https://wccftech.com/cydia-substrate-adds-ios-13-support-also-fixes-major-resource-leak/

If you're a fan of Jailbreak and have a dedicated device for the purpose, we have good news. That's right, Saurik has updated Cydia to support iOS 13. In addition to this, the update also fixes a “serious resource leak that would eventually cause Substrate to lock up and break.” If you have been waiting for the update to hit your jailbroken smartphones, be sure to update Cydia as soon as you can. Let's dive in to see some more details on the subject and what can you expect from the update.

The latest update carries the build 0.9.7100. If you're unfamiliar, Cydia Substrate is a tool used to inject tweaks in Unc0ver as well as Checkra1n jailbreak. The latter tool is used to jailbreak iOS 13 to iOS 13.3 which is supported by devices ranging from iPhone 5s to iPhone X. Henceforth, the support is now expanding so users can derive further utility from the mix.