diff --git a/sdk/cosmosdb/arm-cosmosdb/src/cosmosDBManagementClientContext.ts b/sdk/cosmosdb/arm-cosmosdb/src/cosmosDBManagementClientContext.ts
index cb6b851a6558..9f445d3dc4e3 100644
--- a/sdk/cosmosdb/arm-cosmosdb/src/cosmosDBManagementClientContext.ts
+++ b/sdk/cosmosdb/arm-cosmosdb/src/cosmosDBManagementClientContext.ts
@@ -36,14 +36,14 @@ export class CosmosDBManagementClientContext extends msRestAzure.AzureServiceCli
     if (!options) {
       options = {};
     }
-    if (!options.userAgent) {
+    if(!options.userAgent) {
       const defaultUserAgent = msRestAzure.getDefaultUserAgentValue();
       options.userAgent = `${packageName}/${packageVersion} ${defaultUserAgent}`;
     }
 
     super(credentials, options);
 
-    this.apiVersion = '2021-01-15';
+    this.apiVersion = '2021-03-15';
     this.acceptLanguage = 'en-US';
     this.longRunningOperationRetryTimeout = 30;
     this.baseUri = options.baseUri || this.baseUri || "https://management.azure.com";
@@ -51,10 +51,10 @@ export class CosmosDBManagementClientContext extends msRestAzure.AzureServiceCli
     this.credentials = credentials;
     this.subscriptionId = subscriptionId;
 
-    if (options.acceptLanguage !== null && options.acceptLanguage !== undefined) {
+    if(options.acceptLanguage !== null && options.acceptLanguage !== undefined) {
       this.acceptLanguage = options.acceptLanguage;
     }
-    if (options.longRunningOperationRetryTimeout !== null && options.longRunningOperationRetryTimeout !== undefined) {
+    if(options.longRunningOperationRetryTimeout !== null && options.longRunningOperationRetryTimeout !== undefined) {
       this.longRunningOperationRetryTimeout = options.longRunningOperationRetryTimeout;
     }
   }
diff --git a/sdk/cosmosdb/arm-cosmosdb/src/models/index.ts b/sdk/cosmosdb/arm-cosmosdb/src/models/index.ts
index c250f6f488df..bd439e91a6d9 100644
--- a/sdk/cosmosdb/arm-cosmosdb/src/models/index.ts
+++ b/sdk/cosmosdb/arm-cosmosdb/src/models/index.ts
@@ -433,6 +433,12 @@ export interface DatabaseAccountGetResults extends ARMResourceProperties {
    * The URI of the key vault
    */
   keyVaultKeyUri?: string;
+  /**
+   * The default identity for accessing key vault used in features like customer managed keys. The
+   * default identity needs to be explicitly set by the users. It can be "FirstPartyIdentity",
+   * "SystemAssignedIdentity" and more.
+   */
+  defaultIdentity?: string;
   /**
    * Whether requests from Public Network are allowed. Possible values include: 'Enabled',
    * 'Disabled'
@@ -1557,6 +1563,12 @@ export interface DatabaseAccountCreateUpdateParameters extends ARMResourceProper
    * The URI of the key vault
    */
   keyVaultKeyUri?: string;
+  /**
+   * The default identity for accessing key vault used in features like customer managed keys. The
+   * default identity needs to be explicitly set by the users. It can be "FirstPartyIdentity",
+   * "SystemAssignedIdentity" and more.
+   */
+  defaultIdentity?: string;
   /**
    * Whether requests from Public Network are allowed. Possible values include: 'Enabled',
    * 'Disabled'
@@ -1655,6 +1667,12 @@ export interface DatabaseAccountUpdateParameters {
    * The URI of the key vault
    */
   keyVaultKeyUri?: string;
+  /**
+   * The default identity for accessing key vault used in features like customer managed keys. The
+   * default identity needs to be explicitly set by the users. It can be "FirstPartyIdentity",
+   * "SystemAssignedIdentity" and more.
+   */
+  defaultIdentity?: string;
   /**
    * Whether requests from Public Network are allowed. Possible values include: 'Enabled',
    * 'Disabled'
diff --git a/sdk/cosmosdb/arm-cosmosdb/src/models/mappers.ts b/sdk/cosmosdb/arm-cosmosdb/src/models/mappers.ts
index 17bb1eb9e8d5..e3c964010fe5 100644
--- a/sdk/cosmosdb/arm-cosmosdb/src/models/mappers.ts
+++ b/sdk/cosmosdb/arm-cosmosdb/src/models/mappers.ts
@@ -714,6 +714,12 @@ export const DatabaseAccountGetResults: msRest.CompositeMapper = {
           name: "String"
         }
       },
+      defaultIdentity: {
+        serializedName: "properties.defaultIdentity",
+        type: {
+          name: "String"
+        }
+      },
       publicNetworkAccess: {
         serializedName: "properties.publicNetworkAccess",
         type: {
@@ -2708,6 +2714,12 @@ export const DatabaseAccountCreateUpdateParameters: msRest.CompositeMapper = {
           name: "String"
         }
       },
+      defaultIdentity: {
+        serializedName: "properties.defaultIdentity",
+        type: {
+          name: "String"
+        }
+      },
       publicNetworkAccess: {
         serializedName: "properties.publicNetworkAccess",
         type: {
@@ -2904,6 +2916,12 @@ export const DatabaseAccountUpdateParameters: msRest.CompositeMapper = {
           name: "String"
         }
       },
+      defaultIdentity: {
+        serializedName: "properties.defaultIdentity",
+        type: {
+          name: "String"
+        }
+      },
       publicNetworkAccess: {
         serializedName: "properties.publicNetworkAccess",
         type: {