Update to version 0.2.4.22 which solves these major and security problems:
Block authority signing keys that were used on authorities vulnerable to the "heartbleed" bug in OpenSSL (CVE-2014-0160).
Fix a memory leak that could occur if a microdescriptor parse fails during the tokenizing step.
The relay ciphersuite list is now generated automatically based on uniform criteria, and includes all OpenSSL ciphersuites with acceptable strength and forward secrecy.
Relays now trust themselves to have a better view than clients of which TLS ciphersuites are better than others.
Clients now try to advertise the same list of ciphersuites as Firefox 28.
For other changes see the upstream change log