diff --git a/packages/core/src/caches/well-known.ts b/packages/core/src/caches/well-known.ts
index 68bd31bcd..5c578c056 100644
--- a/packages/core/src/caches/well-known.ts
+++ b/packages/core/src/caches/well-known.ts
@@ -59,8 +59,9 @@ function getValueGuard(type: WellKnownCacheType): ZodType<WellKnownMap[typeof ty
 
 /**
  * A reusable cache for well-known data. The name "well-known" has no direct relation to the `.well-known` routes,
- * but indicates the data to store should be publicly viewable. You should never store any data that is protected
- * by any authentication method.
+ * but indicates the data to store should be publicly viewable.
+ *
+ * **CAUTION** You should never store any data that is protected by any authentication method.
  *
  * For better code maintainability, we recommend to use the cache for database queries only unless you have a strong
  * reason.
@@ -85,6 +86,7 @@ export class WellKnownCache {
     key: string
   ): Promise<Optional<WellKnownMap[Type]>> {
     const data = await this.cacheStore.get(this.cacheKey(type, key));
+
     return trySafe(() => getValueGuard(type).parse(JSON.parse(data ?? '')));
   }
 
diff --git a/packages/integration-tests/src/tests/api/well-known.test.ts b/packages/integration-tests/src/tests/api/well-known.test.ts
index 388f543c4..6386a599c 100644
--- a/packages/integration-tests/src/tests/api/well-known.test.ts
+++ b/packages/integration-tests/src/tests/api/well-known.test.ts
@@ -1,7 +1,6 @@
-import type { SignInExperience } from '@logto/schemas';
+import type { SignInExperience, Translation } from '@logto/schemas';
 
-import { adminTenantApi } from '#src/api/api.js';
-import { api } from '#src/api/index.js';
+import api, { adminTenantApi, authedAdminApi } from '#src/api/api.js';
 
 describe('.well-known api', () => {
   it('get /.well-known/sign-in-exp for console', async () => {
@@ -27,10 +26,19 @@ describe('.well-known api', () => {
     });
   });
 
-  it('get /.well-known/sign-in-exp for general app', async () => {
-    const response = await api.get('.well-known/sign-in-exp').json<SignInExperience>();
+  // Also test for Redis cache invalidation
+  it('should be able to return updated phrases', async () => {
+    const notification = 'Big brother is watching you.';
+    const original = await api
+      .get('.well-known/phrases?lng=en')
+      .json<{ translation: Translation }>();
 
-    // Should support sign-in and register
-    expect(response).toMatchObject({ signInMode: 'SignInAndRegister' });
+    expect(original.translation.demo_app).not.toHaveProperty('notification', notification);
+
+    await authedAdminApi.put('custom-phrases/en', { json: { demo_app: { notification } } });
+    const updated = await api
+      .get('.well-known/phrases?lng=en')
+      .json<{ translation: Translation }>();
+    expect(updated.translation.demo_app).toHaveProperty('notification', notification);
   });
 });