Transport Layer Security (TLS) is a critical security protocol used to protect web traffic. It provides confidentiality and integrity of data in transit between clients and servers exchanging information. As part of ongoing efforts to modernize platforms, and to improve security and reliability, TLS 1.0 and 1.1 have been deprecated by the Internet Engineering Task Force (IETF) as of March 25, 2021. These versions have been deprecated on Apple platforms as of iOS 15, iPadOS 15, macOS 12, watchOS 8, and tvOS 15, and support will be removed in future releases.

If your app has enabled App Transport Security (ATS) on all connections, no changes are required. If your app continues to use legacy TLS 1.0 or 1.1, please make plans to transition to TLS 1.2 or later. We recommend supporting TLS 1.3, as it’s faster and more secure. Make sure your web servers support the later versions and remove the following deprecated Security.framework symbols from your app:

• tls_protocol_version_t.TLSv10
• tls_protocol_version_t.TLSv11
• tls_protocol_version_t.DTLSv10