Security Update 2015-002 Yosemite (Early 2015 Mac)
Security Update 2015-002 is recommended for all users and improves the security of OS X.
For detailed information about the security content of this update, please visit: http://support.apple.com/kb/HT1222
See http://support.apple.com/kb/HT5044 article for details on how to verify the authenticity of this download.