A new version (2.4.0) of the BLAST+ executables is now available.
The new version offers improved scoring for selenocysteine residues in the query and database sequences. It also improves performance for the BLASTP/BLASTX/TBLASTN programs by allowing multi-threaded calculation of the traceback . BLASTN has had this feature since the 2.2.29 release. The full release notes are here.
The new executables are available on the NCBI FTP site at ftp://ftp.ncbi.nlm.nih.gov/blast/executables/LATEST