "object",
       "x-kubernetes-group-version-kind": [
         {
diff --git a/api/openapi-spec/v3/apis__admissionregistration.k8s.io__v1_openapi.json b/api/openapi-spec/v3/apis__admissionregistration.k8s.io__v1_openapi.json
index b769eefeefd..5f6dcea273b 100644
--- a/api/openapi-spec/v3/apis__admissionregistration.k8s.io__v1_openapi.json
+++ b/api/openapi-spec/v3/apis__admissionregistration.k8s.io__v1_openapi.json
@@ -622,6 +622,9 @@
             "description": "Standard list metadata. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds"
           }
         },
+        "required": [
+          "items"
+        ],
         "type": "object",
         "x-kubernetes-group-version-kind": [
           {
@@ -699,6 +702,9 @@
             "description": "Standard list metadata. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds"
           }
         },
+        "required": [
+          "items"
+        ],
         "type": "object",
         "x-kubernetes-group-version-kind": [
           {
diff --git a/api/openapi-spec/v3/apis__admissionregistration.k8s.io__v1alpha1_openapi.json b/api/openapi-spec/v3/apis__admissionregistration.k8s.io__v1alpha1_openapi.json
index 88173bb8968..46a568be5fb 100644
--- a/api/openapi-spec/v3/apis__admissionregistration.k8s.io__v1alpha1_openapi.json
+++ b/api/openapi-spec/v3/apis__admissionregistration.k8s.io__v1alpha1_openapi.json
@@ -350,6 +350,9 @@
             "description": "Standard list metadata. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds"
           }
         },
+        "required": [
+          "items"
+        ],
         "type": "object",
         "x-kubernetes-group-version-kind": [
           {
@@ -427,6 +430,9 @@
             "description": "Standard list metadata. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds"
           }
         },
+        "required": [
+          "items"
+        ],
         "type": "object",
         "x-kubernetes-group-version-kind": [
           {
diff --git a/api/openapi-spec/v3/apis__admissionregistration.k8s.io__v1beta1_openapi.json b/api/openapi-spec/v3/apis__admissionregistration.k8s.io__v1beta1_openapi.json
index ead9b882f56..2bd667a4fdb 100644
--- a/api/openapi-spec/v3/apis__admissionregistration.k8s.io__v1beta1_openapi.json
+++ b/api/openapi-spec/v3/apis__admissionregistration.k8s.io__v1beta1_openapi.json
@@ -351,6 +351,9 @@
             "description": "Standard list metadata. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds"
           }
         },
+        "required": [
+          "items"
+        ],
         "type": "object",
         "x-kubernetes-group-version-kind": [
           {
@@ -428,6 +431,9 @@
             "description": "Standard list metadata. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds"
           }
         },
+        "required": [
+          "items"
+        ],
         "type": "object",
         "x-kubernetes-group-version-kind": [
           {
diff --git a/pkg/generated/openapi/zz_generated.openapi.go b/pkg/generated/openapi/zz_generated.openapi.go
index de1e5bb54dd..d946c42c3a9 100644
--- a/pkg/generated/openapi/zz_generated.openapi.go
+++ b/pkg/generated/openapi/zz_generated.openapi.go
@@ -2247,6 +2247,7 @@ func schema_k8sio_api_admissionregistration_v1_ValidatingAdmissionPolicyBindingL
 						},
 					},
 				},
+				Required: []string{"items"},
 			},
 		},
 		Dependencies: []string{
@@ -2352,6 +2353,7 @@ func schema_k8sio_api_admissionregistration_v1_ValidatingAdmissionPolicyList(ref
 						},
 					},
 				},
+				Required: []string{"items"},
 			},
 		},
 		Dependencies: []string{
@@ -3434,6 +3436,7 @@ func schema_k8sio_api_admissionregistration_v1alpha1_ValidatingAdmissionPolicyBi
 						},
 					},
 				},
+				Required: []string{"items"},
 			},
 		},
 		Dependencies: []string{
@@ -3539,6 +3542,7 @@ func schema_k8sio_api_admissionregistration_v1alpha1_ValidatingAdmissionPolicyLi
 						},
 					},
 				},
+				Required: []string{"items"},
 			},
 		},
 		Dependencies: []string{
@@ -4628,6 +4632,7 @@ func schema_k8sio_api_admissionregistration_v1beta1_ValidatingAdmissionPolicyBin
 						},
 					},
 				},
+				Required: []string{"items"},
 			},
 		},
 		Dependencies: []string{
@@ -4733,6 +4738,7 @@ func schema_k8sio_api_admissionregistration_v1beta1_ValidatingAdmissionPolicyLis
 						},
 					},
 				},
+				Required: []string{"items"},
 			},
 		},
 		Dependencies: []string{
diff --git a/staging/src/k8s.io/api/admissionregistration/v1/types.go b/staging/src/k8s.io/api/admissionregistration/v1/types.go
index 0510712b246..b9ce1f0335c 100644
--- a/staging/src/k8s.io/api/admissionregistration/v1/types.go
+++ b/staging/src/k8s.io/api/admissionregistration/v1/types.go
@@ -203,7 +203,7 @@ type ValidatingAdmissionPolicyList struct {
 	// +optional
 	metav1.ListMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`
 	// List of ValidatingAdmissionPolicy.
-	Items []ValidatingAdmissionPolicy `json:"items,omitempty" protobuf:"bytes,2,rep,name=items"`
+	Items []ValidatingAdmissionPolicy `json:"items" protobuf:"bytes,2,rep,name=items"`
 }
 
