13.3
What's New
iOS 13.3 strengthens security by expanding HSTS enforcement to additional TLDs and introducing WebAuthn support for hardware security keys across Safari and authentication frameworks. These changes improve both app security posture and user authentication options on compatible devices, with development support provided through Xcode 11.3.
Highlights
- HSTS preload list expanded to include .dev and .app TLDs, enforcing HTTPS-only connections
- WebAuthn support added for FIDO2-compliant security keys via NFC, USB, and Lightning
- Enhanced Safari authentication with external security key support across multiple connection types
- Xcode 11.3 bundled with iOS 13.3 SDK for unified development environment