What version of VxWorks does the cRIO run?

Hi, this is a pretty basic question, but I couldn’t easily find it anywhere. What version of VxWorks does the cRIO run? I’ve heard it’s out-of-date because NI hasn’t updated, but I don’t know the actual version number.

6.3

Just for future reference - if you watch the robot boot, it displays all the versioning info for VxWorks when it first comes up.