Twilio end-user certificates for all REST API endpoints will be rotated on September 9, 2026

On September 9, 2026, Twilio will rotate the end-user TLS certificate for all REST API endpoints. Only the end-user certificate and certificate serial number will be renewed; root and intermediate certificates will remain the same.

This is a routine update that won’t impact most customers unless they’re pinning certificates or are managing them manually. Customers using the Twilio Helper Libraries don’t need to take any action since the change will be handled automatically. 

Twilio recommends against certificate pinning because it creates potential security risks, can cause downtimes for services, and a higher probability of failed API requests.

How to test your connection

The new certificate will be available for testing at https://tls-test.twilio.com starting August 12, 2026. If the request succeeds with a 200 OK, no further action is required.

Need a hand?

These resources have more detail:

• Monitoring Updates to Twilio REST API Security Settings

• Security best practices