diff --git a/.changeset/lucky-showers-guess.md b/.changeset/lucky-showers-guess.md
new file mode 100644
index 00000000000..3a21df15d8d
--- /dev/null
+++ b/.changeset/lucky-showers-guess.md
@@ -0,0 +1,5 @@
+---
+'@clerk/clerk-js': patch
+---
+
+Update active context cookie to properly set `Secure` attribute.
diff --git a/packages/clerk-js/src/core/auth/AuthCookieService.ts b/packages/clerk-js/src/core/auth/AuthCookieService.ts
index 6cbdd8207e7..932b639b1ba 100644
--- a/packages/clerk-js/src/core/auth/AuthCookieService.ts
+++ b/packages/clerk-js/src/core/auth/AuthCookieService.ts
@@ -1,6 +1,6 @@
 import type { createClerkEventBus } from '@clerk/shared/clerkEventBus';
 import { clerkEvents } from '@clerk/shared/clerkEventBus';
-import { createCookieHandler } from '@clerk/shared/cookie';
+import type { createCookieHandler } from '@clerk/shared/cookie';
 import { setDevBrowserJWTInURL } from '@clerk/shared/devBrowser';
 import { is4xxError, isClerkAPIResponseError, isClerkRuntimeError, isNetworkError } from '@clerk/shared/error';
 import { noop } from '@clerk/shared/utils';
@@ -9,6 +9,7 @@ import type { Clerk, InstanceType } from '@clerk/types';
 import { clerkMissingDevBrowserJwt } from '../errors';
 import { eventBus, events } from '../events';
 import type { FapiClient } from '../fapiClient';
+import { createActiveContextCookie } from './cookies/activeContext';
 import type { ClientUatCookieHandler } from './cookies/clientUat';
 import { createClientUatCookie } from './cookies/clientUat';
 import type { SessionCookieHandler } from './cookies/session';
@@ -75,7 +76,7 @@ export class AuthCookieService {
 
     this.clientUat = createClientUatCookie(cookieSuffix);
     this.sessionCookie = createSessionCookie(cookieSuffix);
-    this.activeCookie = createCookieHandler('clerk_active_context');
+    this.activeCookie = createActiveContextCookie();
     this.devBrowser = createDevBrowser({
       frontendApi: clerk.frontendApi,
       fapiClient,
@@ -84,10 +85,6 @@ export class AuthCookieService {
   }
 
   public async setup() {
-    // Cleanup old cookie
-    // TODO: This should be removed after 2025-08-01
-    createCookieHandler('clerk_active_org').remove();
-
     if (this.instanceType === 'production') {
       return this.setupProduction();
     } else {
diff --git a/packages/clerk-js/src/core/auth/cookies/activeContext.ts b/packages/clerk-js/src/core/auth/cookies/activeContext.ts
new file mode 100644
index 00000000000..36dea5b4339
--- /dev/null
+++ b/packages/clerk-js/src/core/auth/cookies/activeContext.ts
@@ -0,0 +1,20 @@
+import { createCookieHandler } from '@clerk/shared/cookie';
+
+import { getSecureAttribute } from '../getSecureAttribute';
+
+export const createActiveContextCookie = () => {
+  const handler = createCookieHandler('clerk_active_context');
+  const attributes = { secure: getSecureAttribute('None') };
+
+  return {
+    set: (value: string) => {
+      handler.set(value, attributes);
+    },
+    get: () => {
+      return handler.get();
+    },
+    remove: () => {
+      return handler.remove(attributes);
+    },
+  };
+};