diff --git a/common/api-review/vertexai.api.md b/common/api-review/vertexai.api.md
index 041bc62451f..10337b453f8 100644
--- a/common/api-review/vertexai.api.md
+++ b/common/api-review/vertexai.api.md
@@ -9,6 +9,12 @@ import { FirebaseApp } from '@firebase/app';
 import { FirebaseAuthTokenData } from '@firebase/auth-interop-types';
 import { FirebaseError } from '@firebase/util';
 
+// @public
+export enum ApiVersion {
+    V1 = "v1",
+    V1BETA = "v1beta"
+}
+
 // @public
 export class ArraySchema extends Schema {
     constructor(schemaParams: SchemaParams, items: TypedSchema);
@@ -505,6 +511,7 @@ export interface PromptFeedback {
 
 // @public
 export interface RequestOptions {
+    apiVersion?: ApiVersion;
     baseUrl?: string;
     timeout?: number;
 }
diff --git a/docs-devsite/vertexai.md b/docs-devsite/vertexai.md
index d9e26eabc5d..c347e312d27 100644
--- a/docs-devsite/vertexai.md
+++ b/docs-devsite/vertexai.md
@@ -40,6 +40,7 @@ The Vertex AI in Firebase Web SDK.
 
 |  Enumeration | Description |
 |  --- | --- |
+|  [ApiVersion](./vertexai.md#apiversion) | API versions for the Vertex AI in Firebase endpoint. |
 |  [BlockReason](./vertexai.md#blockreason) | Reason that a prompt was blocked. |
 |  [FinishReason](./vertexai.md#finishreason) | Reason that a candidate finished. |
 |  [FunctionCallingMode](./vertexai.md#functioncallingmode) |  |
@@ -217,6 +218,23 @@ A type that includes all specific Schema types.
 export type TypedSchema = IntegerSchema | NumberSchema | StringSchema | BooleanSchema | ObjectSchema | ArraySchema;
 ```
 
+## ApiVersion
+
+API versions for the Vertex AI in Firebase endpoint.
+
+<b>Signature:</b>
+
+```typescript
+export declare enum ApiVersion 
+```
+
+## Enumeration Members
+
+|  Member | Value | Description |
+|  --- | --- | --- |
+|  V1 | <code>&quot;v1&quot;</code> | The stable channel for version 1 of the API. |
+|  V1BETA | <code>&quot;v1beta&quot;</code> | The beta channel for version 1 of the API. |
+
 ## BlockReason
 
 Reason that a prompt was blocked.
diff --git a/docs-devsite/vertexai.requestoptions.md b/docs-devsite/vertexai.requestoptions.md
index 6d074775520..d40becc345d 100644
--- a/docs-devsite/vertexai.requestoptions.md
+++ b/docs-devsite/vertexai.requestoptions.md
@@ -22,9 +22,20 @@ export interface RequestOptions
 
 |  Property | Type | Description |
 |  --- | --- | --- |
+|  [apiVersion](./vertexai.requestoptions.md#requestoptionsapiversion) | [ApiVersion](./vertexai.md#apiversion) | API version for endpoint. Defaults to <code>"v1beta"</code> (<code>[ApiVersion.V1BETA](./vertexai.md#apiversionv1beta_enummember)</code>). |
 |  [baseUrl](./vertexai.requestoptions.md#requestoptionsbaseurl) | string | Base url for endpoint. Defaults to https://firebasevertexai.googleapis.com |
 |  [timeout](./vertexai.requestoptions.md#requestoptionstimeout) | number | Request timeout in milliseconds. Defaults to 180 seconds (180000ms). |
 
+## RequestOptions.apiVersion
+
+API version for endpoint. Defaults to <code>"v1beta"</code> (<code>[ApiVersion.V1BETA](./vertexai.md#apiversionv1beta_enummember)</code>).
+
+<b>Signature:</b>
+
+```typescript
+apiVersion?: ApiVersion;
+```
+
 ## RequestOptions.baseUrl
 
 Base url for endpoint. Defaults to https://firebasevertexai.googleapis.com
diff --git a/packages/vertexai/src/requests/request.test.ts b/packages/vertexai/src/requests/request.test.ts
index b6d0ecb9b71..79386758118 100644
