https://www.snort.org/downloads in the Latest Release section.
2013-09-12 - Snort 2.9.5.5[*] Improvements* Address issue with SMTP preprocessor and the ignore_tls_data configuration to correctly stop inspection after an SMTP session is encrypted. (Thanks Bram!)
* Disable all rule evaluation (as opposed to just rules with fast patterns) for packets on a previously blocked session.* Corrected when perfmon preprocessor writes stats to occur as soon as both the time and packet count criteria are met.* Enforce same restrictions on relative PCRE for HTTP buffers from shared library rules as already existed with text rules.Please submit bugs, questions, and feedback to bugs@snort.org.
Happy Snorting!
The Snort Release Team