Apple has patched the exploit that made the evasi0n jailbreak possible with iOS 6.1.3 beta, says the evad3rs team.
According to the report, the latest iOS beta, patches a bug in the operating system’s timezone settings to make the jailbreak work. The report goes on to say that the team can still work through the current exploits, and maybe even start from scratch to build a new jailbreak if needed. The team worked to find enough holes to accomplish that, even if the current five exploits are covered (which one of those five already is).
Yup. That cat and mouse game between jailbreak teams and Apple continues.