---
title: SSLProtocol.tlsProtocol13
framework: security
role: symbol
role_heading: Case
path: security/sslprotocol/tlsprotocol13
---

# SSLProtocol.tlsProtocol13

Specifies that the TLS 1.3 protocol is preferred but lower versions may be negotiated.

## Declaration

```swift
case tlsProtocol13
```