diff --git a/specification/containerregistry/data-plane/Azure.ContainerRegistry/preview/2019-08-15-preview/containerregistry.json b/specification/containerregistry/data-plane/Azure.ContainerRegistry/preview/2019-08-15-preview/containerregistry.json
index cb01665c8d96..e1809deb01f7 100644
--- a/specification/containerregistry/data-plane/Azure.ContainerRegistry/preview/2019-08-15-preview/containerregistry.json
+++ b/specification/containerregistry/data-plane/Azure.ContainerRegistry/preview/2019-08-15-preview/containerregistry.json
@@ -1289,15 +1289,6 @@
   },
   "definitions": {
     "RepositoryAttributes": {
-      "required": [
-      	"registry",
-        "imageName",
-        "createdTime",
-        "lastUpdateTime",
-        "manifestCount",
-        "tagCount",
-        "changeableAttributes"
-      ],
       "x-ms-client-name": "RepositoryProperties",
       "type": "object",
       "description": "Repository attributes",
@@ -1360,11 +1351,6 @@
       }
     },
     "TagList": {
-      "required": [
-      	"registry",
-        "imageName",
-        "tags"
-      ],
       "description": "List of tag details",
       "x-accessibility": "internal",
       "properties": {
@@ -1425,11 +1411,6 @@
       }
     },
     "TagAttributes": {
-      "required": [
-      	"registry",
-        "imageName",
-        "tag"
-      ],
       "x-ms-client-name": "ArtifactTagProperties",
       "description": "Tag attributes",
       "properties": {
@@ -1471,13 +1452,6 @@
       }
     },
     "TagAttributesBase": {
-      "required": [
-        "name",
-        "digest",
-        "createdTime",
-        "lastUpdateTime",
-        "changeableAttributes"
-      ],
       "description": "Tag attribute details",
       "x-accessibility": "internal",
       "properties": {
@@ -1819,9 +1793,6 @@
       }
     },
     "ManifestAttributes": {
-      "required": [
-        "manifest"
-      ],
       "x-ms-client-name": "ArtifactManifestProperties",
       "description": "Manifest attributes details",
       "properties": {
@@ -1869,11 +1840,6 @@
       }
     },
     "ManifestAttributesBase": {
-      "required": [
-        "digest",
-        "createdTime",
-        "lastUpdateTime"
-      ],
       "type": "object",
       "description": "Manifest details",
       "x-accessibility": "internal",
@@ -2294,11 +2260,6 @@
       }
     },
     "ManifestAttributes_manifest_references": {
-      "required": [
-        "digest",
-        "architecture",
-        "os"
-      ],
       "x-ms-client-name": "ArtifactManifestReference",
       "description": "Manifest attributes details",
       "properties": {
@@ -3090,4 +3051,4 @@
       "x-ms-skip-url-encoding": true
     }
   }
-}
\ No newline at end of file
+}