--- a/packages/vertexai/src/requests/request.test.ts
+++ b/packages/vertexai/src/requests/request.test.ts
@@ -22,7 +22,7 @@ import chaiAsPromised from 'chai-as-promised';
 import { RequestUrl, Task, getHeaders, makeRequest } from './request';
 import { ApiSettings } from '../types/internal';
 import { DEFAULT_API_VERSION } from '../constants';
-import { VertexAIErrorCode } from '../types';
+import { ApiVersion, VertexAIErrorCode } from '../types';
 import { VertexAIError } from '../errors';
 import { getMockResponse } from '../../test-utils/mock-response';
 
@@ -74,6 +74,18 @@ describe('request methods', () => {
       );
       expect(url.toString()).to.include(DEFAULT_API_VERSION);
     });
+    it('custom apiVersion', async () => {
+      const url = new RequestUrl(
+        'models/model-name',
+        Task.GENERATE_CONTENT,
+        fakeApiSettings,
+        false,
+        { apiVersion: ApiVersion.V1 }
+      );
+      expect(url.toString()).to.include(ApiVersion.V1);
+      // TODO: Update test to set ApiVersion.V1BETA when ApiVersion.V1 becomes the default.
+      expect(ApiVersion.V1).to.not.equal(DEFAULT_API_VERSION);
+    });
     it('custom baseUrl', async () => {
       const url = new RequestUrl(
         'models/model-name',
diff --git a/packages/vertexai/src/requests/request.ts b/packages/vertexai/src/requests/request.ts
index f81b40635e3..991a82b18df 100644
--- a/packages/vertexai/src/requests/request.ts
+++ b/packages/vertexai/src/requests/request.ts
@@ -42,8 +42,7 @@ export class RequestUrl {
     public requestOptions?: RequestOptions
   ) {}
   toString(): string {
-    // TODO: allow user-set option if that feature becomes available
-    const apiVersion = DEFAULT_API_VERSION;
+    const apiVersion = this.requestOptions?.apiVersion || DEFAULT_API_VERSION;
     const baseUrl = this.requestOptions?.baseUrl || DEFAULT_BASE_URL;
     let url = `${baseUrl}/${apiVersion}`;
     url += `/projects/${this.apiSettings.project}`;
diff --git a/packages/vertexai/src/types/enums.ts b/packages/vertexai/src/types/enums.ts
index 3e66bacc612..db1361b4c0b 100644
--- a/packages/vertexai/src/types/enums.ts
+++ b/packages/vertexai/src/types/enums.ts
@@ -27,6 +27,17 @@ export type Role = (typeof POSSIBLE_ROLES)[number];
  */
 export const POSSIBLE_ROLES = ['user', 'model', 'function', 'system'] as const;
 
+/**
+ * API versions for the Vertex AI in Firebase endpoint.
+ * @public
+ */
+export enum ApiVersion {
+  /** The stable channel for version 1 of the API. */
+  V1 = 'v1',
+  /** The beta channel for version 1 of the API. */
+  V1BETA = 'v1beta'
+}
+
 /**
  * Harm categories that would cause prompts or candidates to be blocked.
  * @public
diff --git a/packages/vertexai/src/types/requests.ts b/packages/vertexai/src/types/requests.ts
index dc7576f232d..235c9df13c1 100644
--- a/packages/vertexai/src/types/requests.ts
+++ b/packages/vertexai/src/types/requests.ts
@@ -18,6 +18,7 @@
 import { TypedSchema } from '../requests/schema-builder';
 import { Content, Part } from './content';
 import {
+  ApiVersion,
   FunctionCallingMode,
   HarmBlockMethod,
   HarmBlockThreshold,
@@ -129,6 +130,11 @@ export interface RequestOptions {
    * Base url for endpoint. Defaults to https://firebasevertexai.googleapis.com
    */
   baseUrl?: string;
+  /**
+   * API version for endpoint. Defaults to <code>"v1beta"</code>
+   * (<code>{@link ApiVersion.V1BETA}</code>).
+   */
+  apiVersion?: ApiVersion;
 }
 
 /**