diff --git a/changelogs/application_service/newsfragments/2132.clarification b/changelogs/application_service/newsfragments/2132.clarification
new file mode 100644
index 00000000..26f5d085
--- /dev/null
+++ b/changelogs/application_service/newsfragments/2132.clarification
@@ -0,0 +1 @@
+Declare the Application Service Registration schema to follow JSON Schema spec 2020-12.
\ No newline at end of file
diff --git a/data/api/application-service/definitions/namespace_list.yaml b/data/api/application-service/definitions/namespace_list.yaml
index 4f45fc3f..35f5d61a 100644
--- a/data/api/application-service/definitions/namespace_list.yaml
+++ b/data/api/application-service/definitions/namespace_list.yaml
@@ -11,6 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+$schema: https://json-schema.org/draft/2020-12/schema
 
 type: array
 items:
diff --git a/data/api/application-service/definitions/registration.yaml b/data/api/application-service/definitions/registration.yaml
index ce702df0..e7e15470 100644
--- a/data/api/application-service/definitions/registration.yaml
+++ b/data/api/application-service/definitions/registration.yaml
@@ -11,6 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+$schema: https://json-schema.org/draft/2020-12/schema
 
 type: object
 title: Registration