 // ValidatingAdmissionPolicySpec is the specification of the desired behavior of the AdmissionPolicy.
@@ -464,7 +464,7 @@ type ValidatingAdmissionPolicyBindingList struct {
 	// +optional
 	metav1.ListMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`
 	// List of PolicyBinding.
-	Items []ValidatingAdmissionPolicyBinding `json:"items,omitempty" protobuf:"bytes,2,rep,name=items"`
+	Items []ValidatingAdmissionPolicyBinding `json:"items" protobuf:"bytes,2,rep,name=items"`
 }
 
 // ValidatingAdmissionPolicyBindingSpec is the specification of the ValidatingAdmissionPolicyBinding.
diff --git a/staging/src/k8s.io/api/admissionregistration/v1alpha1/types.go b/staging/src/k8s.io/api/admissionregistration/v1alpha1/types.go
index bd6b17e1588..78d918bc72f 100644
--- a/staging/src/k8s.io/api/admissionregistration/v1alpha1/types.go
+++ b/staging/src/k8s.io/api/admissionregistration/v1alpha1/types.go
@@ -142,7 +142,7 @@ type ValidatingAdmissionPolicyList struct {
 	// +optional
 	metav1.ListMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`
 	// List of ValidatingAdmissionPolicy.
-	Items []ValidatingAdmissionPolicy `json:"items,omitempty" protobuf:"bytes,2,rep,name=items"`
+	Items []ValidatingAdmissionPolicy `json:"items" protobuf:"bytes,2,rep,name=items"`
 }
 
 // ValidatingAdmissionPolicySpec is the specification of the desired behavior of the AdmissionPolicy.
@@ -404,7 +404,7 @@ type ValidatingAdmissionPolicyBindingList struct {
 	// +optional
 	metav1.ListMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`
 	// List of PolicyBinding.
-	Items []ValidatingAdmissionPolicyBinding `json:"items,omitempty" protobuf:"bytes,2,rep,name=items"`
+	Items []ValidatingAdmissionPolicyBinding `json:"items" protobuf:"bytes,2,rep,name=items"`
 }
 
 // ValidatingAdmissionPolicyBindingSpec is the specification of the ValidatingAdmissionPolicyBinding.
diff --git a/staging/src/k8s.io/api/admissionregistration/v1beta1/types.go b/staging/src/k8s.io/api/admissionregistration/v1beta1/types.go
index cf1e29a6cab..0f590312392 100644
--- a/staging/src/k8s.io/api/admissionregistration/v1beta1/types.go
+++ b/staging/src/k8s.io/api/admissionregistration/v1beta1/types.go
@@ -158,7 +158,7 @@ type ValidatingAdmissionPolicyList struct {
 	// +optional
 	metav1.ListMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`
 	// List of ValidatingAdmissionPolicy.
-	Items []ValidatingAdmissionPolicy `json:"items,omitempty" protobuf:"bytes,2,rep,name=items"`
+	Items []ValidatingAdmissionPolicy `json:"items" protobuf:"bytes,2,rep,name=items"`
 }
 
 // ValidatingAdmissionPolicySpec is the specification of the desired behavior of the AdmissionPolicy.
@@ -419,7 +419,7 @@ type ValidatingAdmissionPolicyBindingList struct {
 	// +optional
 	metav1.ListMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`
 	// List of PolicyBinding.
-	Items []ValidatingAdmissionPolicyBinding `json:"items,omitempty" protobuf:"bytes,2,rep,name=items"`
+	Items []ValidatingAdmissionPolicyBinding `json:"items" protobuf:"bytes,2,rep,name=items"`
 }
 
 // ValidatingAdmissionPolicyBindingSpec is the specification of the ValidatingAdmissionPolicyBinding.