On June 30th, 2026, Vercel will remove support for the legacy DHE-RSA-AES256-GCM-SHA384 cipher suite.

This cipher may still be used by automated systems, security scanners, and HTTP clients with non-standard TLS configurations.

After this date, clients using TLS 1.2 will only be able to connect to the Vercel network with our six remaining cipher suites:

• ECDHE-ECDSA-AES128-GCM-SHA256

• ECDHE-RSA-AES128-GCM-SHA256

• ECDHE-ECDSA-AES256-GCM-SHA384

• ECDHE-RSA-AES256-GCM-SHA384

• ECDHE-ECDSA-CHACHA20-POLY1305

• ECDHE-RSA-CHACHA20-POLY1305

Modern clients and TLS 1.3 connections are unaffected.

If you operate integrations or automated systems that connect to a domain hosted on Vercel over TLS 1.2, verify that your TLS client supports at least one of the above cipher suites. Modern TLS libraries support these by default.