diff --git a/packages/clients/src/api/iam/v1alpha1/api.gen.ts b/packages/clients/src/api/iam/v1alpha1/api.gen.ts
index 8d044f608..6963a6e9d 100644
--- a/packages/clients/src/api/iam/v1alpha1/api.gen.ts
+++ b/packages/clients/src/api/iam/v1alpha1/api.gen.ts
@@ -28,6 +28,7 @@ import {
   marshalUpdateSSHKeyRequest,
   marshalUpdateUserPasswordRequest,
   marshalUpdateUserRequest,
+  marshalUpdateUserUsernameRequest,
   unmarshalAPIKey,
   unmarshalApplication,
   unmarshalEncodedJWT,
@@ -129,6 +130,7 @@ import type {
   UpdateSSHKeyRequest,
   UpdateUserPasswordRequest,
   UpdateUserRequest,
+  UpdateUserUsernameRequest,
   User,
 } from './types.gen'
 
@@ -355,6 +357,26 @@ export class API extends ParentAPI {
       unmarshalUser,
     )
 
+  /**
+   * Update an user's username. Private Beta feature.. Update an user's
+   * username. Private Beta feature.
+   *
+   * @param request - The request {@link UpdateUserUsernameRequest}
+   * @returns A Promise of User
+   */
+  updateUserUsername = (request: Readonly<UpdateUserUsernameRequest>) =>
+    this.client.fetch<User>(
+      {
+        body: JSON.stringify(
+          marshalUpdateUserUsernameRequest(request, this.client.settings),
+        ),
+        headers: jsonContentHeaders,
+        method: 'POST',
+        path: `/iam/v1alpha1/users/${validatePathParam('userId', request.userId)}/update-username`,
+      },
+      unmarshalUser,
+    )
+
   /**
    * Update an user's password. Private Beta feature.. Update an user's
    * password. Private Beta feature.
diff --git a/packages/clients/src/api/iam/v1alpha1/index.gen.ts b/packages/clients/src/api/iam/v1alpha1/index.gen.ts
index 68b33821c..d25177e5d 100644
--- a/packages/clients/src/api/iam/v1alpha1/index.gen.ts
+++ b/packages/clients/src/api/iam/v1alpha1/index.gen.ts
@@ -97,6 +97,7 @@ export type {
   UpdateSSHKeyRequest,
   UpdateUserPasswordRequest,
   UpdateUserRequest,
+  UpdateUserUsernameRequest,
   User,
   UserStatus,
   UserType,
diff --git a/packages/clients/src/api/iam/v1alpha1/marshalling.gen.ts b/packages/clients/src/api/iam/v1alpha1/marshalling.gen.ts
index a0d1539d8..1a1daba91 100644
--- a/packages/clients/src/api/iam/v1alpha1/marshalling.gen.ts
+++ b/packages/clients/src/api/iam/v1alpha1/marshalling.gen.ts
@@ -57,6 +57,7 @@ import type {
   UpdateSSHKeyRequest,
   UpdateUserPasswordRequest,
   UpdateUserRequest,
+  UpdateUserUsernameRequest,
   User,
 } from './types.gen'
 
@@ -761,3 +762,10 @@ export const marshalUpdateUserRequest = (
   email: request.email,
   tags: request.tags,
 })
+
+export const marshalUpdateUserUsernameRequest = (
+  request: UpdateUserUsernameRequest,
+  defaults: DefaultValues,
+): Record<string, unknown> => ({
+  username: request.username,
+})
diff --git a/packages/clients/src/api/iam/v1alpha1/types.gen.ts b/packages/clients/src/api/iam/v1alpha1/types.gen.ts
index 2cb4a8dc2..0aff51123 100644
--- a/packages/clients/src/api/iam/v1alpha1/types.gen.ts
+++ b/packages/clients/src/api/iam/v1alpha1/types.gen.ts
@@ -1156,3 +1156,10 @@ export type UpdateUserRequest = {
   /** IAM member email. */
   email?: string
 }
+
+export type UpdateUserUsernameRequest = {
+  /** ID of the user to update. */
+  userId: string
+  /** The new username. */
+  username: string
+}
diff --git a/packages/clients/src/api/iam/v1alpha1/validation-rules.gen.ts b/packages/clients/src/api/iam/v1alpha1/validation-rules.gen.ts
index faffb8884..057845334 100644
--- a/packages/clients/src/api/iam/v1alpha1/validation-rules.gen.ts
+++ b/packages/clients/src/api/iam/v1alpha1/validation-rules.gen.ts
@@ -261,3 +261,11 @@ export const UpdateUserPasswordRequest = {
     minLength: 1,
   },
 }
+
+export const UpdateUserUsernameRequest = {
+  username: {
+    maxLength: 64,
+    minLength: 2,
+    pattern: /^[a-zA-Z0-9._-]+$/,
+  },
+}