diff --git a/js/packages/teams-ai/src/planners/AssistantsPlanner.spec.ts b/js/packages/teams-ai/src/planners/AssistantsPlanner.spec.ts
index 40a116844..10b47ed1a 100644
--- a/js/packages/teams-ai/src/planners/AssistantsPlanner.spec.ts
+++ b/js/packages/teams-ai/src/planners/AssistantsPlanner.spec.ts
@@ -53,7 +53,8 @@ describe('AssistantsPlanner', () => {
 
         const options: AssistantsPlannerOptions = {
             apiKey: 'test-key',
-            assistant_id: 'test-assistant-id'
+            assistant_id: 'test-assistant-id',
+            api_version: '2024-02-15'
         };
 
         planner = new AssistantsPlanner<TurnState>(options);
diff --git a/js/packages/teams-ai/src/planners/AssistantsPlanner.ts b/js/packages/teams-ai/src/planners/AssistantsPlanner.ts
index b6e4e5dd5..4ca211e87 100644
--- a/js/packages/teams-ai/src/planners/AssistantsPlanner.ts
+++ b/js/packages/teams-ai/src/planners/AssistantsPlanner.ts
@@ -68,6 +68,11 @@ export interface AssistantsPlannerOptions {
      * Defaults to 'conversation.assistants_state'.
      */
     assistants_state_variable?: string;
+
+    /**
+     * Optional. Version of the API being called. Default is '2024-02-15-preview'.
+     */
+    api_version?: string;
 }
 
 /**
@@ -92,6 +97,7 @@ export class AssistantsPlanner<TState extends TurnState = TurnState> implements
         this._options = {
             polling_interval: DEFAULT_POLLING_INTERVAL,
             assistants_state_variable: DEFAULT_ASSISTANTS_STATE_VARIABLE,
+            api_version: '2024-02-15-preview',
             ...options
         };
 
diff --git a/js/samples/04.ai-apps/d.assistants-mathBot/src/bot.ts b/js/samples/04.ai-apps/d.assistants-mathBot/src/bot.ts
index b5c3907ba..71bd1bf42 100644
--- a/js/samples/04.ai-apps/d.assistants-mathBot/src/bot.ts
+++ b/js/samples/04.ai-apps/d.assistants-mathBot/src/bot.ts
@@ -40,7 +40,8 @@ if (!process.env.ASSISTANT_ID) {
 const planner = new AssistantsPlanner({
     apiKey: apiKey,
     endpoint: endpoint,
-    assistant_id: process.env.ASSISTANT_ID!
+    assistant_id: process.env.ASSISTANT_ID!,
+    api_version: '2024-02-15-preview'
 });
 
 // Define storage and application
diff --git a/js/samples/04.ai-apps/e.assistants-orderBot/src/bot.ts b/js/samples/04.ai-apps/e.assistants-orderBot/src/bot.ts
index 1121751e2..0e818c22d 100644
--- a/js/samples/04.ai-apps/e.assistants-orderBot/src/bot.ts
+++ b/js/samples/04.ai-apps/e.assistants-orderBot/src/bot.ts
@@ -61,7 +61,8 @@ if (!process.env.ASSISTANT_ID) {
 const planner = new AssistantsPlanner({
     apiKey: apiKey,
     endpoint: endpoint,
-    assistant_id: process.env.ASSISTANT_ID ?? assistantId
+    assistant_id: process.env.ASSISTANT_ID ?? assistantId,
+    api_version: '2024-02-15-preview'
 });
 
 // Define storage and application