diff --git a/src/clients.ts b/src/clients.ts
index 0154ceb..cfd81cb 100644
--- a/src/clients.ts
+++ b/src/clients.ts
@@ -6,6 +6,7 @@ import { Client as BaseUserApi } from "./userapi.ts";
 
 interface AdminApiOptions {
   adminKey: string;
+  apiVersion?: string;
   baseUrl?: string;
 }
 
@@ -39,6 +40,10 @@ export class AdminApi extends BaseAdminApi {
     }
 
     const headers: Headers = new Headers();
+    headers.set(
+      constants.API_VERSION_HEADER,
+      options.apiVersion || constants.API_VERSION,
+    );
     headers.set(constants.AUTH_HEADER, "Bearer " + adminKey);
 
     super(new HttpTransport({ headers, baseUrl: options.baseUrl }));
@@ -48,6 +53,7 @@ export class AdminApi extends BaseAdminApi {
 interface UserApiOptions {
   userKey: string;
   accessToken?: string;
+  apiVersion?: string;
   baseUrl?: string;
 }
 
@@ -103,6 +109,10 @@ export class UserApi extends BaseUserApi {
     }
 
     const headers: Headers = new Headers();
+    headers.set(
+      constants.API_VERSION_HEADER,
+      options.apiVersion || constants.API_VERSION,
+    );
     headers.set(constants.API_KEY_HEADER, userKey);
     if (accessToken) {
       headers.set(constants.AUTH_HEADER, "Bearer " + accessToken);
diff --git a/src/internal/constants.ts b/src/internal/constants.ts
index 1f30cb0..b63d8ba 100644
--- a/src/internal/constants.ts
+++ b/src/internal/constants.ts
@@ -1,11 +1,13 @@
 // Code generated. DO NOT EDIT.
 
 export const API_BASE_URL = "https://api.userhub.com";
+export const API_VERSION = "2022-11-15";
 export const USER_AGENT = "UserHub-JavaScript/0.7.0";
 export const VERSION = "0.7.0";
 
 export const AUTH_HEADER = "Authorization";
 export const API_KEY_HEADER = "UserHub-Api-Key";
+export const API_VERSION_HEADER = "UserHub-Api-Version";
 
 export const WEBHOOK_ACTION_HEADER = "UserHub-Action";
 export const WEBHOOK_AGENT_HEADER = "Webhook-Agent";
diff --git a/test/node/basics.test.ts b/test/node/basics.test.ts
index 9f5ae2c..2c01433 100644
--- a/test/node/basics.test.ts
+++ b/test/node/basics.test.ts
@@ -75,6 +75,9 @@ test("API GET", async () => {
   expect(requests[0].method).equal("GET");
   expect(requests[0].url).equal("/admin/v1/users/usr_1");
   expect(requests[0].headers["accept"]).equal("application/json");
+  expect(requests[0].headers["userhub-api-version"]).equal(
+    constants.API_VERSION,
+  );
   expect(requests[0].headers["authorization"]).equal("Bearer sk_test");
   expect(requests[0].headers["content-type"]).toBeUndefined();
   expect(requests[0].headers["user-agent"]).equal(constants.USER_AGENT);
@@ -101,6 +104,9 @@ test("API POST", async () => {
   expect(requests[0].method).equal("POST");
   expect(requests[0].url).equal("/admin/v1/users");
   expect(requests[0].headers["accept"]).equal("application/json");
+  expect(requests[0].headers["userhub-api-version"]).equal(
+    constants.API_VERSION,
+  );
   expect(requests[0].headers["authorization"]).equal("Bearer sk_test");
   expect(requests[0].headers["content-type"]).equal("application/json");
   expect(requests[0].headers["user-agent"]).equal(constants.USER_AGENT);
@@ -128,6 +134,9 @@ test("API PATCH", async () => {
   expect(requests[0].method).equal("PATCH");
   expect(requests[0].url).equal("/admin/v1/users/usr_1?allowMissing=true");
   expect(requests[0].headers["accept"]).equal("application/json");
+  expect(requests[0].headers["userhub-api-version"]).equal(
+    constants.API_VERSION,
+  );
   expect(requests[0].headers["authorization"]).equal("Bearer sk_test");
   expect(requests[0].headers["content-type"]).equal("application/json");
   expect(requests[0].headers["user-agent"]).equal(constants.USER_AGENT);
@@ -158,6 +167,9 @@ test("API DELETE", async () => {
   expect(requests[0].method).equal("DELETE");
   expect(requests[0].url).equal("/admin/v1/users/usr_1");
   expect(requests[0].headers["accept"]).equal("application/json");
+  expect(requests[0].headers["userhub-api-version"]).equal(
+    constants.API_VERSION,
+  );
   expect(requests[0].headers["authorization"]).equal("Bearer sk_test");
   expect(requests[0].headers["content-type"]).toBeUndefined();
   expect(requests[0].headers["user-agent"]).equal(constants.USER_AGENT);